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Ext3 and RAID: silent data killers?

Ext3 and RAID: silent data killers?

Posted Sep 3, 2009 5:26 UTC (Thu) by dlang (subscriber, #313)
In reply to: Ext3 and RAID: silent data killers? by k8to
Parent article: Ext3 and RAID: silent data killers?

actually, if you have a read-mostly workload raid 5/6 can end up being as fast as raid 10. I couldn't believe this myself when I first ran into it, but I have a large (multiple TB) database used for archiving log data and discovered that read/search performance was the same with raid 6 as with raid 10.

in digging further I discovered that they key to performance was to have enough queries in flight to keep all disk heads fully occupied (one outstanding query per drive spindle), and you can do this with both raid 6 and raid 10.


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