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One disk of my 2-disk-RAID1-stack has failed and I'm about to replace it.

Is the volume usable—i.e. can I read & write just as I normally could—while Disk Utility is rebuilding the RAID?

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Yes, rebuilding happens in the background and the volume can be accessed normally.

I/O performance might be affected, but in my own experience it's more likely the rebuilding process that takes the performance-hit—i.e. rebuilding would be faster if the volume wasn't in use.

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