Checksum errors

[Kevin Horton]

I've got one drive that has thrown checksum errors twice in the last week, as reported by zpool status. The first time was a single checksum error. I did a SMART long test, and no issues were obvious to me. I did a zpool clear, and now several days later, during a routine scrub, I get another report of a degraded pool, with the same disk as the cause.

Code:

  pool: main
 state: DEGRADED
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: http://illumos.org/msg/ZFS-8000-9P
  scan: scrub in progress since Mon Jun 29 21:00:43 2020
    14.9T scanned at 451M/s, 12.7T issued at 381M/s, 15.4T total
    2.76M repaired, 82.26% done, 0 days 02:04:58 to go
config:

    NAME                                            STATE     READ WRITE CKSUM
    main                                            DEGRADED     0     0     0
      raidz2-0                                      DEGRADED     0     0     0
        gptid/73e9c0c5-d607-11e6-8ce7-0cc47ad9b1ca  ONLINE       0     0     0
        gptid/749fe03a-d607-11e6-8ce7-0cc47ad9b1ca  ONLINE       0     0     0
        gptid/75508dd8-d607-11e6-8ce7-0cc47ad9b1ca  ONLINE       0     0     0
        gptid/76057e53-d607-11e6-8ce7-0cc47ad9b1ca  DEGRADED     0     0   707  too many errors
        gptid/76b682c2-d607-11e6-8ce7-0cc47ad9b1ca  ONLINE       0     0     0
        gptid/7760db32-d607-11e6-8ce7-0cc47ad9b1ca  ONLINE       0     0     0
        gptid/781a0c8e-d607-11e6-8ce7-0cc47ad9b1ca  ONLINE       0     0     0
        gptid/78ce7800-d607-11e6-8ce7-0cc47ad9b1ca  ONLINE       0     0     0

errors: No known data errors

I'll run another long SMART test once the scrub has finished. I had started one, then saw that a scrub was in progress, so I aborted it, not wanting to slow down the scrub.

SMART status:

Code:

smartctl 7.0 2018-12-30 r4883 [FreeBSD 11.3-RELEASE-p9 amd64] (local build)
Copyright (C) 2002-18, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Western Digital Red
Device Model:     WDC WD40EFRX-68WT0N0
Serial Number:    WD-WCC4E7JD09SA
LU WWN Device Id: 5 0014ee 2629e18a6
Firmware Version: 82.00A82
User Capacity:    4,000,787,030,016 bytes [4.00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    5400 rpm
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ACS-2 (minor revision not indicated)
SATA Version is:  SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is:    Tue Jun 30 06:44:46 2020 PDT
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, NOT FROZEN [SEC1]
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:      (  25)    The self-test routine was aborted by
                    the host.
Total time to complete Offline 
data collection:         (51840) 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:      (   2) minutes.
Extended self-test routine
recommended polling time:      ( 518) minutes.
Conveyance self-test routine
recommended polling time:      (   5) minutes.
SCT capabilities:            (0x703d)    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          FLAGS    VALUE WORST THRESH FAIL RAW_VALUE
  1 Raw_Read_Error_Rate     POSR-K   200   200   051    -    0
  3 Spin_Up_Time            POS--K   188   175   021    -    7600
  4 Start_Stop_Count        -O--CK   100   100   000    -    102
  5 Reallocated_Sector_Ct   PO--CK   200   200   140    -    0
  7 Seek_Error_Rate         -OSR-K   100   253   000    -    0
  9 Power_On_Hours          -O--CK   060   060   000    -    29578
 10 Spin_Retry_Count        -O--CK   100   100   000    -    0
 11 Calibration_Retry_Count -O--CK   100   100   000    -    0
 12 Power_Cycle_Count       -O--CK   100   100   000    -    102
192 Power-Off_Retract_Count -O--CK   200   200   000    -    57
193 Load_Cycle_Count        -O--CK   200   200   000    -    983
194 Temperature_Celsius     -O---K   114   112   000    -    38
196 Reallocated_Event_Count -O--CK   200   200   000    -    0
197 Current_Pending_Sector  -O--CK   200   200   000    -    0
198 Offline_Uncorrectable   ----CK   100   253   000    -    0
199 UDMA_CRC_Error_Count    -O--CK   200   200   000    -    0
200 Multi_Zone_Error_Rate   ---R--   200   200   000    -    0
                            ||||||_ 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      6  Ext. Comprehensive SMART error log
0x06           SL  R/O      1  SMART self-test log
0x07       GPL     R/O      1  Extended self-test log
0x09           SL  R/W      1  Selective self-test log
0x10       GPL     R/O      1  NCQ Command Error log
0x11       GPL     R/O      1  SATA Phy Event Counters log
0x21       GPL     R/O      1  Write stream error log
0x22       GPL     R/O      1  Read stream error log
0x80-0x9f  GPL,SL  R/W     16  Host vendor specific log
0xa0-0xa7  GPL,SL  VS      16  Device vendor specific log
0xa8-0xb6  GPL,SL  VS       1  Device vendor specific log
0xb7       GPL,SL  VS      39  Device vendor specific log
0xbd       GPL,SL  VS       1  Device vendor specific log
0xc0       GPL,SL  VS       1  Device vendor specific log
0xc1       GPL     VS      93  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 (6 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  Extended offline    Aborted by host               90%     29578         -
# 2  Short offline       Completed without error       00%     29568         -
# 3  Short offline       Completed without error       00%     29544         -
# 4  Extended offline    Completed without error       00%     29522         -
# 5  Short offline       Completed without error       00%     29495         -
# 6  Short offline       Completed without error       00%     29472         -
# 7  Short offline       Completed without error       00%     29447         -
# 8  Short offline       Completed without error       00%     29421         -
# 9  Short offline       Completed without error       00%     29397         -
#10  Extended offline    Completed without error       00%     29386         -
#11  Short offline       Completed without error       00%     29373         -
#12  Short offline       Completed without error       00%     29350         -
#13  Short offline       Completed without error       00%     29326         -
#14  Short offline       Completed without error       00%     29301         -
#15  Short offline       Completed without error       00%     29278         -
#16  Short offline       Completed without error       00%     29254         -
#17  Short offline       Completed without error       00%     29230         -
#18  Short offline       Completed without error       00%     29207         -

