Re: [Veritas-bu] Destaging going slow
2010-07-13 09:52:40
We just suffered a double disk failure in a well-known commercial SATA storage array last weekend (sucks we were using RAID5). After recovering all of our data from tape, we have since moved the system to RAID6. Adam Leventhal has a great paper on this topic: http://queue.acm.org/detail.cfm?id=1670144 And I would highly recommended reading it. - Ryan From: veritas-bu-bounces AT mailman.eng.auburn DOT edu [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Lightner, Jeff Sent: Tuesday, June 29, 2010 10:53 AM To: veritas-bu AT mailman.eng.auburn DOT edu Subject: Re: [Veritas-bu] Destaging going slow +1 When I first got to this job we had a major outage of multiple environments because they’d all been built on a single RAID5 array that had a second disk fail while rebuilding the first disk that had failed. RAID10 will survive double disk failure. If you must do RAID5 make it into discreet sets so that the amount you lose in double-disk failure is manageable.
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Ed Wilts Sent: Tuesday, June 29, 2010 10:09 AM To: veritas-bu AT mailman.eng.auburn DOT edu Subject: Re: [Veritas-bu] Destaging going slow From a storage perspective, I've got all disks in a Dell MD1000 enclosure configured in a single 15 disk RAID-5.
Don't ever do this. Jonathan has obviously gotten away with this (so far) but using large drives (e.g. 1TB) in a 15-member RAID-5 set is just asking to lose the array due to a double-disk failure.
I've done several recoveries for our Windows Server Team because they're configured large RAID-5 sets and had double-disk failures.
../Ed
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