My cluster is actually very fast without SSD drives. Thanks for the advice! Michael Kuriger mk7193@xxxxxx 818-649-7235 MikeKuriger (IM) On 11/25/14, 7:49 AM, "Mark Nelson" <mark.nelson@xxxxxxxxxxx> wrote: >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 >> >>https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.ceph.com_listin >>fo.cgi_ceph-2Dusers-2Dceph.com&d=AAICAg&c=lXkdEK1PC7UK9oKA-BBSI8p1AamzLOS >>ncm6Vfn0C_UQ&r=CSYA9OS6Qd7fQySI2LDvlQ&m=xAjtZHPapVvnusxPYRk6BsgVfaL1ZLDaT >>ojJmuDFDpQ&s=F0CBA8T3LuTIhofIV4LGk-6CgC8KsPAu-7JgJ4jRm3I&e= >> > >_______________________________________________ >ceph-users mailing list >ceph-users@xxxxxxxxxxxxxx >https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.ceph.com_listinf >o.cgi_ceph-2Dusers-2Dceph.com&d=AAICAg&c=lXkdEK1PC7UK9oKA-BBSI8p1AamzLOSnc >m6Vfn0C_UQ&r=CSYA9OS6Qd7fQySI2LDvlQ&m=xAjtZHPapVvnusxPYRk6BsgVfaL1ZLDaTojJ >muDFDpQ&s=F0CBA8T3LuTIhofIV4LGk-6CgC8KsPAu-7JgJ4jRm3I&e= _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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