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):       258 (0x0102)
Device State:                        Active (0)
Current Temperature:                    38 Celsius
Power Cycle Min/Max Temperature:     29/40 Celsius
Lifetime    Min/Max Temperature:      3/40 Celsius
Under/Over Temperature Limit Count:   0/0
Vendor specific:
01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

SCT Temperature History Version:     2
Temperature Sampling Period:         1 minute
Temperature Logging Interval:        1 minute
Min/Max recommended Temperature:      0/60 Celsius
Min/Max Temperature Limit:           -41/85 Celsius
Temperature History Size (Index):    478 (56)

Index    Estimated Time   Temperature Celsius
  57    2020-06-29 22:47    38  *******************
 ...    ..( 89 skipped).    ..  *******************
 147    2020-06-30 00:17    38  *******************
 148    2020-06-30 00:18    39  ********************
 ...    ..(  5 skipped).    ..  ********************
 154    2020-06-30 00:24    39  ********************
 155    2020-06-30 00:25    38  *******************
 ...    ..( 46 skipped).    ..  *******************
 202    2020-06-30 01:12    38  *******************
 203    2020-06-30 01:13    39  ********************
 ...    ..(  6 skipped).    ..  ********************
 210    2020-06-30 01:20    39  ********************
 211    2020-06-30 01:21    38  *******************
 ...    ..(158 skipped).    ..  *******************
 370    2020-06-30 04:00    38  *******************
 371    2020-06-30 04:01    39  ********************
 ...    ..(  6 skipped).    ..  ********************
 378    2020-06-30 04:08    39  ********************
 379    2020-06-30 04:09    38  *******************
 ...    ..( 78 skipped).    ..  *******************
 458    2020-06-30 05:28    38  *******************
 459    2020-06-30 05:29    39  ********************
 460    2020-06-30 05:30    39  ********************
 461    2020-06-30 05:31    38  *******************
 ...    ..( 72 skipped).    ..  *******************
  56    2020-06-30 06:44    38  *******************

SCT Error Recovery Control:
           Read:     70 (7.0 seconds)
          Write:     70 (7.0 seconds)

Device Statistics (GP/SMART Log 0x04) not supported

Pending Defects log (GP Log 0x0c) not supported

SATA Phy Event Counters (GP Log 0x11)
ID      Size     Value  Description
0x0001  2            0  Command failed due to ICRC error
0x0002  2            0  R_ERR response for data FIS
0x0003  2            0  R_ERR response for device-to-host data FIS
0x0004  2            0  R_ERR response for host-to-device data FIS
0x0005  2            0  R_ERR response for non-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
0x0008  2            0  Device-to-host non-data FIS retries
0x0009  2            1  Transition from drive PhyRdy to drive PhyNRdy
0x000a  2            1  Device-to-host register FISes sent due to a COMRESET
0x000b  2            0  CRC errors within host-to-device FIS
0x000f  2            0  R_ERR response for host-to-device data FIS, CRC
0x0012  2            0  R_ERR response for host-to-device non-data FIS, CRC
0x8000  4       507501  Vendor specific

My records show that this same disk has fallen offline twice in the past, once during a reboot and once out of the blue.

