Hi all, I have the same problem, just curious. could it be caused by poor hdd performance ? read/write speed doesn't match the network speed ?
Currently i'm using desktop hdd in my cluster. Rgrds, Rzk On Tue, Oct 29, 2013 at 6:22 AM, Kyle Bader <kyle.ba...@gmail.com> wrote: > You can change some OSD tunables to lower the priority of backfills: > > osd recovery max chunk: 8388608 > osd recovery op priority: 2 > > In general a lower op priority means it will take longer for your > placement groups to go from degraded to active+clean, the idea is to > balance recovery time and not starving client requests. I've found 2 > to work well on our clusters, YMMV. > > On Mon, Oct 28, 2013 at 10:16 AM, Kevin Weiler > <kevin.wei...@imc-chicago.com> wrote: > > Hi all, > > > > We have a ceph cluster that being used as a backing store for several VMs > > (windows and linux). We notice that when we reboot a node, the cluster > > enters a degraded state (which is expected), but when it begins to > recover, > > it starts backfilling and it kills the performance of our VMs. The VMs > run > > slow, or not at all, and also seem to switch it's ceph mounts to > read-only. > > I was wondering 2 things: > > > > Shouldn't we be recovering instead of backfilling? It seems like > backfilling > > is much more intensive operation > > Can we improve the recovery/backfill performance so that our VMs don't go > > down when there is a problem with the cluster? > > > > > > -- > > > > Kevin Weiler > > > > IT > > > > > > > > IMC Financial Markets | 233 S. Wacker Drive, Suite 4300 | Chicago, IL > 60606 > > | http://imc-chicago.com/ > > > > Phone: +1 312-204-7439 | Fax: +1 312-244-3301 | E-Mail: > > kevin.wei...@imc-chicago.com > > > > > > ________________________________ > > > > The information in this e-mail is intended only for the person or entity > to > > which it is addressed. > > > > It may contain confidential and /or privileged material. If someone other > > than the intended recipient should receive this e-mail, he / she shall > not > > be entitled to read, disseminate, disclose or duplicate it. > > > > If you receive this e-mail unintentionally, please inform us immediately > by > > "reply" and then delete it from your system. Although this information > has > > been compiled with great care, neither IMC Financial Markets & Asset > > Management nor any of its related entities shall accept any > responsibility > > for any errors, omissions or other inaccuracies in this information or > for > > the consequences thereof, nor shall it be bound in any way by the > contents > > of this e-mail or its attachments. In the event of incomplete or > incorrect > > transmission, please return the e-mail to the sender and permanently > delete > > this message and any attachments. > > > > Messages and attachments are scanned for all known viruses. Always scan > > attachments before opening them. > > > > _______________________________________________ > > ceph-users mailing list > > ceph-users@lists.ceph.com > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > > > -- > > Kyle > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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