In my recent post you saw this:
[dan@r720-01 ~]$ zpool status zroot pool: zroot state: ONLINE scan: resilvered 818M in 0 days 00:00:09 with 0 errors on Tue Oct 15 21:32:12 2019 config: NAME STATE READ WRITE CKSUM zroot ONLINE 0 0 0 mirror-0 ONLINE 0 0 0 ada0p3 ONLINE 0 0 0 gpt/zfs1 ONLINE 0 0 0 errors: No known data errors [dan@r720-01 ~]$
I want to change ada0p3 to gpt/zfs0, as shown in this set of labels:
[dan@r720-01 ~]$ gpart show -l ada0 ada1
=> 40 156301408 ada0 GPT (75G)
40 1024 1 gptboot0 (512K)
1064 984 - free - (492K)
2048 4194304 2 swap0 (2.0G)
4196352 152104960 3 zfs0 (73G)
156301312 136 - free - (68K)
=> 40 156301408 ada1 GPT (75G)
40 1024 1 gptboot1 (512K)
1064 984 - free - (492K)
2048 4194304 2 swap1 (2.0G)
4196352 152104960 3 zfs1 (73G)
156301312 136 - free - (68K)
[dan@r720-01 ~]$
This is purely cosmetic.
detach
NOTE! This is a mirror. We must use detach and attach. Remember that. If you don’t do attach, you will end up with a stripe, not a mirror. You probably don’t want that.
[dan@r720-01 ~]$ sudo zpool detach zroot ada0p3
I should have done a status there, but I didn’t.
attach
We must do an attach, to create a mirror.
[dan@r720-01 ~]$ sudo zpool attach zroot /dev/gpt/zfs1 /dev/gpt/zfs0 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/zfs0'. 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 [dan@r720-01 ~]$
In this case, we do not have to do that bootcode command because we know we have done that.
status
The status immediately after is:
[dan@r720-01 ~]$ zpool status zroot pool: zroot state: ONLINE 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 15 22:04:26 2019 819M scanned at 273M/s, 231M issued at 77.1M/s, 819M total 223M resilvered, 28.25% done, 0 days 00:00:07 to go config: NAME STATE READ WRITE CKSUM zroot ONLINE 0 0 0 mirror-0 ONLINE 0 0 0 gpt/zfs1 ONLINE 0 0 0 gpt/zfs0 ONLINE 0 0 0 errors: No known data errors
Good. This is what we want.
3 seconds later, it was done.
But want, there’s more!
Now the drives are in the wrong order! I want zfs0/zfs1.
This is entirely cosmetic and makes no difference to the system at all.
Let’s try this again, removing the other drive:
[dan@r720-01 ~]$ sudo zpool detach zroot gpt/zfs1 [dan@r720-01 ~]$ zpool status zroot pool: zroot state: ONLINE scan: resilvered 819M in 0 days 00:00:10 with 0 errors on Tue Oct 15 22:04:36 2019 config: NAME STATE READ WRITE CKSUM zroot ONLINE 0 0 0 gpt/zfs0 ONLINE 0 0 0 errors: No known data errors [dan@r720-01 ~]$ sudo zpool attach zroot /dev/gpt/zfs0 /dev/gpt/zfs1 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/zfs1'. 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 [dan@r720-01 ~]$ zpool status zroot pool: zroot state: ONLINE 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 15 22:11:33 2019 819M scanned at 409M/s, 178M issued at 89.1M/s, 819M total 170M resilvered, 21.74% done, 0 days 00:00:07 to go config: NAME STATE READ WRITE CKSUM zroot ONLINE 0 0 0 mirror-0 ONLINE 0 0 0 gpt/zfs0 ONLINE 0 0 0 gpt/zfs1 ONLINE 0 0 0 errors: No known data errors [dan@r720-01 ~]$
There! Done.
Thank you for flying Air Cosmetic.
