[zfs-discuss] ZFS Scrub - Checksum errors with snapshots of URBackup filesystem

St├ęphane BOCQUET stephane at famille-bocquet.fr
Mon Dec 10 05:06:49 EST 2018

Hi all,

I'm facing something strange with my ZFS pool.

My server is Debian 9.x (Linux home-server 4.16.0-0.bpo.1-amd64 #1 SMP Debian 4.16.5-1~bpo9+1 (2018-05-06) x86_64 GNU/Linux) with the ZoL v0.7.11 (Loaded module v0.7.11-1~bpo9+1, ZFS pool version 5000, ZFS filesystem version 5).

Every month I run a scrub and I always have some checksum errors. The strange thing is that the errors are always on snapshots of my URBackup filesystem. It happens since the day I start using ZFS, with several version of kernel or ZoL version (0.7.6, ans so on...). No other filesystem and/or snapshot is touch.

Ths FS is probably the most used of the server as my PC backups are running every evening. The others are used for storage with less reads/writes.

root at home-server:~# zpool status -v

  pool: StoragePool

state: ONLINE

status: One or more devices has experienced an error resulting in data

        corruption.  Applications may be affected.

action: Restore the file in question if possible.  Otherwise restore the

        entire pool from backup.

   see: http://zfsonlinux.org/msg/ZFS-8000-8A

  scan: scrub repaired 184K in 22h21m with 4 errors on Mon Dec 10 00:51:13 2018


        NAME                                          STATE     READ WRITE CKSUM

        StoragePool                                   ONLINE       0     0     2

          raidz2-0                                    ONLINE       0     0     4

            ata-WDC_WD20EZRX-00DC0B0_WD-WMC301141384  ONLINE       0     0     1

            ata-WDC_WD20EZRX-00DC0B0_WD-WMC300977122  ONLINE       0     0     1

            ata-WDC_WD20EZRX-00DC0B0_WD-WMC300905426  ONLINE       0     0     0

            ata-WDC_WD20EZRX-00DC0B0_WD-WMC300979172  ONLINE       0     0     2

            ata-ST2000DM001-1ER164_W4Z2AWC6           ONLINE       0     0     3

            ata-ST2000DM001-1ER164_Z4Z69EHC           ONLINE       0     0     0

            ata-ST2000DM001-1ER164_Z560B0EA           ONLINE       0     0     0

errors: Permanent errors have been detected in the following files:

        StoragePool/Backups at zfs-auto-snap_daily-2018-11-23-0043:/HOME-DESKTOP/181122-2157_Image_C/Image_C_181122-2157.vhdz<mailto:StoragePool/Backups at zfs-auto-snap_daily-2018-11-23-0043:/HOME-DESKTOP/181122-2157_Image_C/Image_C_181122-2157.vhdz>

        StoragePool/Backups at zfs-auto-snap_weekly-2018-11-06-0044:<0x42e824>

        StoragePool/Backups at zfs-auto-snap_weekly-2018-11-06-0044:/HOME-DESKTOP/.directory_pool/Xa/XafT8R5Nwz15384263132339451170/FileRepository/nv_dispi.inf_amd64_3baaab0007230109/NvCplSetupInt.exe<mailto:StoragePool/Backups at zfs-auto-snap_weekly-2018-11-06-0044:/HOME-DESKTOP/.directory_pool/Xa/XafT8R5Nwz15384263132339451170/FileRepository/nv_dispi.inf_amd64_3baaab0007230109/NvCplSetupInt.exe>

        StoragePool/Backups at zfs-auto-snap_daily-2018-11-12-0007:/HOME-DESKTOP/181111-2245/C/ProgramData/NVIDIA Corporation/Downloader/682583b8794b3a4367cba3a8b13f8223/416.34-desktop-win10-64bit-international-whql-g.exe

Of course, if I delete the snapshots and run another scrub; there's no more errors but they will come back next month...

To be complete, I never lost any data at the moment... but I'm always a little anxious when the scrub date is coming.

Any idea to help me?

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