On 27/12/14 20:32, Lindsay Mathieson wrote:
I see a lot of people mount their xfs osd's with nobarrier for extra
performance, certainly it makes a huge difference to my small system.
However I don't do it as my understanding is this runs a risk of data
corruption in the event of power failure - this is the case, even with ceph?
side note: How do I tell if my disk cache is battery backed? I have WD Red 3TB
(WD30EFRX-68EUZN0) with 64M cache, but no mention of battery backup in the
docs. I presume that means it isn't? :)
Yep. If you have 'em plugged into a RAID/HBA card with a battery backup
(that also disables their individual caches) then it is safe to use
nobarrier, otherwise data corruption will result if the server
experiences power loss.
Regards
Mark
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