this post was submitted on 21 Aug 2025
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Funny you should mention that, because it's what got me thinking about Ceph in the first place. My other Proxmox node has a 2-drive mirrored ZFS pool, and I went to add a third drive to it and realized that I'd have to move all the data off and rebuild it from scratch, so I started looking for other solutions.
So yeah, I think Ceph can add to an array after-the-fact like that (in addition to the not-waste-capacity-of-random-assorted-disks thing), but I haven't figured it out enough yet to be sure.
I also totally was mixing up Ceph with ZFS. Linux tech mentions ZFS a lot. That’s the source of most of my RAID knowledge lol