Given that there are no UDMA_CRC_Error_Count reported in the SMART results, is there any way this could be a cabling issue?

I have multiple, up to date backups and a burned in disk ready to use as a replacement if needed.

HW config:
Motherboard: Supermicro X10SRH-cF
CPU: E5-1650v4
RAM: 96GB
Storage: 8x WD Red WD40EFRX 4TB in RAIDZ2 (main pool)
8x WD Red WD40EFRX 4TB in RAIDZ2 (backup pool, replicated from main pool)
Boot SSD: SanDisk Plus 120GB
Chassis: Norco RPC-4224

 

[Spearfoot]

...
Given that there are no UDMA_CRC_Error_Count reported in the SMART results, is there any way this could be a cabling issue?
I have multiple, up to date backups and a burned in disk ready to use as a replacement if needed.
...

Given that the SMART results appear to be just fine, re-seating or replacing cables is the first thing to try.

 

[Kevin Horton]

Given that the SMART results appear to be just fine, re-seating or replacing cables is the first thing to try.

I'll shut the server down after the scrub has finished and reseat all cables related to this disk, then do a SMART long test.

 

[VioletDragon]

I'll shut the server down after the scrub has finished and reseat all cables related to this disk, then do a SMART long test.

Ive had a similuar issue as this. https://www.ixsystems.com/community...sage-attribute-5-reallocated_sector_ct.84734/

 

[Kevin Horton]

The routine scrub that finished a few hours ago cleared all the checksum errors. I reseated both ends of the data cable associated with that drive and also reseated the drive in the backplane. If the error occurs again I'll swap the drive with another on a different row to see if the issue follows the drive of stays with the drive slot.

A long SMART test is running now. I almost started it on the wrong drive, but remembered that a reboot could scramble the drive vs /dev/daX relationships. Sure enough, while the problem drive was /dev/da7, it is now /dev/da4 after the reboot.

 

[Spearfoot]

The routine scrub that finished a few hours ago cleared all the checksum errors. I reseated both ends of the data cable associated with that drive and also reseated the drive in the backplane. If the error occurs again I'll swap the drive with another on a different row to see if the issue follows the drive of stays with the drive slot.

A long SMART test is running now. I almost started it on the wrong drive, but remembered that a reboot could scramble the drive vs /dev/daX relationships. Sure enough, while the problem drive was /dev/da7, it is now /dev/da4 after the reboot.

Good plan; and good catch on the device IDs changing after reboot -- that bites me occasionally, too!

 

[Sasquatch]

Did reseating drives help?
I'm getting checksum errors too, on 2 drives, burning in(3days badblocks torture) finished without a hiccup.
A day after putting into service I have checksum errors on both drives, no sign of problems in SMART.
Can it be RAM(ECC ddr3) failing?, but other 2 drives behave themselves... strange

 

[sretalla]

Checksum errors would usually point to cabling or the controller (either onboard the disk or the SATA controller in the system).

Have you checked the SMART data for that disk already? If it's showing no checksum errors in there, check the cabling.

 

[Sasquatch]

Checksum errors would usually point to cabling or the controller (either onboard the disk or the SATA controller in the system).

Have you checked the SMART data for that disk already? If it's showing no checksum errors in there, check the cabling.

Thanks.
No errors logged in SMART for either drive.
smart long tests just finished without errors.
Wiped disks connectors with IPA and changed cables, scrubbing now.

 

[Kevin Horton]

Did reseating drives help?
I'm getting checksum errors too, on 2 drives, burning in(3days badblocks torture) finished without a hiccup.
A day after putting into service I have checksum errors on both drives, no sign of problems in SMART.
Can it be RAM(ECC ddr3) failing?, but other 2 drives behave themselves... strange

My issue was resolved by reseating the drive and data cable. No checksum errors since.