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Set up raidZ-1 with 3 drives and existing data (feddit.org)

submitted 4 days ago* (last edited 4 days ago) by [email protected] to c/selfhosted

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I currently have a two disk-zfs mirror which has been filling up recently. So I decided to buy anothet drive, but when I started thinking about it, I was unsure on how to actually make it usable. The issue is that I have ~11Tb on the existing pool (2 12 Tb drives (a,b)) and no spare drives of that size to copy over all my data to while creating the new 3-drive pool with the same drives and the additional new drive (c).

I saw there is a way to create a "broken" pool with just two drives (a,b), while keeping the data on the remaining drive (c), then copying the data over to the pool and 'reparing' it afterwards with the new drive (c).

As I only have 11 Tb of data which would theoretically fit one disk, would I be able to:

keep the old pool
initialize the new pool with just one drive and copy over the data
detach one drive from the old pool, add it to the new pool (if possible, would there allready be parity data generated on this drive at that point? Wold the parity be generated in a way that would allow me to lose the other drive in the pool and recover the data from the remaining pool (drive) alone?)
destroy old pool, add last drive to new pool

I would be able to back up my important data, but don't have enogh space to also back up my media library which I'd like to not have to rebuild.

alternatively: anyone in Berlin wanna loan me a 12 Tb drive?

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[–] [email protected] 2 points 3 days ago (1 children)

Sounds interesting, but while I have room for one more drive, I don't want to spend money for one more drive xD (As mentioned, I have >= 12Tb drives, so another one I don't really need would hurt the wallet quite a bit.)

[–] one_knight_scripting 2 points 3 days ago

That is totally fair. Actually I just upgraded to 12 TB drives and that's why I'm working on this. So huge props to your design choice. Also props for using zfs, I feel like it flies under the radar a lot.