HELP disk failure

TrueNAS General
,
1

I have a Nas with Truenas SCALE since September. I have 3x12TB HDDs in RAIDZ1. Recently some of them looks like are failing.

I received these alerts on 31st of October

  1. Device: /dev/sdb [SAT], 8 Currently unreadable (pending) sectors.
  2. Device: /dev/sdb [SAT], 8 Offline uncorrectable sectors

and these today 19th of November:

  1. Device: /dev/sdc [SAT], 8 Currently unreadable (pending) sectors.
  2. Device: /dev/sdc [SAT], 8 Offline uncorrectable sectors.

But apart from these alerts nothing appears in the UI, no SMART error or anything else.

Should be worried about the disks failing? How can I diagnose the error? I really don’t know what to do, can someone help me solve the issue? Thank you

2 
smartctl -x /dev/sdb

smartctl -x /dev/sdc

will show you the detailed SMART results.

Could be the same disc that is failing since linux names the first disc that comes online “a”

EDIT: also what does

zpool status -v

show ?

3

/dev/sd? means not much. What is/are the serial number(s) of the drive or drives in question. I’m making a guess that it is the same drive having the issue.

Yes, you should replace a drive with offline uncorrectable errors, as it indicates the drive is failing. The Pending unreadable sectors indicates that a drive has sectors that it can’t read correctly, but it’s still attempting to correct them. If it continues or errors increase because pending sectors can’t be recovered, Truenas may offline the drive and degrade the Pool.

It is of my opinion which others may not completly agree to that you can do all the stuff people say do first like long smart tests, but it’s at the risk Truenas (zfs) will fail the disk at some point and offline it and therefore you are risking your data. It is better to just go ahead and change the drive out.

4

sda:

sudo smartctl -x /dev/sda

smartctl 7.4 2023-08-01 r5530 [x86_64-linux-6.12.15-production+truenas] (local build)
Copyright (C) 2002-23, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Device Model:     ST12000NM0127
Serial Number:    ZJV4A37N
LU WWN Device Id: 5 000c50 0b55ff089
Firmware Version: G005
User Capacity:    12,000,138,625,024 bytes [12.0 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    7200 rpm
Form Factor:      3.5 inches
Device is:        Not in smartctl database 7.3/5528
ATA Version is:   ACS-3 T13/2161-D revision 5
SATA Version is:  SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is:    Wed Nov 19 17:33:01 2025 CET
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
AAM feature is:   Unavailable
APM feature is:   Unavailable
Rd look-ahead is: Enabled
Write cache is:   Enabled
DSN feature is:   Unavailable
ATA Security is:  Disabled, frozen [SEC2], Master PW ID: 0xfffd
Wt Cache Reorder: Enabled

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

General SMART Values:
Offline data collection status:  (0x00) Offline data collection activity
                                        was never started.
                                        Auto Offline Data Collection: Disabled.
Self-test execution status:      (   0) The previous self-test routine completed
                                        without error or no self-test has ever 
                                        been run.
Total time to complete Offline 
data collection:                (  567) seconds.
Offline data collection
capabilities:                    (0x73) SMART execute Offline immediate.
                                        Auto Offline data collection on/off support.
                                        Suspend Offline collection upon new
                                        command.
                                        No Offline surface scan supported.
                                        Self-test supported.
                                        Conveyance Self-test supported.
                                        Selective Self-test supported.
SMART capabilities:            (0x0003) Saves SMART data before entering
                                        power-saving mode.
                                        Supports SMART auto save timer.
Error logging capability:        (0x01) Error logging supported.
                                        General Purpose Logging supported.
Short self-test routine 
recommended polling time:        (   1) minutes.
Extended self-test routine
recommended polling time:        (1083) minutes.
Conveyance self-test routine
recommended polling time:        (   2) minutes.
SCT capabilities:              (0x50bd) SCT Status supported.
                                        SCT Error Recovery Control supported.
                                        SCT Feature Control supported.
                                        SCT Data Table supported.

SMART Attributes Data Structure revision number: 10
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAGS    VALUE WORST THRESH FAIL RAW_VALUE
  1 Raw_Read_Error_Rate     POSR--   076   064   044    -    41261230
  3 Spin_Up_Time            PO----   091   090   000    -    0
  4 Start_Stop_Count        -O--CK   100   100   020    -    15
  5 Reallocated_Sector_Ct   PO--CK   100   100   010    -    320
  7 Seek_Error_Rate         POSR--   080   060   045    -    103624711
  9 Power_On_Hours          -O--CK   098   098   000    -    2388
 10 Spin_Retry_Count        PO--C-   100   100   097    -    0
 12 Power_Cycle_Count       -O--CK   100   100   020    -    15
184 End-to-End_Error        -O--CK   100   100   099    -    0
187 Reported_Uncorrect      -O--CK   090   090   000    -    10
188 Command_Timeout         -O--CK   100   100   000    -    0
190 Airflow_Temperature_Cel -O---K   073   045   040    -    27 (Min/Max 26/27)
192 Power-Off_Retract_Count -O--CK   100   100   000    -    87
193 Load_Cycle_Count        -O--CK   100   100   000    -    109
194 Temperature_Celsius     -O---K   027   055   000    -    27 (0 25 0 0 0)
195 Hardware_ECC_Recovered  -O-RC-   008   004   000    -    41261230
197 Current_Pending_Sector  -O--C-   100   100   000    -    0
198 Offline_Uncorrectable   ----C-   100   100   000    -    0
199 UDMA_CRC_Error_Count    -OSRCK   200   200   000    -    0
200 Multi_Zone_Error_Rate   PO---K   100   100   001    -    0
240 Head_Flying_Hours       ------   100   253   000    -    2377 (58 51 0)
241 Total_LBAs_Written      ------   100   253   000    -    17706733904
242 Total_LBAs_Read         ------   100   253   000    -    41928883564
                            ||||||_ K auto-keep
                            |||||__ C event count
                            ||||___ R error rate
                            |||____ S speed/performance
                            ||_____ O updated online
                            |______ P prefailure warning

General Purpose Log Directory Version 1
SMART           Log Directory Version 1 [multi-sector log support]
Address    Access  R/W   Size  Description
0x00       GPL,SL  R/O      1  Log Directory
0x01           SL  R/O      1  Summary SMART error log
0x02           SL  R/O      5  Comprehensive SMART error log
0x03       GPL     R/O      5  Ext. Comprehensive SMART error log
0x04       GPL     R/O    256  Device Statistics log
0x04       SL      R/O      8  Device Statistics log
0x06           SL  R/O      1  SMART self-test log
0x07       GPL     R/O      1  Extended self-test log
0x08       GPL     R/O      2  Power Conditions log
0x09           SL  R/W      1  Selective self-test log
0x0c       GPL     R/O   2048  Pending Defects log
0x10       GPL     R/O      1  NCQ Command Error log
0x11       GPL     R/O      1  SATA Phy Event Counters log
0x13       GPL     R/O      1  SATA NCQ Send and Receive log
0x15       GPL     R/W      1  Rebuild Assist log
0x21       GPL     R/O      1  Write stream error log
0x22       GPL     R/O      1  Read stream error log
0x24       GPL     R/O    768  Current Device Internal Status Data log
0x30       GPL,SL  R/O      9  IDENTIFY DEVICE data log
0x80-0x9f  GPL,SL  R/W     16  Host vendor specific log
0xa1       GPL,SL  VS      24  Device vendor specific log
0xa2       GPL     VS   16320  Device vendor specific log
0xa4       GPL,SL  VS     160  Device vendor specific log
0xa6       GPL     VS     192  Device vendor specific log
0xa8-0xa9  GPL,SL  VS     136  Device vendor specific log
0xab       GPL     VS       1  Device vendor specific log
0xad       GPL     VS      16  Device vendor specific log
0xaf       GPL,SL  VS       1  Device vendor specific log
0xbe-0xbf  GPL     VS   65535  Device vendor specific log
0xc1       GPL,SL  VS       8  Device vendor specific log
0xc3       GPL,SL  VS      32  Device vendor specific log
0xc9       GPL,SL  VS       8  Device vendor specific log
0xca       GPL,SL  VS      16  Device vendor specific log
0xd1       GPL     VS     336  Device vendor specific log
0xd2       GPL     VS   10000  Device vendor specific log
0xd4       GPL     VS    2048  Device vendor specific log
0xda       GPL,SL  VS       1  Device vendor specific log
0xe0       GPL,SL  R/W      1  SCT Command/Status
0xe1       GPL,SL  R/W      1  SCT Data Transfer

