On 11/25/2014 09:41 AM, Erik Logtenberg wrote:
If you are like me, you have the journals for your OSD's with rotating media stored separately on an SSD. If you are even more like me, you happen to use Intel 530 SSD's in some of your hosts. If so, please do check your S.M.A.R.T. statistics regularly, because these SSD's really can't cope with Ceph. Check out the media-wear graphs for the two Intel 530's in my cluster. As soon as those declining lines get down to 30% or so, they need to be replaced. That means less than half a year between purchase and end-of-life :( Tip of the week, keep an eye on those statistics, don't let a failing SSD surprise you.
This is really good advice, and it's not just the Intel 530s. Most consumer grade SSDs have pretty low write endurance. If you mostly are doing reads from your cluster you may be OK, but if you have even moderately high write workloads and you care about avoiding OSD downtime (which in a production cluster is pretty important though not usually 100% critical), get high write endurance SSDs.
Mark
Erik. _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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