How to fix my ZFS pool mistakes (lemm.ee)

submitted 3 months ago by abies_exarchia@lemm.ee to c/selfhosted@lemmy.world

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Back when I was even less experienced in self-hosting I setup my media/backup server using a RAIDZ1 array and 3 x 8TB disks. It's been running well for a while and I haven't had any problems and no disk errors.

But today I read a post about 'pool design rules' stating that RAIDZ1 configurations should not have drives over 1TB because the chances of errors occurring during re-silvering are high. I wish I had known this sooner.

What can I do about this? I send ZFS snapshots to 2 single large (18TB) hardrives for cold backups, so I have the capacity to do a migration to a new pool layout. But which layout? The same article I referenced above says to not use RAIDZ2 or RAIDZ3 with any less than 6 drives...I don't want to buy 3 more drives. Do I buy an additional 8TB drive (for a total of 4 x 8TB) and stripe across two sets of mirrors? Does that make any sense?

Thank you!

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[-] czech@lemm.ee 5 points 3 months ago

Those failure rates are nonsense based on theoretical limits. In practice: a few weeks ago I resilvered a 4 disk z1 array with 8tb disks at 85% capacity in less than 24 hours. I scrub the pool every month and it didn't seem any more taxing than a scrub.

this post was submitted on 26 Mar 2024

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