SMART Extended Comprehensive Error Log Version: 1 (5 sectors)
Device Error Count: 10
        CR     = Command Register
        FEATR  = Features Register
        COUNT  = Count (was: Sector Count) Register
        LBA_48 = Upper bytes of LBA High/Mid/Low Registers ]  ATA-8
        LH     = LBA High (was: Cylinder High) Register    ]   LBA
        LM     = LBA Mid (was: Cylinder Low) Register      ] Register
        LL     = LBA Low (was: Sector Number) Register     ]
        DV     = Device (was: Device/Head) Register
        DC     = Device Control Register
        ER     = Error register
        ST     = Status register
Powered_Up_Time is measured from power on, and printed as
DDd+hh:mm:SS.sss where DD=days, hh=hours, mm=minutes,
SS=sec, and sss=millisec. It "wraps" after 49.710 days.

Error 10 [9] occurred at disk power-on lifetime: 971 hours (40 days + 11 hours)
  When the command that caused the error occurred, the device was active or idle.

  After command completion occurred, registers were:
  ER -- ST COUNT  LBA_48  LH LM LL DV DC
  -- -- -- == -- == == == -- -- -- -- --
  40 -- 53 00 00 00 00 10 d0 8b 98 00 00  Error: UNC at LBA = 0x10d08b98 = 282102680

  Commands leading to the command that caused the error were:
  CR FEATR COUNT  LBA_48  LH LM LL DV DC  Powered_Up_Time  Command/Feature_Name
  -- == -- == -- == == == -- -- -- -- --  ---------------  --------------------
  60 00 00 00 60 00 01 80 0e 09 40 40 00     20:04:26.044  READ FPDMA QUEUED
  60 00 00 02 a0 00 00 10 d0 89 c8 40 00     20:04:26.044  READ FPDMA QUEUED
  47 00 00 00 01 00 00 00 00 06 30 a0 00     20:04:26.042  READ LOG DMA EXT
  47 00 00 00 01 00 00 00 00 00 30 a0 00     20:04:26.041  READ LOG DMA EXT
  47 00 00 00 01 00 00 00 00 00 00 a0 00     20:04:26.041  READ LOG DMA EXT

Error 9 [8] occurred at disk power-on lifetime: 971 hours (40 days + 11 hours)
  When the command that caused the error occurred, the device was active or idle.

  After command completion occurred, registers were:
  ER -- ST COUNT  LBA_48  LH LM LL DV DC
  -- -- -- == -- == == == -- -- -- -- --
  40 -- 53 00 00 00 00 10 d0 8b 90 00 00  Error: UNC at LBA = 0x10d08b90 = 282102672

  Commands leading to the command that caused the error were:
  CR FEATR COUNT  LBA_48  LH LM LL DV DC  Powered_Up_Time  Command/Feature_Name
  -- == -- == -- == == == -- -- -- -- --  ---------------  --------------------
  60 00 00 00 18 00 01 e6 b8 af 18 40 00     20:04:22.428  READ FPDMA QUEUED
  60 00 00 00 60 00 01 80 0e 09 40 40 00     20:04:22.428  READ FPDMA QUEUED
  60 00 00 02 a0 00 00 10 d0 89 c8 40 00     20:04:22.428  READ FPDMA QUEUED
  61 00 00 00 10 00 04 fb 68 6f a0 40 00     20:04:22.428  WRITE FPDMA QUEUED
  60 00 00 00 58 00 01 98 c3 d5 60 40 00     20:04:22.427  READ FPDMA QUEUED

Error 8 [7] occurred at disk power-on lifetime: 971 hours (40 days + 11 hours)
  When the command that caused the error occurred, the device was active or idle.

  After command completion occurred, registers were:
  ER -- ST COUNT  LBA_48  LH LM LL DV DC
  -- -- -- == -- == == == -- -- -- -- --
  40 -- 53 00 00 00 00 10 d0 8b 98 00 00  Error: WP at LBA = 0x10d08b98 = 282102680

  Commands leading to the command that caused the error were:
  CR FEATR COUNT  LBA_48  LH LM LL DV DC  Powered_Up_Time  Command/Feature_Name
  -- == -- == -- == == == -- -- -- -- --  ---------------  --------------------
  61 00 00 00 10 00 04 fb 68 6f a0 40 00     20:04:22.312  WRITE FPDMA QUEUED
  60 00 00 00 18 00 01 e6 b8 af 18 40 00     20:04:18.832  READ FPDMA QUEUED
  60 00 00 00 58 00 01 98 c3 d5 60 40 00     20:04:18.806  READ FPDMA QUEUED
  60 00 00 00 60 00 01 80 0e 09 40 40 00     20:04:18.770  READ FPDMA QUEUED
  60 00 00 02 a0 00 00 10 d0 89 c8 40 00     20:04:18.770  READ FPDMA QUEUED

Error 7 [6] occurred at disk power-on lifetime: 969 hours (40 days + 9 hours)
  When the command that caused the error occurred, the device was active or idle.

  After command completion occurred, registers were:
  ER -- ST COUNT  LBA_48  LH LM LL DV DC
  -- -- -- == -- == == == -- -- -- -- --
  40 -- 53 00 00 00 00 14 0f 9c 30 00 00  Error: UNC at LBA = 0x140f9c30 = 336567344

  Commands leading to the command that caused the error were:
  CR FEATR COUNT  LBA_48  LH LM LL DV DC  Powered_Up_Time  Command/Feature_Name
  -- == -- == -- == == == -- -- -- -- --  ---------------  --------------------
  60 00 00 00 48 00 01 95 15 2b 20 40 00     18:23:56.473  READ FPDMA QUEUED
  60 00 00 00 60 00 01 b2 69 bb e0 40 00     18:23:56.473  READ FPDMA QUEUED
  60 00 00 00 28 00 01 8a 72 f4 90 40 00     18:23:56.472  READ FPDMA QUEUED
  60 00 00 07 a0 00 00 14 0f 96 20 40 00     18:23:52.949  READ FPDMA QUEUED
  60 00 00 07 d0 00 00 14 0f 8e 50 40 00     18:23:52.911  READ FPDMA QUEUED

Error 6 [5] occurred at disk power-on lifetime: 969 hours (40 days + 9 hours)
  When the command that caused the error occurred, the device was active or idle.

  After command completion occurred, registers were:
  ER -- ST COUNT  LBA_48  LH LM LL DV DC
  -- -- -- == -- == == == -- -- -- -- --
  40 -- 53 00 00 00 00 14 02 b8 78 00 00  Error: WP at LBA = 0x1402b878 = 335722616

  Commands leading to the command that caused the error were:
  CR FEATR COUNT  LBA_48  LH LM LL DV DC  Powered_Up_Time  Command/Feature_Name
  -- == -- == -- == == == -- -- -- -- --  ---------------  --------------------
  61 00 00 00 10 00 04 fb 67 37 90 40 00     18:23:31.408  WRITE FPDMA QUEUED
  60 00 00 07 e0 00 00 14 02 b3 08 40 00     18:23:31.407  READ FPDMA QUEUED
  ea 00 00 00 00 00 00 00 00 00 00 a0 00     18:23:31.372  FLUSH CACHE EXT
  61 00 00 00 10 00 04 fb 67 37 80 40 00     18:23:31.002  WRITE FPDMA QUEUED
  60 00 00 00 48 00 00 14 02 b2 c0 40 00     18:23:31.000  READ FPDMA QUEUED

Error 5 [4] occurred at disk power-on lifetime: 969 hours (40 days + 9 hours)
  When the command that caused the error occurred, the device was active or idle.

