Thanks for the comments.
Let's take the following example:
1) 2 RAID1 + 1 spare
(A + B) + C
2) 3 RAID1
(A + B + C)
At least in normal operation case, case 1) makes device C useless, and
Yes.
For case 2), we can just relocate and recover the bad chunks in B.
It it should only need to copy 6G data.
Case 2 is Wrong in the context of spare.
Unless space usage is limited to 1/3 of total space.
But when you do that, case 1 drawback will equally apply
to case 2 as well.
> It it should only need to copy 6G data.
Its true as long as you don't replace the failed B
and bring the configuration to its original. However
when you do that, Data moved will be more than case 1.
So this is not fully correct.
Thanks, Anand
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