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?
Personally I’d just upgrade to RAIDZ2, and add as many disks to that as reasonably practical. To be honest, I fail to see any downsides to using four disks for this other than the storage inefficiency.
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Personally I’d just upgrade to RAIDZ2, and add as many disks to that as reasonably practical. To be honest, I fail to see any downsides to using four disks for this other than the storage inefficiency.