FreeBSD ZFS replace faulted disk

log.txt

# Backup the the partitions geometry from another disk, rewrite the labels
(naz@celeri)~ % sudo gpart backup /dev/ada0 | sed -e 's/disk10/disk4/' -e 's/swap10/swap4/' > geom

# Restore the partitions geometry to the replacement disk
(naz@celeri)~ % sudo gpart restore -lF /dev/ada1 < geom

# Check
(naz@celeri)~ % sudo gpart show /dev/ada1
=>       34  976773101  ada1  GPT  (466G)
         34        128     1  freebsd-boot  (64K)
        162    8388608     2  freebsd-swap  (4.0G)
    8388770  968384365     3  freebsd-zfs  (462G)

(naz@celeri)~ % sudo gpart backup /dev/ada1
GPT 128
1   freebsd-boot        34       128
2   freebsd-swap       162   8388608 swap4
3    freebsd-zfs   8388770 968384365 disk4



# Enable swap if required
(naz@celeri)~ % sudo swapon /dev/gpt/swap4

# Get the name of the device to replace
(naz@celeri)~ % sudo zpool status -v zroot
  pool: zroot
 state: DEGRADED
status: One or more devices could not be opened.  Sufficient replicas exist for
        the pool to continue functioning in a degraded state.
action: Attach the missing device and online it using 'zpool online'.
   see: http://illumos.org/msg/ZFS-8000-2Q
  scan: scrub repaired 0 in 19h0m with 0 errors on Wed Sep 28 05:05:20 2016
config:

        NAME                      STATE     READ WRITE CKSUM
        zroot                     DEGRADED     0     0     0
          raidz1-0                DEGRADED     0     0     0
            14326764412051271881  UNAVAIL      0     0     0  was /dev/gpt/disk4
            gpt/disk6             ONLINE       0     0     0
            gpt/disk8             ONLINE       0     0     0
            gpt/disk10            ONLINE       0     0     0

errors: No known data errors

# Do the replacement
(naz@celeri)~ % sudo zpool replace zroot 14326764412051271881 /dev/gpt/disk4
Make sure to wait until resilver is done before rebooting.

If you boot from pool 'zroot', you may need to update
boot code on newly attached disk '/dev/gpt/disk4'.

Assuming you use GPT partitioning and 'da0' is your new boot disk
you may use the following command:

        gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 da0

# Update the boot code
(naz@celeri)~ % sudo gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 ada1
bootcode written to ada1

# Resilvering is in progress !!!
(naz@celeri)~ % zpool status -v zroot
  pool: zroot
 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 Tue Oct 11 14:56:04 2016
        28.6M scanned out of 315G at 574K/s, 159h45m to go
        6.95M resilvered, 0.01% done
config:

        NAME                        STATE     READ WRITE CKSUM
        zroot                       DEGRADED     0     0     0
          raidz1-0                  DEGRADED     0     0     0
            replacing-0             UNAVAIL      0     0     0
              14326764412051271881  UNAVAIL      0     0     0  was /dev/gpt/disk4/old
              gpt/disk4             ONLINE       0     0     0  (resilvering)
            gpt/disk6               ONLINE       0     0     0
            gpt/disk8               ONLINE       0     0     0
            gpt/disk10              ONLINE       0     0     0

errors: No known data errors