On Sat, 2 Mar 2013, Phil Turmel wrote:
I agree. And the file copy to the raid5 would almost certainly run faster than any raid6 with "missing". Then the reshape is one operation to both expand the drive count and switch to raid6.
If he's running 2.6.32 that option isn't available (if I remember correctly). Since he didn't disclose what mdadm and kernel version he was running, I suggested the safest path that works on most kernels and mdadm versions.
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