View source for Sostituzione di un disco danneggiato in un pool ZFS

* I dischi nel pool sono identificati by-path
* Un disco si è danneggiato, ed è stato sostituito fisicamente nella stessa posizione:

<pre>
# zpool status
  pool: BACKUP
 state: DEGRADED
status: One or more devices could not be used because the label is missing or
        invalid.  Sufficient replicas exist for the pool to continue
        functioning in a degraded state.
action: Replace the device using 'zpool replace'.
   see: http://zfsonlinux.org/msg/ZFS-8000-4J
  scan: scrub repaired 0B in 1 days 21:06:18 with 0 errors on Mon Jan 11 21:30:26 2021
config:

        NAME                        STATE     READ WRITE CKSUM
        BACKUP                  DEGRADED     0     0     0
          mirror-0                  DEGRADED     0     0     0
            7022246872819137128     UNAVAIL      0     0     0  was /dev/disk/by-path/pci-0000:00:1f.2-ata-4-part1
            pci-0000:00:1f.2-ata-3  ONLINE       0     0     0
          mirror-1                  ONLINE       0     0     0
            pci-0000:00:1f.2-ata-5  ONLINE       0     0     0
            pci-0000:00:1f.2-ata-6  ONLINE       0     0     0

errors: No known data errors
</pre>

* Sostituire l'UUID con il disco nuovo:

 zpool replace BACKUP 7022246872819137128 /dev/disk/by-path/pci-0000\:00\:1f.2-ata-4

*Durante la sostituzione si vedrà:

<pre>
  pool: BACKUP
 state: DEGRADED
status: One or more devices is currently being resilvered.  The pool will
	continue to function, possibly in a degraded state.
action: Wait for the resilver to complete.
  scan: resilver in progress since Wed Jan 20 10:42:10 2021
	57.7G scanned at 19.2M/s, 16.4G issued at 5.47M/s, 5.27T total
	20.4G resilvered, 0.30% done, no estimated completion time
config:

	NAME                          STATE     READ WRITE CKSUM
	BACKUP                    DEGRADED     0     0     0
	  mirror-0                    DEGRADED     0     0     0
	    replacing-0               DEGRADED     0     0     0
	      7022246872819137128     UNAVAIL      0     0     0  was /dev/disk/by-path/pci-0000:00:1f.2-ata-4-part1/old
	      pci-0000:00:1f.2-ata-4  ONLINE       0     0     0  (resilvering)
	    pci-0000:00:1f.2-ata-3    ONLINE       0     0     0
	  mirror-1                    ONLINE       0     0     0
	    pci-0000:00:1f.2-ata-5    ONLINE       0     0     0
	    pci-0000:00:1f.2-ata-6    ONLINE       0     0     0

errors: No known data errors

</pre>

* Alla fine tutto ritorna alla normalità.