Creating a 3-disk RAID6 array

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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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