I had a similar problem once. I traced my problem it to a failed battery on my RAID card, which disabled write caching. One of the many things I need to add to monitoring. On Tue, Aug 26, 2014 at 3:58 AM, <pawel.orzechowski at budikom.net> wrote: > Hello Gentelmen:-) > > Let me point one important aspect of this "low performance" problem: from > all 4 nodes of our ceph cluster only one node shows bad metrics, that is > very high latency on its osd's (from 200-600ms), while other three nodes > behave normaly, thats is latency of their osds is between 1-10ms. > > So, the idea of putting journals on SSD is something that we are looking > at, but we think that we have in general some problem with that particular > node, what affects whole cluster. > > So can the number (4) of hosts a reason for that? Any other hints? > > Thanks > > Pawel > > _______________________________________________ > ceph-users mailing list > ceph-users at lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.ceph.com/pipermail/ceph-users-ceph.com/attachments/20140826/cc6b941c/attachment.htm>
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