  After command completion occurred, registers were:
  ER -- ST COUNT  LBA_48  LH LM LL DV DC
  -- -- -- == -- == == == -- -- -- -- --
  40 -- 53 00 00 00 00 11 64 ed 60 00 00  Error: UNC at LBA = 0x1164ed60 = 291827040

  Commands leading to the command that caused the error were:
  CR FEATR COUNT  LBA_48  LH LM LL DV DC  Powered_Up_Time  Command/Feature_Name
  -- == -- == -- == == == -- -- -- -- --  ---------------  --------------------
  60 00 00 00 58 00 01 b2 43 d9 80 40 00     18:22:57.313  READ FPDMA QUEUED
  60 00 00 00 58 00 01 d1 55 9f d0 40 00     18:22:57.313  READ FPDMA QUEUED
  61 00 00 00 10 00 04 fb 67 34 10 40 00     18:22:57.313  WRITE FPDMA QUEUED
  60 00 00 00 38 00 01 7c ee 41 50 40 00     18:22:57.313  READ FPDMA QUEUED
  60 00 00 00 10 00 01 7b 89 8c e0 40 00     18:22:57.313  READ FPDMA QUEUED

Error 4 [3] occurred at disk power-on lifetime: 969 hours (40 days + 9 hours)
  When the command that caused the error occurred, the device was active or idle.

  After command completion occurred, registers were:
  ER -- ST COUNT  LBA_48  LH LM LL DV DC
  -- -- -- == -- == == == -- -- -- -- --
  40 -- 53 00 00 00 00 11 64 d8 10 00 00  Error: UNC at LBA = 0x1164d810 = 291821584

  Commands leading to the command that caused the error were:
  CR FEATR COUNT  LBA_48  LH LM LL DV DC  Powered_Up_Time  Command/Feature_Name
  -- == -- == -- == == == -- -- -- -- --  ---------------  --------------------
  60 00 00 08 00 00 00 11 64 d5 90 40 00     18:22:48.182  READ FPDMA QUEUED
  61 00 00 00 10 00 04 fb 67 33 80 40 00     18:22:48.182  WRITE FPDMA QUEUED
  60 00 00 00 40 00 01 8b 79 e5 a0 40 00     18:22:48.181  READ FPDMA QUEUED
  60 00 00 00 40 00 01 d1 a0 33 d0 40 00     18:22:46.049  READ FPDMA QUEUED
  60 00 00 00 50 00 01 c5 83 2e 70 40 00     18:22:46.039  READ FPDMA QUEUED

Error 3 [2] occurred at disk power-on lifetime: 969 hours (40 days + 9 hours)
  When the command that caused the error occurred, the device was active or idle.

  After command completion occurred, registers were:
  ER -- ST COUNT  LBA_48  LH LM LL DV DC
  -- -- -- == -- == == == -- -- -- -- --
  40 -- 53 00 00 00 00 11 64 9d 08 00 00  Error: UNC at LBA = 0x11649d08 = 291806472

  Commands leading to the command that caused the error were:
  CR FEATR COUNT  LBA_48  LH LM LL DV DC  Powered_Up_Time  Command/Feature_Name
  -- == -- == -- == == == -- -- -- -- --  ---------------  --------------------
  60 00 00 00 08 00 01 c8 13 0e 80 40 00     18:22:41.831  READ FPDMA QUEUED
  60 00 00 00 38 00 01 7d 79 6b 90 40 00     18:22:41.831  READ FPDMA QUEUED
  60 00 00 08 00 00 00 11 64 95 90 40 00     18:22:38.276  READ FPDMA QUEUED
  60 00 00 01 80 00 04 5e 4f 35 80 40 00     18:22:38.218  READ FPDMA QUEUED
  60 00 00 01 80 00 04 5e 4f 31 80 40 00     18:22:38.217  READ FPDMA QUEUED

SMART Extended Self-test Log Version: 1 (1 sectors)
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Short offline       Completed without error       00%      2322         -
# 2  Extended offline    Completed without error       00%      2293         -
# 3  Short offline       Completed without error       00%      2154         -
# 4  Short offline       Completed without error       00%      1986         -
# 5  Short offline       Completed without error       00%      1818         -
# 6  Short offline       Completed without error       00%      1649         -
# 7  Extended offline    Completed without error       00%      1549         -
# 8  Short offline       Completed without error       00%      1481         -
# 9  Short offline       Completed without error       00%      1313         -
#10  Short offline       Completed without error       00%      1145         -
#11  Extended offline    Completed without error       00%       996         -
#12  Short offline       Completed without error       00%       977         -
#13  Extended offline    Aborted by host               90%       976         -
#14  Extended offline    Completed without error       00%       829         -
#15  Short offline       Completed without error       00%       809         -
#16  Short offline       Completed without error       00%       641         -
#17  Short offline       Completed without error       00%       477         -
#18  Short offline       Completed without error       00%       311         -
#19  Extended offline    Completed without error       00%        93         -

SMART Selective self-test log data structure revision number 1
 SPAN  MIN_LBA  MAX_LBA  CURRENT_TEST_STATUS
    1        0        0  Not_testing
    2        0        0  Not_testing
    3        0        0  Not_testing
    4        0        0  Not_testing
    5        0        0  Not_testing
Selective self-test flags (0x0):
  After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.

SCT Status Version:                  3
SCT Version (vendor specific):       522 (0x020a)
Device State:                        Active (0)
Current Temperature:                    27 Celsius
Power Cycle Min/Max Temperature:     26/27 Celsius
Lifetime    Min/Max Temperature:     25/55 Celsius
Under/Over Temperature Limit Count:   0/0
Vendor specific:
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 10 01 00 00 00 00 00 00 00 00 00 00 00 00

SCT Temperature History Version:     2
Temperature Sampling Period:         3 minutes
Temperature Logging Interval:        59 minutes
Min/Max recommended Temperature:     10/40 Celsius
Min/Max Temperature Limit:            5/60 Celsius
Temperature History Size (Index):    128 (21)

Index    Estimated Time   Temperature Celsius
  22    2025-11-14 12:04    28  *********
  23    2025-11-14 13:03    29  **********
 ...    ..(  2 skipped).    ..  **********
  26    2025-11-14 16:00    29  **********
  27    2025-11-14 16:59    28  *********
  28    2025-11-14 17:58    29  **********
  29    2025-11-14 18:57    29  **********
  30    2025-11-14 19:56    28  *********
  31    2025-11-14 20:55    28  *********
  32    2025-11-14 21:54    29  **********
  33    2025-11-14 22:53    33  **************
 ...    ..(  2 skipped).    ..  **************
  36    2025-11-15 01:50    33  **************
  37    2025-11-15 02:49    32  *************
 ...    ..(  6 skipped).    ..  *************
  44    2025-11-15 09:42    32  *************
  45    2025-11-15 10:41    31  ************
  46    2025-11-15 11:40    32  *************
 ...    ..(  3 skipped).    ..  *************
  50    2025-11-15 15:36    32  *************
  51    2025-11-15 16:35    31  ************
  52    2025-11-15 17:34    29  **********
  53    2025-11-15 18:33    28  *********
 ...    ..( 10 skipped).    ..  *********
  64    2025-11-16 05:22    28  *********
  65    2025-11-16 06:21    27  ********
  66    2025-11-16 07:20    28  *********
 ...    ..( 18 skipped).    ..  *********
  85    2025-11-17 02:01    28  *********
  86    2025-11-17 03:00    27  ********
  87    2025-11-17 03:59    27  ********
  88    2025-11-17 04:58    28  *********
  89    2025-11-17 05:57    27  ********
  90    2025-11-17 06:56    27  ********
  91    2025-11-17 07:55    27  ********
  92    2025-11-17 08:54    28  *********
 ...    ..(  9 skipped).    ..  *********
 102    2025-11-17 18:44    28  *********
 103    2025-11-17 19:43    29  **********
 104    2025-11-17 20:42    28  *********
 105    2025-11-17 21:41    28  *********
 106    2025-11-17 22:40    27  ********
 ...    ..(  2 skipped).    ..  ********
 109    2025-11-18 01:37    27  ********
 110    2025-11-18 02:36    26  *******
 ...    ..(  6 skipped).    ..  *******
 117    2025-11-18 09:29    26  *******
 118    2025-11-18 10:28    27  ********
 ...    ..(  6 skipped).    ..  ********
 125    2025-11-18 17:21    27  ********
 126    2025-11-18 18:20    26  *******
 ...    ..(  4 skipped).    ..  *******
   3    2025-11-18 23:15    26  *******
   4    2025-11-19 00:14    27  ********
   5    2025-11-19 01:13    26  *******
   6    2025-11-19 02:12    26  *******
   7    2025-11-19 03:11    25  ******
 ...    ..(  5 skipped).    ..  ******
  13    2025-11-19 09:05    25  ******
  14    2025-11-19 10:04    26  *******
 ...    ..(  3 skipped).    ..  *******
  18    2025-11-19 14:00    26  *******
  19    2025-11-19 14:59    27  ********
  20    2025-11-19 15:58     ?  -
  21    2025-11-19 16:57    26  *******

