Thanks for reply. If the OSD represents the primary one for a PG, then all IO will be stopped..which may lead to application failure.. On Tue, Jan 22, 2019 at 5:32 PM Matthew Vernon <mv3@xxxxxxxxxxxx> wrote: > > Hi, > > On 22/01/2019 10:02, M Ranga Swami Reddy wrote: > > Hello - If an OSD shown as down and but its still "in" state..what > > will happen with write/read operations on this down OSD? > > It depends ;-) > > In a typical 3-way replicated setup with min_size 2, writes to placement > groups on that OSD will still go ahead - when 2 replicas are written OK, > then the write will complete. Once the OSD comes back up, these writes > will then be replicated to that OSD. If it stays down for long enough to > be marked out, then pgs on that OSD will be replicated elsewhere. > > If you had min_size 3 as well, then writes would block until the OSD was > back up (or marked out and the pgs replicated to another OSD). > > Regards, > > Matthew > > > -- > The Wellcome Sanger Institute is operated by Genome Research > Limited, a charity registered in England with number 1021457 and a > company registered in England with number 2742969, whose registered > office is 215 Euston Road, London, NW1 2BE. > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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