How to rebuild RAID without obstructing data migration?
I see why RAID rebuilds obstruct data migration. A RAID rebuild is NOT like backup and restore.
The rebuild consumes resources, e.g. CPU etc. So if we have the RAID on a separate system (managed by its own CPU) then: Surely this allows a RAID rebuild without obstructing data migration? Do you envisage other options to rebuild RAID without mega-impact on data migration? Or do we take the pain (i.e. wait until the RAID rebuild completed BEFORE starting the data migration?)
Thank you.
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ASKED:
November 25, 2008 9:39 PM
UPDATED:
July 21, 2009 6:52 PM
Answer Wiki:
I would definitely wait until the rebuild is complete before starting the data migration. The last thing you would want to happen is to have a storage processor (SP) panic duirng the rebuild, potentially causing data loss. We had a cascading panic (one SP panic which triggered the other SP to do the same)during a rebuild on a CX-500. Though we lost very little data, it took two weeks to recover and identify all the files that were 'in-flight' at the time.
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