SCT Error Recovery Control:
           Read:     40 (4.0 seconds)
          Write:     40 (4.0 seconds)

Device Statistics (GP Log 0x04)
Page  Offset Size        Value Flags Description
0x01  =====  =               =  ===  == General Statistics (rev 1) ==
0x01  0x008  4              15  ---  Lifetime Power-On Resets
0x01  0x010  4            2388  ---  Power-on Hours
0x01  0x018  6     17703601664  ---  Logical Sectors Written
0x01  0x020  6       110131384  ---  Number of Write Commands
0x01  0x028  6     41928842312  ---  Logical Sectors Read
0x01  0x030  6        44912624  ---  Number of Read Commands
0x01  0x038  6               -  ---  Date and Time TimeStamp
0x03  =====  =               =  ===  == Rotating Media Statistics (rev 1) ==
0x03  0x008  4            2388  ---  Spindle Motor Power-on Hours
0x03  0x010  4            2388  ---  Head Flying Hours
0x03  0x018  4             109  ---  Head Load Events
0x03  0x020  4             320  ---  Number of Reallocated Logical Sectors
0x03  0x028  4               0  ---  Read Recovery Attempts
0x03  0x030  4               0  ---  Number of Mechanical Start Failures
0x03  0x038  4               0  ---  Number of Realloc. Candidate Logical Sectors
0x03  0x040  4              87  ---  Number of High Priority Unload Events
0x04  =====  =               =  ===  == General Errors Statistics (rev 1) ==
0x04  0x008  4               0  ---  Number of Reported Uncorrectable Errors
0x04  0x010  4               0  ---  Resets Between Cmd Acceptance and Completion
0x05  =====  =               =  ===  == Temperature Statistics (rev 1) ==
0x05  0x008  1              27  ---  Current Temperature
0x05  0x010  1              26  ---  Average Short Term Temperature
0x05  0x018  1              28  ---  Average Long Term Temperature
0x05  0x020  1              55  ---  Highest Temperature
0x05  0x028  1              25  ---  Lowest Temperature
0x05  0x030  1              51  ---  Highest Average Short Term Temperature
0x05  0x038  1              25  ---  Lowest Average Short Term Temperature
0x05  0x040  1              38  ---  Highest Average Long Term Temperature
0x05  0x048  1              28  ---  Lowest Average Long Term Temperature
0x05  0x050  4               0  ---  Time in Over-Temperature
0x05  0x058  1              60  ---  Specified Maximum Operating Temperature
0x05  0x060  4               0  ---  Time in Under-Temperature
0x05  0x068  1               5  ---  Specified Minimum Operating Temperature
0x06  =====  =               =  ===  == Transport Statistics (rev 1) ==
0x06  0x008  4              72  ---  Number of Hardware Resets
0x06  0x010  4              19  ---  Number of ASR Events
0x06  0x018  4               0  ---  Number of Interface CRC Errors
0xff  =====  =               =  ===  == Vendor Specific Statistics (rev 1) ==
0xff  0x008  7               0  ---  Vendor Specific
0xff  0x018  7               0  ---  Vendor Specific
                                |||_ C monitored condition met
                                ||__ D supports DSN
                                |___ N normalized value

Pending Defects log (GP Log 0x0c)
No Defects Logged

SATA Phy Event Counters (GP Log 0x11)
ID      Size     Value  Description
0x000a  2            2  Device-to-host register FISes sent due to a COMRESET
0x0001  2            0  Command failed due to ICRC error
0x0003  2            0  R_ERR response for device-to-host data FIS
0x0004  2            0  R_ERR response for host-to-device data FIS
0x0006  2            0  R_ERR response for device-to-host non-data FIS
0x0007  2            0  R_ERR response for host-to-device non-data FIS

Seagate FARM log (GP Log 0xa6) supported [try: -l farm]

sdb:

sudo smartctl -x /dev/sdb

smartctl 7.4 2023-08-01 r5530 [x86_64-linux-6.12.15-production+truenas] (local build)
Copyright (C) 2002-23, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Device Model:     ST12000NM0127
Serial Number:    ZJV16W9S
LU WWN Device Id: 5 000c50 0b153b94b
Firmware Version: G005
User Capacity:    12,000,138,625,024 bytes [12.0 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    7200 rpm
Form Factor:      3.5 inches
Device is:        Not in smartctl database 7.3/5528
ATA Version is:   ACS-3 T13/2161-D revision 5
SATA Version is:  SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is:    Wed Nov 19 17:28:39 2025 CET
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
AAM feature is:   Unavailable
APM feature is:   Unavailable
Rd look-ahead is: Enabled
Write cache is:   Enabled
DSN feature is:   Unavailable
ATA Security is:  Disabled, frozen [SEC2], Master PW ID: 0xfffd
Wt Cache Reorder: Enabled

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

General SMART Values:
Offline data collection status:  (0x82) Offline data collection activity
                                        was completed without error.
                                        Auto Offline Data Collection: Enabled.
Self-test execution status:      (   0) The previous self-test routine completed
                                        without error or no self-test has ever 
                                        been run.
Total time to complete Offline 
data collection:                (  575) seconds.
Offline data collection
capabilities:                    (0x7b) SMART execute Offline immediate.
                                        Auto Offline data collection on/off support.
                                        Suspend Offline collection upon new
                                        command.
                                        Offline surface scan supported.
                                        Self-test supported.
                                        Conveyance Self-test supported.
                                        Selective Self-test supported.
SMART capabilities:            (0x0003) Saves SMART data before entering
                                        power-saving mode.
                                        Supports SMART auto save timer.
Error logging capability:        (0x01) Error logging supported.
                                        General Purpose Logging supported.
Short self-test routine 
recommended polling time:        (   1) minutes.
Extended self-test routine
recommended polling time:        (1108) minutes.
Conveyance self-test routine
recommended polling time:        (   2) minutes.
SCT capabilities:              (0x50bd) SCT Status supported.
                                        SCT Error Recovery Control supported.
                                        SCT Feature Control supported.
                                        SCT Data Table supported.

