Help understanding my SMART test

tooclose · January 12, 2025, 8:33pm

I have been getting notifications about bad sectors for a week or two , but each time I checked the SMART test results in the gui everything passed. I even ran some manual tests that still showed passed, until the most recent one that did fail. Should I be worried? These are brand new drives.

These were the notifications: Device: /dev/sda [SAT], 8 Currently unreadable (pending) sectors.

=== START OF INFORMATION SECTION ===
Model Family:     Seagate BarraCuda 3.5 (SMR)
Device Model:     ST2000DM008-2FR102
Serial Number:    ZFL0ZCEL
LU WWN Device Id: 5 000c50 0c30114c5
Firmware Version: 0001
User Capacity:    2,000,398,934,016 bytes [2.00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    7200 rpm
Form Factor:      3.5 inches
TRIM Command:     Available
Device is:        In smartctl database 7.3/5625
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:    Sun Jan 12 12:19:54 2025 PST
SMART support is: Available - device has SMART capability.
SMART support is: 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:      ( 117) The previous self-test completed having
                                        the read element of the test failed.
Total time to complete Offline 
data collection:                (    0) 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:        ( 196) minutes.
Conveyance self-test routine
recommended polling time:        (   2) minutes.
SCT capabilities:              (0x30a5) SCT Status supported.
                                        SCT Data Table supported.

SMART Attributes Data Structure revision number: 10
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x000f   061   057   006    Pre-fail  Always       -       21609096
  3 Spin_Up_Time            0x0003   098   098   000    Pre-fail  Always       -       0
  4 Start_Stop_Count        0x0032   100   100   020    Old_age   Always       -       68
  5 Reallocated_Sector_Ct   0x0033   100   100   010    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x000f   076   060   045    Pre-fail  Always       -       42187533
  9 Power_On_Hours          0x0032   099   099   000    Old_age   Always       -       1138h+21m+52.374s
 10 Spin_Retry_Count        0x0013   100   100   097    Pre-fail  Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   020    Old_age   Always       -       68
183 Runtime_Bad_Block       0x0032   100   100   000    Old_age   Always       -       0
184 End-to-End_Error        0x0032   100   100   099    Old_age   Always       -       0
187 Reported_Uncorrect      0x0032   100   100   000    Old_age   Always       -       0
188 Command_Timeout         0x0032   100   100   000    Old_age   Always       -       0 0 0
189 High_Fly_Writes         0x003a   100   100   000    Old_age   Always       -       0
190 Airflow_Temperature_Cel 0x0022   068   065   040    Old_age   Always       -       32 (Min/Max 31/35)
191 G-Sense_Error_Rate      0x0032   100   100   000    Old_age   Always       -       0
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       78
193 Load_Cycle_Count        0x0032   100   100   000    Old_age   Always       -       133
194 Temperature_Celsius     0x0022   032   040   000    Old_age   Always       -       32 (0 20 0 0 0)
195 Hardware_ECC_Recovered  0x001a   073   064   000    Old_age   Always       -       21609096
197 Current_Pending_Sector  0x0012   100   100   000    Old_age   Always       -       8
198 Offline_Uncorrectable   0x0010   100   100   000    Old_age   Offline      -       8
199 UDMA_CRC_Error_Count    0x003e   200   200   000    Old_age   Always       -       0
240 Head_Flying_Hours       0x0000   100   253   000    Old_age   Offline      -       1105h+29m+07.542s
241 Total_LBAs_Written      0x0000   100   253   000    Old_age   Offline      -       537781456
242 Total_LBAs_Read         0x0000   100   253   000    Old_age   Offline      -       548819684

SMART Error Log Version: 1
No Errors Logged

SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Extended offline    Completed: read failure       50%      1138         2418219344
# 2  Short offline       Completed without error       00%      1132         -
# 3  Short offline       Completed without error       00%      1108         -
# 4  Extended offline    Completed: read failure       50%      1085         2418219344
# 5  Short offline       Completed without error       00%      1060         -
# 6  Short offline       Completed without error       00%      1036         -
# 7  Short offline       Completed without error       00%      1012         -
# 8  Short offline       Completed without error       00%       988         -
# 9  Short offline       Completed without error       00%       964         -
#10  Short offline       Completed without error       00%       940         -

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.

winnielinnie · January 12, 2025, 8:40pm

Two problems.

Yes, the drive is indeed failing. The selftest log shows it cannot complete an extended test.
This is an SMR drive. Highly discouraged for use with ZFS.

Is the pool constructed with redundancy? What is its layout?

zpool status -v <poolname>

tooclose · January 12, 2025, 8:55pm

Its 2 drives mirrored.

pool: Main Storage
state: ONLINE
scan: scrub repaired 0B in 00:10:52 with 0 errors on Mon Jan 6 18:32:59 2025
config:

    NAME                                      STATE     READ WRITE CKSUM
    Main Storage                              ONLINE       0     0     0
      mirror-0                                ONLINE       0     0     0
        7a7a0836-9987-4dd0-9e4d-2bd85f0c666b  ONLINE       0     0     0
        4e33d63d-3519-4bd5-b7e6-c637f90324d3  ONLINE       0     0     0

errors: No known data errors

pool: boot-pool
state: ONLINE
scan: scrub repaired 0B in 00:00:18 with 0 errors on Sun Jan 12 03:45:19 2025
config:

    NAME        STATE     READ WRITE CKSUM
    boot-pool   ONLINE       0     0     0
      sdc3      ONLINE       0     0     0

errors: No known data errors

winnielinnie · January 12, 2025, 9:23pm

I would consider replacing the failing drive^[1], and to switch to only CMR drives when it’s feasible for you. It depends how valuable and irreplaceable this data is.

It seems there’s not much data on your pool, since it only took 10 minutes to scrub.

If you have a free SATA port, you can add the new drive into the mirror, which will convert the vdev to a three-way mirror. After the resilver succeeds, you can detach the failing drive and RMA it or toss it, or do whatever you want with it. ↩︎

tooclose · January 12, 2025, 10:06pm

thanks for all the info, this is the first time I couldn’t reddit search my way out of it. I only put a couple dozen movies on to test jellyfin and some other apps which is good.

I actually bought 3 drives and put one in my pc so I do have one to resilver with. I didn’t know the CMR drives thing so thanks for the tip, I’ll switch over to some ironwolf drives then. This has been a great learning moment.