Hello,

I have ZFS running over LUKS encryption. ZFS out of a sudden started showing errors,

$zpool status
pool: tank  
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 10:13:00 with 0 errors on Fri Nov 17 01:43:01 2023  
config:  
  
NAME STATE READ WRITE CKSUM  
tank ONLINE 0 0 0  
mirror-0 ONLINE 0 0 0  
disk1.eli ONLINE 0 0 0  
disk2.eli ONLINE 0 184 4  
  
errors: No known data errors

which also shows up in dmesg,

[76443.247801] zio pool=tank vdev=/dev/mapper/disk1.eli error=5 type=2 offset=2103171743744 size=53248 flags=1074267264
[80861.452444] zio pool=tank vdev=/dev/mapper/disk1.eli error=5 type=2 offset=1841919950848 size=40960 flags=1074267264
[82374.040979] zio pool=tank vdev=/dev/mapper/disk1.eli error=5 type=2 offset=7028176924672 size=4096 flags=1572992

However smart ‘long’ test shows up ok. There doesnt seems to be any sector errors,

# smartctl -a /dev/sdc
smartctl 7.4 2023-08-01 r5530 [x86_64-linux-6.1.63-1-lts] (local build)
Copyright (C) 2002-23, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Western Digital Red
Device Model:     WDC WD80EFZX-68UW8N0
Firmware Version: 83.H0A83
User Capacity:    8,001,563,222,016 bytes [8.00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    5400 rpm
Form Factor:      3.5 inches
Device is:        In smartctl database 7.3/5528
ATA Version is:   ACS-2, ATA8-ACS T13/1699-D revision 4
SATA Version is:  SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is:    Wed Nov 29 21:30:52 2023 IST
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:  (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:                (  101) seconds.
Offline data collection
capabilities:                    (0x5b) SMART execute Offline immediate.
                                        Auto Offline data collection on/off support.
                                        Suspend Offline collection upon new
                                        command.
                                        Offline surface scan supported.
                                        Self-test supported.
                                        No 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:        (   2) minutes.
Extended self-test routine
recommended polling time:        (1100) minutes.
SCT capabilities:              (0x003d) SCT Status supported.
                                        SCT Error Recovery Control supported.
                                        SCT Feature Control supported.
                                        SCT Data Table supported.

SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x000b   100   100   016    Pre-fail  Always       -       0
  2 Throughput_Performance  0x0005   132   132   054    Pre-fail  Offline      -       112
  3 Spin_Up_Time            0x0007   155   155   024    Pre-fail  Always       -       473 (Average 376)
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       632
  5 Reallocated_Sector_Ct   0x0033   100   100   005    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x000b   100   100   067    Pre-fail  Always       -       0
  8 Seek_Time_Performance   0x0005   128   128   020    Pre-fail  Offline      -       18
  9 Power_On_Hours          0x0012   093   093   000    Old_age   Always       -       49433
 10 Spin_Retry_Count        0x0013   100   100   060    Pre-fail  Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       609
 22 Helium_Level            0x0023   100   100   025    Pre-fail  Always       -       100
192 Power-Off_Retract_Count 0x0032   007   007   000    Old_age   Always       -       112187
193 Load_Cycle_Count        0x0012   007   007   000    Old_age   Always       -       112187
194 Temperature_Celsius     0x0002   171   171   000    Old_age   Always       -       35 (Min/Max 21/49)
196 Reallocated_Event_Count 0x0032   100   100   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0022   100   100   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0008   100   100   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x000a   200   200   000    Old_age   Always       -       0

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 without error       00%     49409         -
# 2  Extended offline    Completed without error       00%     49406         -
# 3  Extended offline    Completed without error       00%     49405         -
# 4  Short offline       Completed without error       00%     49405         -
# 5  Extended offline    Completed without error       00%     41597         -
# 6  Extended offline    Interrupted (host reset)      20%     41579         -
# 7  Short offline       Completed without error       00%     21843         -
# 8  Short offline       Completed without error       00%     10193         -
# 9  Extended offline    Completed without error       00%        26         -
#10  Extended offline    Aborted by host               40%         9         -
#11  Short offline       Completed without error       00%         0         -

Does this disk need to be replaced?

  • WindowlessBasement@alien.topBEnglish
    1·
    10 months ago

    The error message tells you what to.

    If this is just a random error you are unconcerned by (recent power outage, flakely cables, etc), you can clear the errors. If you believe the drive is failing, you can replace the drive. The array will remain in a degraded state until you make a decision.

    • trumee@alien.topOPBEnglish
      1·
      10 months ago

      We could tell you our opinions based on smart data, but you decided to post a wall of text that hurts eyes to read instead of formatting it.

      I have updated the post with the smart data.

  • erm_what_@alien.topBEnglish
    1·
    10 months ago

    I would expect it to be a cable issue. I had long after market power cables on a consumer (Corsair) PSU which caused a voltage drop of about 1V which was enough to cause errors.

    Dodgy SATA/SAS cables can also cause it.

    The SAS controller overheating can also do it. I had them again when I didn’t have a fan on my LSI card.