SMART Attributes Data Structure revision number: 10
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAGS    VALUE WORST THRESH FAIL RAW_VALUE
  1 Raw_Read_Error_Rate     POSR--   081   063   044    -    133554558
  3 Spin_Up_Time            PO----   090   090   000    -    0
  4 Start_Stop_Count        -O--CK   100   100   020    -    33
  5 Reallocated_Sector_Ct   PO--CK   100   100   010    -    928
  7 Seek_Error_Rate         POSR--   088   060   045    -    669353257
  9 Power_On_Hours          -O--CK   086   086   000    -    12584
 10 Spin_Retry_Count        PO--C-   100   100   097    -    0
 12 Power_Cycle_Count       -O--CK   100   100   020    -    32
184 End-to-End_Error        -O--CK   100   100   099    -    0
187 Reported_Uncorrect      -O--CK   100   100   000    -    0
188 Command_Timeout         -O--CK   100   100   000    -    4295032833
190 Airflow_Temperature_Cel -O---K   071   046   040    -    29 (Min/Max 28/29)
192 Power-Off_Retract_Count -O--CK   100   100   000    -    353
193 Load_Cycle_Count        -O--CK   100   100   000    -    545
194 Temperature_Celsius     -O---K   029   054   000    -    29 (0 21 0 0 0)
195 Hardware_ECC_Recovered  -O-RC-   009   004   000    -    133554558
197 Current_Pending_Sector  -O--C-   100   100   000    -    8
198 Offline_Uncorrectable   ----C-   100   100   000    -    8
199 UDMA_CRC_Error_Count    -OSRCK   200   200   000    -    0
200 Multi_Zone_Error_Rate   PO---K   100   100   001    -    0
240 Head_Flying_Hours       ------   100   253   000    -    12558 (154 94 0)
241 Total_LBAs_Written      ------   100   253   000    -    39619356744
242 Total_LBAs_Read         ------   100   253   000    -    1154462233525
                            ||||||_ K auto-keep
                            |||||__ C event count
                            ||||___ R error rate
                            |||____ S speed/performance
                            ||_____ O updated online
                            |______ P prefailure warning

General Purpose Log Directory Version 1
SMART           Log Directory Version 1 [multi-sector log support]
Address    Access  R/W   Size  Description
0x00       GPL,SL  R/O      1  Log Directory
0x01           SL  R/O      1  Summary SMART error log
0x02           SL  R/O      5  Comprehensive SMART error log
0x03       GPL     R/O      5  Ext. Comprehensive SMART error log
0x04       GPL     R/O    256  Device Statistics log
0x04       SL      R/O      8  Device Statistics log
0x06           SL  R/O      1  SMART self-test log
0x07       GPL     R/O      1  Extended self-test log
0x08       GPL     R/O      2  Power Conditions log
0x09           SL  R/W      1  Selective self-test log
0x0c       GPL     R/O   2048  Pending Defects log
0x10       GPL     R/O      1  NCQ Command Error log
0x11       GPL     R/O      1  SATA Phy Event Counters log
0x13       GPL     R/O      1  SATA NCQ Send and Receive log
0x15       GPL     R/W      1  Rebuild Assist log
0x21       GPL     R/O      1  Write stream error log
0x22       GPL     R/O      1  Read stream error log
0x24       GPL     R/O    768  Current Device Internal Status Data log
0x30       GPL,SL  R/O      9  IDENTIFY DEVICE data log
0x80-0x9f  GPL,SL  R/W     16  Host vendor specific log
0xa1       GPL,SL  VS      24  Device vendor specific log
0xa2       GPL     VS   16320  Device vendor specific log
0xa4       GPL,SL  VS     160  Device vendor specific log
0xa6       GPL     VS     192  Device vendor specific log
0xa8-0xa9  GPL,SL  VS     136  Device vendor specific log
0xab       GPL     VS       1  Device vendor specific log
0xad       GPL     VS      16  Device vendor specific log
0xaf       GPL,SL  VS       1  Device vendor specific log
0xbe-0xbf  GPL     VS   65535  Device vendor specific log
0xc1       GPL,SL  VS       8  Device vendor specific log
0xc3       GPL,SL  VS      32  Device vendor specific log
0xc9       GPL,SL  VS       8  Device vendor specific log
0xca       GPL,SL  VS      16  Device vendor specific log
0xd1       GPL     VS     336  Device vendor specific log
0xd2       GPL     VS   10000  Device vendor specific log
0xd4       GPL     VS    2048  Device vendor specific log
0xda       GPL,SL  VS       1  Device vendor specific log
0xe0       GPL,SL  R/W      1  SCT Command/Status
0xe1       GPL,SL  R/W      1  SCT Data Transfer

SMART Extended Comprehensive Error Log Version: 1 (5 sectors)
No Errors Logged

SMART Extended Self-test Log Version: 1 (1 sectors)
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Short offline       Completed without error       00%     12518         -
# 2  Extended offline    Completed without error       00%     12489         -
# 3  Short offline       Completed without error       00%     12350         -
# 4  Short offline       Completed without error       00%     12182         -
# 5  Short offline       Completed without error       00%     12129         -
# 6  Short offline       Completed without error       00%     12014         -
# 7  Short offline       Completed without error       00%     11845         -
# 8  Extended offline    Completed without error       00%     11745         -
# 9  Short offline       Completed without error       00%     11677         -
#10  Short offline       Completed without error       00%     11509         -
#11  Short offline       Completed without error       00%     11341         -
#12  Short offline       Completed without error       00%     11173         -
#13  Extended offline    Completed without error       00%     11026         -
#14  Short offline       Completed without error       00%     11006         -
#15  Short offline       Completed without error       00%     10837         -
#16  Short offline       Completed without error       00%     10673         -
#17  Short offline       Completed without error       00%     10507         -
#18  Short offline       Completed without error       00%     10256         -
#19  Short offline       Completed without error       00%     10197         -

SMART Selective self-test log data structure revision number 1
 SPAN  MIN_LBA  MAX_LBA  CURRENT_TEST_STATUS
    1        0        0  Not_testing
    2        0        0  Not_testing
    3        0        0  Not_testing
    4        0        0  Not_testing
    5        0        0  Not_testing
Selective self-test flags (0x0):
  After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.

SCT Status Version:                  3
SCT Version (vendor specific):       522 (0x020a)
Device State:                        Active (0)
Current Temperature:                    29 Celsius
Power Cycle Min/Max Temperature:     28/29 Celsius
Lifetime    Min/Max Temperature:     21/54 Celsius
Under/Over Temperature Limit Count:   0/0
Vendor specific:
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 22 01 00 00 00 00 00 00 00 00 00 00 00 00

SCT Temperature History Version:     2
Temperature Sampling Period:         3 minutes
Temperature Logging Interval:        59 minutes
Min/Max recommended Temperature:     10/40 Celsius
Min/Max Temperature Limit:            5/60 Celsius
Temperature History Size (Index):    128 (47)

Index    Estimated Time   Temperature Celsius
  48    2025-11-14 12:04    31  ************
 ...    ..(  8 skipped).    ..  ************
  57    2025-11-14 20:55    31  ************
  58    2025-11-14 21:54    32  *************
  59    2025-11-14 22:53    36  *****************
  60    2025-11-14 23:52    37  ******************
  61    2025-11-15 00:51    36  *****************
 ...    ..(  3 skipped).    ..  *****************
  65    2025-11-15 04:47    36  *****************
  66    2025-11-15 05:46    35  ****************
 ...    ..(  3 skipped).    ..  ****************
  70    2025-11-15 09:42    35  ****************
  71    2025-11-15 10:41    34  ***************
  72    2025-11-15 11:40    35  ****************
 ...    ..(  3 skipped).    ..  ****************
  76    2025-11-15 15:36    35  ****************
  77    2025-11-15 16:35    34  ***************
  78    2025-11-15 17:34    31  ************
  79    2025-11-15 18:33    30  ***********
 ...    ..( 42 skipped).    ..  ***********
 122    2025-11-17 12:50    30  ***********
 123    2025-11-17 13:49    31  ************
 ...    ..(  2 skipped).    ..  ************
 126    2025-11-17 16:46    31  ************
 127    2025-11-17 17:45    30  ***********
   0    2025-11-17 18:44    31  ************
   1    2025-11-17 19:43    32  *************
   2    2025-11-17 20:42    30  ***********
 ...    ..(  2 skipped).    ..  ***********
   5    2025-11-17 23:39    30  ***********
   6    2025-11-18 00:38    29  **********
 ...    ..(  2 skipped).    ..  **********
   9    2025-11-18 03:35    29  **********
  10    2025-11-18 04:34    28  *********
 ...    ..(  3 skipped).    ..  *********
  14    2025-11-18 08:30    28  *********
  15    2025-11-18 09:29    29  **********
 ...    ..(  4 skipped).    ..  **********
  20    2025-11-18 14:24    29  **********
  21    2025-11-18 15:23    30  ***********
  22    2025-11-18 16:22    29  **********
 ...    ..(  2 skipped).    ..  **********
  25    2025-11-18 19:19    29  **********
  26    2025-11-18 20:18    28  *********
 ...    ..(  2 skipped).    ..  *********
  29    2025-11-18 23:15    28  *********
  30    2025-11-19 00:14    29  **********
  31    2025-11-19 01:13    28  *********
 ...    ..(  3 skipped).    ..  *********
  35    2025-11-19 05:09    28  *********
  36    2025-11-19 06:08    27  ********
  37    2025-11-19 07:07    28  *********
  38    2025-11-19 08:06    27  ********
  39    2025-11-19 09:05    28  *********
 ...    ..(  2 skipped).    ..  *********
  42    2025-11-19 12:02    28  *********
  43    2025-11-19 13:01    29  **********
  44    2025-11-19 14:00    29  **********
  45    2025-11-19 14:59    29  **********
  46    2025-11-19 15:58     ?  -
  47    2025-11-19 16:57    28  *********

