Hi,
is there any specific reason why md refuses to create a RAID6 array with
3 disks? My (probably naive) understanding suggests it should be the
same as a 3-disk RAID1, similar to a 2-disk RAID5.
The reason I'm asking is that I currently have space on three disks for
a new array, and would like to expand it when I add a fourth. I tried
this scenario with a few loopback devices, but the only way to go from a
3-disk RAID1 to a 4-disk RAID6 seems to be via an intermediate 3-disk
RAID5, requiring two reshapes. I'd like to avoid one of them, if at all
possible.
Regards,
Oliver
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