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I have to build a RAID 6 with the following 3 requirements:
- Use different kinds of disks with different sizes.
- When a disk fails and there's enough space, the RAID should be able to reconstruct itself out of the degraded state. Meaning, if I have e. g. a RAID with 8 disks and 1 fails, I should be able to chose to transform this in a non-degraded (!) RAID with 7 disks.
- Also the other way round: If I add a disk of what size ever, it should redistribute the data, so that it becomes a RAID with 9 disks.
I don't care, if I have to do it manually.
I don't care so much about speed either.
Is RAIDz capable of doing that? Btrfs, unRAID, SnapRAID or FlexRAID? What RAID system would be able to do that?
Thanks a lot for your help!