SCT Error Recovery Control:
           Read:     40 (4.0 seconds)
          Write:     40 (4.0 seconds)

Device Statistics (GP Log 0x04)
Page  Offset Size        Value Flags Description
0x01  =====  =               =  ===  == General Statistics (rev 1) ==
0x01  0x008  4              32  ---  Lifetime Power-On Resets
0x01  0x010  4           12584  ---  Power-on Hours
0x01  0x018  6     39616113719  ---  Logical Sectors Written
0x01  0x020  6       304456579  ---  Number of Write Commands
0x01  0x028  6   1154426769949  ---  Logical Sectors Read
0x01  0x030  6     17743864019  ---  Number of Read Commands
0x01  0x038  6               -  ---  Date and Time TimeStamp
0x03  =====  =               =  ===  == Rotating Media Statistics (rev 1) ==
0x03  0x008  4      3659751734  N--  Spindle Motor Power-on Hours
0x03  0x010  4      3659751734  N--  Head Flying Hours
0x03  0x018  4             545  ---  Head Load Events
0x03  0x020  4             928  ---  Number of Reallocated Logical Sectors
0x03  0x028  4               1  ---  Read Recovery Attempts
0x03  0x030  4               0  ---  Number of Mechanical Start Failures
0x03  0x038  4               8  ---  Number of Realloc. Candidate Logical Sectors
0x03  0x040  4             353  ---  Number of High Priority Unload Events
0x04  =====  =               =  ===  == General Errors Statistics (rev 1) ==
0x04  0x008  4               1  ---  Number of Reported Uncorrectable Errors
0x04  0x010  4               1  ---  Resets Between Cmd Acceptance and Completion
0x05  =====  =               =  ===  == Temperature Statistics (rev 1) ==
0x05  0x008  1              29  ---  Current Temperature
0x05  0x010  1              28  ---  Average Short Term Temperature
0x05  0x018  1              30  ---  Average Long Term Temperature
0x05  0x020  1              54  ---  Highest Temperature
0x05  0x028  1              27  ---  Lowest Temperature
0x05  0x030  1              50  ---  Highest Average Short Term Temperature
0x05  0x038  1              28  ---  Lowest Average Short Term Temperature
0x05  0x040  1              47  ---  Highest Average Long Term Temperature
0x05  0x048  1              30  ---  Lowest Average Long Term Temperature
0x05  0x050  4               0  ---  Time in Over-Temperature
0x05  0x058  1              60  ---  Specified Maximum Operating Temperature
0x05  0x060  4               0  ---  Time in Under-Temperature
0x05  0x068  1               5  ---  Specified Minimum Operating Temperature
0x06  =====  =               =  ===  == Transport Statistics (rev 1) ==
0x06  0x008  4             368  ---  Number of Hardware Resets
0x06  0x010  4              94  ---  Number of ASR Events
0x06  0x018  4               0  ---  Number of Interface CRC Errors
0xff  =====  =               =  ===  == Vendor Specific Statistics (rev 1) ==
0xff  0x008  7               0  ---  Vendor Specific
0xff  0x018  7               0  ---  Vendor Specific
                                |||_ C monitored condition met
                                ||__ D supports DSN
                                |___ N normalized value

Pending Defects log (GP Log 0x0c)
Index                LBA    Hours
    0          457168800    12574
    1          457168801    12574
    2          457168802    12574
    3          457168803    12574
    4          457168804    12574
    5          457168805    12574
    6          457168806    12574
    7          457168807    12574

SATA Phy Event Counters (GP Log 0x11)
ID      Size     Value  Description
0x000a  2            2  Device-to-host register FISes sent due to a COMRESET
0x0001  2            0  Command failed due to ICRC error
0x0003  2            0  R_ERR response for device-to-host data FIS
0x0004  2            0  R_ERR response for host-to-device data FIS
0x0006  2            0  R_ERR response for device-to-host non-data FIS
0x0007  2            0  R_ERR response for host-to-device non-data FIS

Seagate FARM log (GP Log 0xa6) supported [try: -l farm]

sdc:

sudo smartctl -x /dev/sdc

smartctl 7.4 2023-08-01 r5530 [x86_64-linux-6.12.15-production+truenas] (local build)
Copyright (C) 2002-23, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Device Model:     ST12000NM0127
Serial Number:    ZJV16R96
LU WWN Device Id: 5 000c50 0b14e9f1f
Firmware Version: G005
User Capacity:    12,000,138,625,024 bytes [12.0 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    7200 rpm
Form Factor:      3.5 inches
Device is:        Not in smartctl database 7.3/5528
ATA Version is:   ACS-3 T13/2161-D revision 5
SATA Version is:  SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is:    Wed Nov 19 17:32:11 2025 CET
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
AAM feature is:   Unavailable
APM feature is:   Unavailable
Rd look-ahead is: Enabled
Write cache is:   Enabled
DSN feature is:   Unavailable
ATA Security is:  Disabled, frozen [SEC2]
Wt Cache Reorder: Enabled

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

General SMART Values:
Offline data collection status:  (0x82) Offline data collection activity
                                        was completed without error.
                                        Auto Offline Data Collection: Enabled.
Self-test execution status:      (   0) The previous self-test routine completed
                                        without error or no self-test has ever 
                                        been run.
Total time to complete Offline 
data collection:                (  575) seconds.
Offline data collection
capabilities:                    (0x7b) SMART execute Offline immediate.
                                        Auto Offline data collection on/off support.
                                        Suspend Offline collection upon new
                                        command.
                                        Offline surface scan supported.
                                        Self-test supported.
                                        Conveyance Self-test supported.
                                        Selective Self-test supported.
SMART capabilities:            (0x0003) Saves SMART data before entering
                                        power-saving mode.
                                        Supports SMART auto save timer.
Error logging capability:        (0x01) Error logging supported.
                                        General Purpose Logging supported.
Short self-test routine 
recommended polling time:        (   1) minutes.
Extended self-test routine
recommended polling time:        (1099) minutes.
Conveyance self-test routine
recommended polling time:        (   2) minutes.
SCT capabilities:              (0x50bd) SCT Status supported.
                                        SCT Error Recovery Control supported.
                                        SCT Feature Control supported.
                                        SCT Data Table supported.

