On Wed, 2009-03-04 at 17:03 +0000, Daire Byrne wrote: > > Once you move to LVM then you can snapshot the MDT and mount that without > unmounting the production MDT. You should probably destroy the snapshot > afterwards as it affects performance somewhat.
And just to be absolutely clear for those who don't realize, as the number of snapshots of a single device increases so does the performance penalty. There is another snapshot technology at http://zumastor.org/ that claims to efficiently store snapshots to as not to suffer the same problems. I have yet to find the time to evaluate it though. b.
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