On 12/08/15 18:58, Hans Malissa wrote:

Can a RAID1 array be used/mounted while it’s rebuilding?

Yes.

But don't take my word for it: you can test it by setting up a test
array on a couple of loop devices and play around with
failing/removing/adding components to it while the array is mounted. Of
course you need to have at least one active device that's fully in sync
at all times.
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