SMART Attributes Data Structure revision number: 10
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAGS    VALUE WORST THRESH FAIL RAW_VALUE
  1 Raw_Read_Error_Rate     POSR--   079   064   044    -    75461254
  3 Spin_Up_Time            PO----   091   090   000    -    0
  4 Start_Stop_Count        -O--CK   100   100   020    -    35
  5 Reallocated_Sector_Ct   PO--CK   100   100   010    -    0
  7 Seek_Error_Rate         POSR--   088   060   045    -    648355836
  9 Power_On_Hours          -O--CK   086   086   000    -    12584
 10 Spin_Retry_Count        PO--C-   100   100   097    -    0
 12 Power_Cycle_Count       -O--CK   100   100   020    -    33
184 End-to-End_Error        -O--CK   100   100   099    -    0
187 Reported_Uncorrect      -O--CK   100   100   000    -    0
188 Command_Timeout         -O--CK   100   099   000    -    4295032833
190 Airflow_Temperature_Cel -O---K   073   048   040    -    27 (Min/Max 25/27)
192 Power-Off_Retract_Count -O--CK   100   100   000    -    342
193 Load_Cycle_Count        -O--CK   100   100   000    -    548
194 Temperature_Celsius     -O---K   027   052   000    -    27 (0 22 0 0 0)
195 Hardware_ECC_Recovered  -O-RC-   008   001   000    -    75461254
197 Current_Pending_Sector  -O--C-   100   100   000    -    0
198 Offline_Uncorrectable   ----C-   100   100   000    -    0
199 UDMA_CRC_Error_Count    -OSRCK   200   200   000    -    0
200 Multi_Zone_Error_Rate   PO---K   100   100   001    -    0
240 Head_Flying_Hours       ------   100   253   000    -    12560 (33 234 0)
241 Total_LBAs_Written      ------   100   253   000    -    39551778572
242 Total_LBAs_Read         ------   100   253   000    -    1153728002887
                            ||||||_ K auto-keep
                            |||||__ C event count
                            ||||___ R error rate
                            |||____ S speed/performance
                            ||_____ O updated online
                            |______ P prefailure warning

General Purpose Log Directory Version 1
SMART           Log Directory Version 1 [multi-sector log support]
Address    Access  R/W   Size  Description
0x00       GPL,SL  R/O      1  Log Directory
0x01           SL  R/O      1  Summary SMART error log
0x02           SL  R/O      5  Comprehensive SMART error log
0x03       GPL     R/O      5  Ext. Comprehensive SMART error log
0x04       GPL     R/O    256  Device Statistics log
0x04       SL      R/O      8  Device Statistics log
0x06           SL  R/O      1  SMART self-test log
0x07       GPL     R/O      1  Extended self-test log
0x08       GPL     R/O      2  Power Conditions log
0x09           SL  R/W      1  Selective self-test log
0x0c       GPL     R/O   2048  Pending Defects log
0x10       GPL     R/O      1  NCQ Command Error log
0x11       GPL     R/O      1  SATA Phy Event Counters log
0x13       GPL     R/O      1  SATA NCQ Send and Receive log
0x15       GPL     R/W      1  Rebuild Assist log
0x21       GPL     R/O      1  Write stream error log
0x22       GPL     R/O      1  Read stream error log
0x24       GPL     R/O    768  Current Device Internal Status Data log
0x30       GPL,SL  R/O      9  IDENTIFY DEVICE data log
0x80-0x9f  GPL,SL  R/W     16  Host vendor specific log
0xa1       GPL,SL  VS      24  Device vendor specific log
0xa2       GPL     VS   16320  Device vendor specific log
0xa4       GPL,SL  VS     160  Device vendor specific log
0xa6       GPL     VS     192  Device vendor specific log
0xa8-0xa9  GPL,SL  VS     136  Device vendor specific log
0xab       GPL     VS       1  Device vendor specific log
0xad       GPL     VS      16  Device vendor specific log
0xaf       GPL,SL  VS       1  Device vendor specific log
0xbe-0xbf  GPL     VS   65535  Device vendor specific log
0xc1       GPL,SL  VS       8  Device vendor specific log
0xc3       GPL,SL  VS      32  Device vendor specific log
0xc9       GPL,SL  VS       8  Device vendor specific log
0xca       GPL,SL  VS      16  Device vendor specific log
0xd1       GPL     VS     336  Device vendor specific log
0xd2       GPL     VS   10000  Device vendor specific log
0xd4       GPL     VS    2048  Device vendor specific log
0xda       GPL,SL  VS       1  Device vendor specific log
0xe0       GPL,SL  R/W      1  SCT Command/Status
0xe1       GPL,SL  R/W      1  SCT Data Transfer

SMART Extended Comprehensive Error Log Version: 1 (5 sectors)
No Errors Logged

SMART Extended Self-test Log Version: 1 (1 sectors)
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Short offline       Completed without error       00%     12517         -
# 2  Extended offline    Completed without error       00%     12489         -
# 3  Short offline       Completed without error       00%     12350         -
# 4  Short offline       Completed without error       00%     12182         -
# 5  Short offline       Completed without error       00%     12014         -
# 6  Short offline       Completed without error       00%     11845         -
# 7  Extended offline    Completed without error       00%     11744         -
# 8  Short offline       Completed without error       00%     11677         -
# 9  Short offline       Completed without error       00%     11509         -
#10  Short offline       Completed without error       00%     11341         -
#11  Short offline       Completed without error       00%     11173         -
#12  Extended offline    Completed without error       00%     11025         -
#13  Short offline       Completed without error       00%     11005         -
#14  Short offline       Completed without error       00%     10837         -
#15  Short offline       Completed without error       00%     10673         -
#16  Short offline       Completed without error       00%     10506         -
#17  Short offline       Completed without error       00%     10256         -
#18  Short offline       Completed without error       00%     10197         -
#19  Extended offline    Aborted by host               90%     10196         -

SMART Selective self-test log data structure revision number 1
 SPAN  MIN_LBA  MAX_LBA  CURRENT_TEST_STATUS
    1        0        0  Not_testing
    2        0        0  Not_testing
    3        0        0  Not_testing
    4        0        0  Not_testing
    5        0        0  Not_testing
Selective self-test flags (0x0):
  After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.

SCT Status Version:                  3
SCT Version (vendor specific):       522 (0x020a)
Device State:                        Active (0)
Current Temperature:                    27 Celsius
Power Cycle Min/Max Temperature:     25/27 Celsius
Lifetime    Min/Max Temperature:     21/53 Celsius
Under/Over Temperature Limit Count:   0/0
Vendor specific:
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 13 01 00 00 00 00 00 00 00 00 00 00 00 00

SCT Temperature History Version:     2
Temperature Sampling Period:         3 minutes
Temperature Logging Interval:        59 minutes
Min/Max recommended Temperature:     10/40 Celsius
Min/Max Temperature Limit:            5/60 Celsius
Temperature History Size (Index):    128 (48)

