I am using TrueNAS Community Edition 25.04.0. I just received an alert from my TrueNAS via email.
I have a mirrored pool with 2 Kingston SSDs, model A400, 480 GB. After a periodic scrub, one of the SSDs is showing “4 errors,” consisting of 3 read errors and 1 checksum error:
To help with diagnosis, please open the web shell or a SSH session and provide the output of some commands as formatted text (</> button): sudo zpool status sudo smartctl -x /dev/sdc (assuming you have not rebooted)
No. It doesn’t look that critical.
Bare metal install? All drives on motherboard ports? Wich motherboard/CPU/RAM by the way?
If you have to replace the drive, you can just take it out and put the new drive in its place; optionally, you may put the old drive on a USB adapter so it’s still available to provide redundancy during resilver.
I ended up not running the suggested commands. I wasn’t too concerned since you said it wouldn’t be anything critical.
Just yesterday, I opened up the case and replaced the SSD that was having issues. The resilvering process completed successfully, and I haven’t had any problems since.
I’ve been thinking about buying an HBA card to add 4 more SATA ports to my NAS and keep a few drives as hot spares…
pool: boot-pool
state: ONLINE
status: One or more devices has experienced an unrecoverable error. An
attempt was made to correct the error. Applications are unaffected.
action: Determine if the device needs to be replaced, and clear the errors
using 'zpool clear' or replace the device with 'zpool replace'.
see: https://openzfs.github.io/openzfs-docs/msg/ZFS-8000-9P
scan: scrub repaired 0B in 00:00:14 with 0 errors on Sun May 4 11:18:55 2025
config:
NAME STATE READ WRITE CKSUM
boot-pool ONLINE 0 0 0
sda3 ONLINE 0 2 0
errors: No known data errors
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 ===
Model Family: Phison Driven SSDs
Device Model: KINGSTON SA400S37480G
Serial Number: 50026B778441289A
LU WWN Device Id: 5 0026b7 78441289a
Firmware Version: SAH20105
User Capacity: 480,103,981,056 bytes [480 GB]
Sector Size: 512 bytes logical/physical
Rotation Rate: Solid State Device
TRIM Command: Available
Device is: In smartctl database 7.3/5706
ATA Version is: ACS-3 T13/2161-D revision 4
SATA Version is: SATA 3.2, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is: Sun May 4 19:40:22 2025 -03
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
AAM feature is: Unavailable
APM feature is: Disabled
Rd look-ahead is: Enabled
Write cache is: Enabled
DSN feature is: Unavailable
ATA Security is: Disabled, frozen [SEC2]
Wt Cache Reorder: Unavailable
=== 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: ( 120) seconds.
Offline data collection
capabilities: (0x11) SMART execute Offline immediate.
No Auto Offline data collection support.
Suspend Offline collection upon new
command.
No Offline surface scan supported.
Self-test supported.
No Conveyance Self-test supported.
No Selective Self-test supported.
SMART capabilities: (0x0002) Does not save 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: ( 2) minutes.
Extended self-test routine
recommended polling time: ( 10) minutes.
