Increasing pg_num will lead to several slow requests and cluster freeze, but due to creating pgs operation , for what I’ve seen until now. During the creation period all the request are frozen , and the creation period take a lot of time even for 128 pgs.
I’ve observed that during creation period most of the OSD goes at 100% of their performance capacity. I think that without operation running in the cluster I’ll be able to upgrade pg_num quickly without causing down time several times. Matteo > Il giorno 02 gen 2017, alle ore 15:02, [email protected] ha scritto: > > Well, as the doc said: >> Set or clear the pause flags in the OSD map. If set, no IO requests will be >> sent to any OSD. Clearing the flags via unpause results in resending pending >> requests. > If you do that on a production cluster, that means your cluster will no > longer be in production :) > > Depending on your needs, but .. > Maybe you want do this operation as fast as possible > Or maybe you want to make that operation as transparent as possible, > from a user point of view > > You may have a look at osd_recovery_op_priority & > osd_client_op_priority, they might be interesting for you > > On 02/01/2017 14:37, Matteo Dacrema wrote: >> Hi All, >> >> what happen if I set pause flag on a production cluster? >> I mean, will all the request remain pending/waiting or all the volumes >> attached to the VMs will become read-only? >> >> I need to quickly upgrade placement group number from 3072 to 8192 or better >> to 165336 and I think doing it without client operations will be much faster. >> >> Thanks >> Regards >> Matteo >> >> >> >> >> _______________________________________________ >> ceph-users mailing list >> [email protected] >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > > _______________________________________________ > ceph-users mailing list > [email protected] > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > -- > Questo messaggio e' stato analizzato con Libra ESVA ed e' risultato non > infetto. > Seguire il link qui sotto per segnalarlo come spam: > http://mx01.enter.it/cgi-bin/learn-msg.cgi?id=9F3C956B85.A333A > > _______________________________________________ ceph-users mailing list [email protected] http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
