I realize it's only recently become possible, via the new zfs raid-z vdev expansion feature:
https://github.com/openzfs/zfs/pull/12225
https://freebsdfoundation.org/blog/raid-z-expansion-feature-for-zfs/
https://louwrentius.com/zfs-raidz-expansion-is-awesome-but-has-a-small-caveat.html
Using Ubuntu 22.04.1 LTS (jammy) & OpenZFS via zfsutils-linux version 2.1.4-0ubuntu0.1 (as reported by dpkg -l | grep zfsutils). Use case is a home Samba NAS.
Starting with a 6 drive zpool pulled from an older machine (zpool import) and have run zpool upgrade -a
bob@nas:~$ zpool status
pool: tank
state: ONLINE
scan: resilvered 1.46M in 00:00:02 with 0 errors on Wed Sep 21 12:06:07 2022
config:
NAME STATE READ WRITE CKSUM
tank ONLINE 0 0 0
raidz2-0 ONLINE 0 0 0
wwn-0x5000c50063d584b2 ONLINE 0 0 0
wwn-0x5000c50090e6b172 ONLINE 0 0 0
wwn-0x5000c50063dde13d ONLINE 0 0 0
wwn-0x5000c50063d6e22c ONLINE 0 0 0
wwn-0x5000c50063d6b472 ONLINE 0 0 0
wwn-0x5000c50063d965df ONLINE 0 0 0
errors: No known data errors
Good so far...
I've added two additional drives to the system (total of 8), identical size & model to drives above. Linux sees the two added drives (for a total of 8) as sdf & sdg
I'd expected to expand raidz2-0 adding the two new disks via this cmd for each new drive:
bob@nas:/tank/public$ sudo zpool attach -f tank raidz2-0 {drivename}
cannot attach {drivename} to raidz2-0: can only attach to mirrors and top-level disks
What am I doing wrong here?
Thanks!
Bob
