On Thu, 17 Jul 2014 06:38:42 +0000 Robert van Leeuwen wrote: > > > The good SSDs will report how much of their estimated life has been > > used. It's not in the SMART spec though, so different manufacturers do > > it differently (or not at all). > > > I'm planning to monitor those value, and replace the SSD when "gets > > old". I don't know exactly what that means yet, but I'll figure it out. > > It's easy to replace SSDs before they fail, without losing the whole > > OSD. > > We have a smallish cluster (3 nodes, 30TB RAW storage) with 6 Intel dc > S3500 120GB disks for journals. We have between 300-600Mbit of > continuous incoming data and lose a 2-3 percent of lifetime per week. I > would highly recommend to monitor this if you are not doing this > already ;) > > Buying bigger SSDs will help because the writes are spread across more > cells. So a 240GB drive should last 2x a 120GB drive. > > At that rate a DC3700 (instead of a bigger drive) will definitely be more attractive when it comes to $/TBW.
A 240GB DC3500 is rated for 140TBW and will cost about $240. A 200GB DC3700 is rated for 3650TBW and will cost about $380. Christian -- Christian Balzer Network/Systems Engineer [email protected] Global OnLine Japan/Fusion Communications http://www.gol.com/ _______________________________________________ ceph-users mailing list [email protected] http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