Index    Estimated Time   Temperature Celsius
  49    2025-11-14 12:04    28  *********
 ...    ..(  8 skipped).    ..  *********
  58    2025-11-14 20:55    28  *********
  59    2025-11-14 21:54    29  **********
  60    2025-11-14 22:53    33  **************
  61    2025-11-14 23:52    33  **************
  62    2025-11-15 00:51    32  *************
 ...    ..(  6 skipped).    ..  *************
  69    2025-11-15 07:44    32  *************
  70    2025-11-15 08:43    31  ************
 ...    ..(  7 skipped).    ..  ************
  78    2025-11-15 16:35    31  ************
  79    2025-11-15 17:34    28  *********
 ...    ..(  5 skipped).    ..  *********
  85    2025-11-15 23:28    28  *********
  86    2025-11-16 00:27    27  ********
 ...    ..(  5 skipped).    ..  ********
  92    2025-11-16 06:21    27  ********
  93    2025-11-16 07:20    28  *********
 ...    ..(  8 skipped).    ..  *********
 102    2025-11-16 16:11    28  *********
 103    2025-11-16 17:10    27  ********
 104    2025-11-16 18:09    27  ********
 105    2025-11-16 19:08    28  *********
 106    2025-11-16 20:07    28  *********
 107    2025-11-16 21:06    28  *********
 108    2025-11-16 22:05    27  ********
 ...    ..(  9 skipped).    ..  ********
 118    2025-11-17 07:55    27  ********
 119    2025-11-17 08:54    28  *********
 ...    ..(  9 skipped).    ..  *********
   1    2025-11-17 18:44    28  *********
   2    2025-11-17 19:43    29  **********
   3    2025-11-17 20:42    28  *********
   4    2025-11-17 21:41    28  *********
   5    2025-11-17 22:40    27  ********
   6    2025-11-17 23:39    27  ********
   7    2025-11-18 00:38    27  ********
   8    2025-11-18 01:37    26  *******
 ...    ..(  2 skipped).    ..  *******
  11    2025-11-18 04:34    26  *******
  12    2025-11-18 05:33    25  ******
  13    2025-11-18 06:32    25  ******
  14    2025-11-18 07:31    26  *******
 ...    ..(  3 skipped).    ..  *******
  18    2025-11-18 11:27    26  *******
  19    2025-11-18 12:26    27  ********
 ...    ..(  4 skipped).    ..  ********
  24    2025-11-18 17:21    27  ********
  25    2025-11-18 18:20    26  *******
 ...    ..(  5 skipped).    ..  *******
  31    2025-11-19 00:14    26  *******
  32    2025-11-19 01:13    25  ******
 ...    ..(  8 skipped).    ..  ******
  41    2025-11-19 10:04    25  ******
  42    2025-11-19 11:03    26  *******
 ...    ..(  3 skipped).    ..  *******
  46    2025-11-19 14:59    26  *******
  47    2025-11-19 15:58     ?  -
  48    2025-11-19 16:57    25  ******

SCT Error Recovery Control:
           Read:     40 (4.0 seconds)
          Write:     40 (4.0 seconds)

Device Statistics (GP Log 0x04)
Page  Offset Size        Value Flags Description
0x01  =====  =               =  ===  == General Statistics (rev 1) ==
0x01  0x008  4              33  ---  Lifetime Power-On Resets
0x01  0x010  4           12584  ---  Power-on Hours
0x01  0x018  6     39546824847  ---  Logical Sectors Written
0x01  0x020  6       302597295  ---  Number of Write Commands
0x01  0x028  6   1153690510650  ---  Logical Sectors Read
0x01  0x030  6     18396765447  ---  Number of Read Commands
0x01  0x038  6               -  ---  Date and Time TimeStamp
0x03  =====  =               =  ===  == Rotating Media Statistics (rev 1) ==
0x03  0x008  4      2337691102  N--  Spindle Motor Power-on Hours
0x03  0x010  4      2337691102  N--  Head Flying Hours
0x03  0x018  4             548  ---  Head Load Events
0x03  0x020  4               0  ---  Number of Reallocated Logical Sectors
0x03  0x028  4               1  ---  Read Recovery Attempts
0x03  0x030  4               0  ---  Number of Mechanical Start Failures
0x03  0x038  4               0  ---  Number of Realloc. Candidate Logical Sectors
0x03  0x040  4             342  ---  Number of High Priority Unload Events
0x04  =====  =               =  ===  == General Errors Statistics (rev 1) ==
0x04  0x008  4               0  ---  Number of Reported Uncorrectable Errors
0x04  0x010  4               1  ---  Resets Between Cmd Acceptance and Completion
0x05  =====  =               =  ===  == Temperature Statistics (rev 1) ==
0x05  0x008  1              27  ---  Current Temperature
0x05  0x010  1              25  ---  Average Short Term Temperature
0x05  0x018  1              28  ---  Average Long Term Temperature
0x05  0x020  1              52  ---  Highest Temperature
0x05  0x028  1              25  ---  Lowest Temperature
0x05  0x030  1              49  ---  Highest Average Short Term Temperature
0x05  0x038  1              25  ---  Lowest Average Short Term Temperature
0x05  0x040  1              46  ---  Highest Average Long Term Temperature
0x05  0x048  1              28  ---  Lowest Average Long Term Temperature
0x05  0x050  4               0  ---  Time in Over-Temperature
0x05  0x058  1              60  ---  Specified Maximum Operating Temperature
0x05  0x060  4               0  ---  Time in Under-Temperature
0x05  0x068  1               5  ---  Specified Minimum Operating Temperature
0x06  =====  =               =  ===  == Transport Statistics (rev 1) ==
0x06  0x008  4             403  ---  Number of Hardware Resets
0x06  0x010  4              95  ---  Number of ASR Events
0x06  0x018  4               0  ---  Number of Interface CRC Errors
0xff  =====  =               =  ===  == Vendor Specific Statistics (rev 1) ==
0xff  0x008  7               0  ---  Vendor Specific
0xff  0x018  7               0  ---  Vendor Specific
                                |||_ C monitored condition met
                                ||__ D supports DSN
                                |___ N normalized value

Pending Defects log (GP Log 0x0c)
No Defects Logged

SATA Phy Event Counters (GP Log 0x11)
ID      Size     Value  Description
0x000a  2            3  Device-to-host register FISes sent due to a COMRESET
0x0001  2            0  Command failed due to ICRC error
0x0003  2            0  R_ERR response for device-to-host data FIS
0x0004  2            0  R_ERR response for host-to-device data FIS
0x0006  2            0  R_ERR response for device-to-host non-data FIS
0x0007  2            0  R_ERR response for host-to-device non-data FIS

Seagate FARM log (GP Log 0xa6) supported [try: -l farm]

zpool status:

sudo zpool status -v
  pool: Main
 state: ONLINE
  scan: scrub repaired 192K in 06:51:03 with 0 errors on Sat Nov  1 06:51:06 2025
config:

        NAME                                      STATE     READ WRITE CKSUM
        Main                                      ONLINE       0     0     0
          raidz1-0                                ONLINE       0     0     0
            bf2401b4-77e1-4ee2-887e-3d307d55bc7f  ONLINE       0     0     0
            0fd699ce-5fc1-4ccb-aae3-4d0e33b67deb  ONLINE       0     0     0
            333c9540-76db-4ca1-8312-a3e9824a9900  ONLINE       0     0     0

errors: No known data errors

  pool: boot-pool
 state: ONLINE
  scan: scrub repaired 0B in 00:00:22 with 0 errors on Sun Nov 16 03:45:23 2025
config:

        NAME         STATE     READ WRITE CKSUM
        boot-pool    ONLINE       0     0     0
          nvme0n1p3  ONLINE       0     0     0

errors: No known data errors

I added also sda as I rebooted the nas.

Thank you for your fast response

5

Ok I should have a spare around, how can I identify the disk now that I rebooted? I don’t really know how to read smartctl results

6

IMO all 3 drives have serious problems.
Backup your data ASAP

7

OMG that’s alarming, could you explain to me why u think that? Just to understand what to keep an eye on next time

8

Im no expert but these high numbers of Read error rate/reallocated sectors and seek error rate dont sound good.
this is “sdb”.

Where did you get these drives from ? The 2 oldest only have 500 days of on hours.

9

Ok I understand, thank you.

I got them on Amazon, I bought them as refurbished something like 2 years ago

10

Yeah I doubt they only have 500 days of runtime… That would be only 1.3 years. Probably got scammed.

11

Thank you for your help, I’ll proceed to buy new not used drives and change all of them

You’ve been very helpful. Have a nice day

12

New ones can fail too if your unlucky.
Before you comit data to them. Do a burn in. And a long smart test afterwards.

When you replace the disc, dont disconnect the old ones. Do a replace. Otherwise you may lose the Pool during the resilver because of the added stress.

13

Seagate drives use a different way of showing read errors so it may be in your interest to convert it using for example this Seagate Error Rate Calculator.

ZJV4A37N (sda) and ZJV16W9S (sdb) both have reallocated sectors which is a warning sign.

sda has 10 Reported_Uncorrect and sdb has 8 Current_Pending_Sector and 8 Offline_Uncorrectable events logged. These compound the issues with reallocated sectors. Replacing them or at least having drives ready for replacement would be wise, plus of course verifying that your backup is working as expected.

I don’t see anything obviously bad or concerning with ZJV16R96 (sdc).