ZFS failures detected on belvedere

Several defaults were detected on the zfs pool on belvedere this night (2021-03-03) (migrated/migration$962)

This is the current pool status :

root@belvedere:~# zpool status -v data
  pool: data
 state: DEGRADED
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 0B in 0 days 03:14:42 with 33 errors on Wed Mar  3 03:38:44 2021
remove: Removal of vdev 3 copied 1.23T in 5h35m, completed on Tue Dec 15 19:28:52 2020
    88.3M memory used for removed device mappings
config:

	NAME                        STATE     READ WRITE CKSUM
	data                        DEGRADED     0     0     0
	  mirror-0                  ONLINE       0     0     0
	    wwn-0x50000397bc8969c1  ONLINE       0     0     0
	    wwn-0x50000396dc8a2191  ONLINE       0     0     0
	  mirror-1                  DEGRADED     0     0     0
	    wwn-0x500003965c898904  DEGRADED     0     0    12  too many errors
	    wwn-0x500003965c898910  DEGRADED     0     0    12  too many errors
	  mirror-5                  DEGRADED     0     0     0
	    wwn-0x50000396dc8a2161  DEGRADED     0     0    46  too many errors
	    wwn-0x500003972c8a44d1  DEGRADED     0     0    46  too many errors
	  mirror-6                  ONLINE       0     0     0
	    wwn-0x50000396dc8a2185  ONLINE       0     0     8
	    wwn-0x50000397bc8969b1  ONLINE       0     0     8
	  mirror-7                  ONLINE       0     0     0
	    wwn-0x5002538c409a8258  ONLINE       0     0     0
	    wwn-0x5002538c40ba6713  ONLINE       0     0     0
	  mirror-8                  ONLINE       0     0     0
	    wwn-0x5002538c409a825a  ONLINE       0     0     0
	    wwn-0x5002538c40ba66ab  ONLINE       0     0     0
	  mirror-9                  ONLINE       0     0     0
	    wwn-0x5002538c409a8252  ONLINE       0     0     0
	    wwn-0x5002538c409a8256  ONLINE       0     0     0
	  mirror-10                 ONLINE       0     0     0
	    wwn-0x5002538c40ba6716  ONLINE       0     0     0
	    wwn-0x5002538c409a8253  ONLINE       0     0     0

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

        /srv/softwareheritage/postgres/11/indexer/base/16406/774467031.317
        /srv/softwareheritage/postgres/11/indexer/base/16406/774467031.180
        /srv/softwareheritage/postgres/11/indexer/base/16406/774467031.110
        /srv/softwareheritage/postgres/11/indexer/base/16406/774467031.316

(more information on a previous identical issue on #2892 (closed))

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Migrated from T3081 (view on Phabricator)