Category: zfs

Clear checksum error in FreeNAS/TrueNAS

Posted on by Bian Xi Leave a Comment on Clear checksum error in FreeNAS/TrueNAS

Clear checksum error in FreeNAS/TrueNAS

Identify error

Errors can be found in TrueNAS Storage section in web page, or use shell in web page, run zpool status -x command.

Sample error can be fond in following screen. There are two pools got error. The pool0 got two hard disks, first one got 154 checksum errors, second one got one data error.

  pool: pool0
 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 00:00:02 with 0 errors on Sat Oct  2 17:39:46 2021
config:

    NAME                                            STATE     READ WRITE CKSUM
    pool0                                           ONLINE       0     0     0
      mirror-0                                      ONLINE       0     0     0
        gptid/bf410fcf-2209-11ec-b8aa-001132dbfc9c  ONLINE       0     0   154
        gptid/bfcc498a-2209-11ec-b8aa-001132dbfc9c  ONLINE       0     0     0

errors: No known data errors

  pool: pool01
 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: https://openzfs.github.io/openzfs-docs/msg/ZFS-8000-8A
config:

    NAME                                          STATE     READ WRITE CKSUM
    pool01                                        ONLINE       0     0     0
      gptid/75827da1-207a-11ec-afcf-005056a390b2  ONLINE       0     0     1
errors: List of errors unavailable: permission denied

errors: 1 data errors, use '-v' for a list

For second error, impacted file can be found using zpool status -v command

root@truenas[~]# zpool status -v pool01
  pool: pool01
 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: https://openzfs.github.io/openzfs-docs/msg/ZFS-8000-8A
  scan: scrub repaired 0B in 00:23:22 with 1 errors on Sat Oct  2 21:53:02 2021
config:

        NAME                                          STATE     READ WRITE CKSUM
        pool01                                        ONLINE       0     0     0
          gptid/75827da1-207a-11ec-afcf-005056a390b2  ONLINE       0     0     1

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

        /mnt/pool01/download/file.1
root@truenas[~]#

Clear error

Run following command to clear the error

zpool clear <pool_name>

For the pool has data error, which has any file impacted. Delete or overwrite the file.

Then scrub the pool

zpool scrub <pool_name>

Replace disk

To replace disk, run following command, c0t0d2 is a new disk to replace c0t0d0

zpool replace c0t0d0 c0t0d2

If the disk replaced at same location, then run following command

zpool replace c0t0d0

Migrate Storage from FreeNAS/TrueNAS Core to TrueNAS Scale

Posted on by Bian Xi Leave a Comment on Migrate Storage from FreeNAS/TrueNAS Core to TrueNAS Scale

Migrate Storage from FreeNAS/TrueNAS Core to TrueNAS Scale

Consideration

FreeNAS/TrueNAS Core is using FreeBSD OS, which doesn't support docker and KVM, it uses bhyve as Hyperviser. In order to use docker, requires VM to be installed, such as Rancher OS VM, which is an overhead of the system.

TrueNAS Scale is developed under Debian, and which is still under beta version. In order to use more features under virtualization, TrueNAS Scale is considered to be used.

Reinstall TrueNAS Scale

Installation of TrueNAS Scale is slower than TrueNAS Core, network configuration is different too.

Network

Network aggregation configuration for failover, could not select active and stand by interface. Need to find out more on this configuration.

Import TureNAS Core storage

ZFS pool can be installed easily.

Rename zpool name and dataset

To change the pool name, can use shell to import and export before use GUI import. Following commands can be used

zpool import pool_old pool_new
zpool export pool_new
zpool import pool_new
zfs rename old_name new_name
zpool export pool_new