Jeff Breidenbach wrote:
However you will endure a rebuild on md0 when you re-add the disk, but
given everything is mounted read-only, you should not practically be
doing anything
If the rebuild operation is a no-op, then that sounds like a great
idea. If the rebuild operation requires scanning over all data in both
drives, I think that's going to be at least as expensive as the
current 10 hour process.
You seem to be using a pretty bleeding edge kernel (2.6.12). If you were
to upgrade to 2.6.13, the md bitmap (intent logging) functionality that
is present in that kernel will allow the resync to be a no-op.
Basically, the bitmap tracks writes to the md array, and then when
resync occurs, only syncs blocks that have been written. Since the array
would be readonly while you're doing backups, there would be nothing to
resync.
See the list archives for more details on md bitmap.
--
Paul
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