If I have a ZFS Mirror share in an old box and then take those 2 drives to a new Unraid box with a 1 array disk : 1 Parity config, would it just work (No Parity Sync required?)

 

Seems like it should.

 

Edited May 24, 20242 yr by foo_fighter

If you mean doing that would import you pool, it won't, it may be possible to import the mirror as a pool, depending on how it was created, but not in the array.

I meant move from a zfs pool of 2 disks to a standard unraid array with 2 disks, 1 ZFS formatted data disk and 1 Parity disk. In the 2 disk special case, each drive is a mirror with identical information on each disk(you could swap the parity and data disk and it would be the same).  My thought was that in a 2 disk ZFS mirror the data should also be identical on each disk unless ZFS does things differently. 

 

 

 

 

If you do that it will work as a mirror, but it won't be a the same as mirrored zfs pool, important you understand the differences.

4 hours ago, foo_fighter said:

unless ZFS does things differently. 

The data is mirrored (maybe not necessarily 1:1 on the exact same drive bits?) and metadata will differ since zfs knows it is supposed to be a 2-drive pool, is able to know a disk is missing and which. If you put that in the array the single data drive might mount but as a degraded 2-drive pool.

Edited May 25, 20242 yr by Kilrah

Ahh, I think it won't work then. I was trying to save some time by copying the data in an existing machine to a new array before moving to a new machine(I don't have the hardware yet) as a backup server. I guess I would need the 2 arrays feature that's not yet implemented.

 

An old post suggested creating an unraid virtual machine and passing the second set of drives into a new array under that virtual machine. 

Edited May 25, 20242 yr by foo_fighter