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SearchStorageATE
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Q:
How to rebuild RAID without obstructing data migration?
Storage management, RAID, Redundant Array of Inexpensive Disks, Data migration, RAID rebuild
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.
ASKED: Nov 25 2008  9:39 PM GMT
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SANManJax
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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.
Last Answered: Jul 21 2009  6:52 PM GMT by SANManJax   300 pts.
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IT Knowledge Exchange Community Update for 12/02/08 - ITKE Community Blog   0 pts.  |   Dec 2 2008  6:01PM GMT

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