SMART Attributes Data Structure revision number: 1
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAGS VALUE WORST THRESH FAIL RAW_VALUE
1 Raw_Read_Error_Rate -O--CK 100 100 000 - 100
9 Power_On_Hours -O--CK 100 100 000 - 6358
12 Power_Cycle_Count -O--CK 100 100 000 - 187
148 Unknown_Attribute ------ 100 100 000 - 0
149 Unknown_Attribute ------ 100 100 000 - 0
167 Write_Protect_Mode ------ 100 100 000 - 0
168 SATA_Phy_Error_Count -O--C- 100 100 000 - 1
169 Bad_Block_Rate ------ 100 100 000 - 0
170 Bad_Blk_Ct_Lat/Erl ------ 100 100 010 - 0/0
172 Erase_Fail_Count -O--CK 100 100 000 - 0
173 MaxAvgErase_Ct ------ 100 100 000 - 0
181 Program_Fail_Count -O--CK 100 100 000 - 0
182 Erase_Fail_Count ------ 100 100 000 - 0
187 Reported_Uncorrect -O--CK 100 100 000 - 0
192 Unsafe_Shutdown_Count -O--C- 100 100 000 - 112
194 Temperature_Celsius -O---K 030 039 000 - 30 (Min/Max 19/39)
196 Reallocated_Event_Count -O--CK 100 100 000 - 0
199 SATA_CRC_Error_Count -O--CK 100 100 000 - 0
218 CRC_Error_Count -O--CK 100 100 000 - 1
231 SSD_Life_Left ------ 099 099 000 - 99
233 Flash_Writes_GiB -O--CK 100 100 000 - 936
241 Lifetime_Writes_GiB -O--CK 100 100 000 - 1601
242 Lifetime_Reads_GiB -O--CK 100 100 000 - 540
244 Average_Erase_Count ------ 100 100 000 - 11
245 Max_Erase_Count ------ 100 100 000 - 29
246 Total_Erase_Count ------ 100 100 000 - 6066
||||||_ 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 1 Comprehensive SMART error log
0x03 GPL R/O 1 Ext. Comprehensive SMART error log
0x04 GPL,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
0x10 GPL R/O 1 NCQ Command Error log
0x11 GPL R/O 1 SATA Phy Event Counters log
0x30 GPL,SL R/O 9 IDENTIFY DEVICE data log
0x80-0x9f GPL,SL R/W 16 Host vendor specific log
0xde GPL VS 8 Device vendor specific log
SMART Extended Comprehensive Error Log Version: 1 (1 sectors)
Device Error Count: 3
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 3 [2] occurred at disk power-on lifetime: 0 hours (0 days + 0 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
-- -- -- == -- == == == -- -- -- -- --
04 -- 51 00 00 00 00 00 00 00 00 40 00 Error: ABRT
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
-- == -- == -- == == == -- -- -- -- -- --------------- --------------------
b0 00 d1 01 01 00 00 4f 00 c2 01 00 08 00:00:00.000 SMART READ ATTRIBUTE THRESHOLDS [OBS-4]
2f 00 00 01 01 00 00 00 00 00 03 00 08 00:00:00.000 READ LOG EXT
2f 00 00 01 01 00 00 00 00 00 00 00 08 00:00:00.000 READ LOG EXT
b0 00 d5 01 01 00 00 4f 00 c2 00 00 08 00:00:00.000 SMART READ LOG
b0 00 da 00 00 00 00 4f 00 c2 00 00 08 00:00:00.000 SMART RETURN STATUS
Error 2 [1] log entry is empty
Error 1 [0] log entry is empty
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% 497 -
Selective Self-tests/Logging not supported
SCT Commands not supported
Device Statistics (GP Log 0x04)
Page Offset Size Value Flags Description
0x01 ===== = = === == General Statistics (rev 1) ==
0x01 0x008 4 187 --- Lifetime Power-On Resets
0x01 0x010 4 6358 --- Power-on Hours
0x01 0x018 6 3359628590 --- Logical Sectors Written
0x01 0x020 6 527969 --- Number of Write Commands
0x01 0x028 6 1134221608 --- Logical Sectors Read
0x01 0x030 6 160682 --- Number of Read Commands
0x07 ===== = = === == Solid State Device Statistics (rev 1) ==
0x07 0x008 1 1 --- Percentage Used Endurance Indicator
|||_ C monitored condition met
||__ D supports DSN
|___ N normalized value
Pending Defects log (GP Log 0x0c) not supported
SATA Phy Event Counters (GP Log 0x11)
ID Size Value Description
0x0001 4 1 Command failed due to ICRC error
0x0002 4 1 R_ERR response for data FIS
0x0005 4 0 R_ERR response for non-data FIS
0x000a 4 3 Device-to-host register FISes sent due to a COMRESET
