Kevin Weiler schrieb: > Thanks Kyle, > > What's the unit for osd recovery max chunk? Have a look at http://ceph.com/docs/master/rados/configuration/osd-config-ref/ where all the possible OSD config options are described, especially have a look at the backfilling and recovery sections. > > Also, how do I find out what my current values are for these osd options? Have a look at http://ceph.com/docs/master/rados/configuration/ceph-conf/#viewing-a-configuration-at-runtime
Best regards, Kurt > > -- > > 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 > > > > > > > > On 10/28/13 6:22 PM, "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 > > > ________________________________ > > 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 -- Kurt Bauer <kurt.ba...@univie.ac.at> Vienna University Computer Center - ACOnet - VIX Universitaetsstrasse 7, A-1010 Vienna, Austria, Europe Tel: ++43 1 4277 - 14070 (Fax: - 9140) KB1970-RIPE
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