Adding disk to ZFS RAIDZ Pool

[bowlander]

Hey all,

Total noob here looking for some advice. About two years ago I set up what I believed to be a RAIDZ pool with only one disk with the purpose of purchasing two more disks at a later date to add (if this is even possible, I believed it to be at the time). Well I just purchased those two disks today and now am I wondering how to go about adding these disks to the pool without destroying everything if at all possible.

pool: MAIN
state: ONLINE
scan: scrub repaired 0B in 00:21:24 with 0 errors on Sun Jun 9 00:45:25 2024
config:

NAME STATE READ WRITE CKSUM
MAIN ONLINE 0 0 0
ata-Samsung_SSD_870_EVO_2TB_S753NS0X203083N ONLINE 0 0 0

It doesn't appear to say what type of ZFS pool it is i'm assuming because a single drive ZFS RAIDZ pool is impossible. Any suggestions or help greatly appreciated.

EDIT - An important piece of information I think i missed is that this pool is just a storage pool and I have a seperate two disk mirrored pool for proxmox itself

 

[_gabriel]

afaik, only add a mirror disk to your current single disk is possible and zfs mirror is recommended for perf.
be careful to monitor wear level, because zfs writes many many more data than real data because write amplification and integrity features.
Datacenter disks are recommended for endurance and for performances thanks to PLP.

 

[Dunuin]

I set up what I believed to be a RAIDZ pool with only

Then its a single disk vdev and not a raidz (which would be the equivalent of a raid5).

Well I just purchased those two disks today and now am I wondering how to go about adding these disks to the pool without destroying everything if at all possible.

You can't. Backup everything, destroy that pool, recreate it as a 3-disk raidz and do a restore. But be aware that you won't be able to add a 4th/5th disk later (yet).