On Wed, May 18, 2016 at 6:04 PM, Goncalo Borges <goncalo.borges@xxxxxxxxxxxxx> wrote: > Dear All... > > Our infrastructure is the following: > > - We use CEPH/CEPHFS (9.2.0) > - We have 3 mons and 8 storage servers supporting 8 OSDs each. > - We use SSDs for journals (2 SSDs per storage server, each serving 4 OSDs). > - We have one main mds and one standby-replay mds. > - We are using ceph-fuse client to mount cephfs. > > We are on our way to prepare an upgrade to Jewel 10.2.1 since CephFS is > announced as production and ceph-fuse does has ACL support (which is > something we do need). > > I do have a couple questions regarding the upgrade procedure: > > 1) Can we jump directly from 9.2.0 to 10.2.1? Or should we go through all > the intermediate releases (9.2.0 --> 9.2.1 --> 10.2.0 --> 10.2.1)? This shouldn't be a problem; if it is the release notes will say so. :) > > 2) The upgrade procedure establishes that the upgrade order should be: 1) > MONS, 2) OSDs, 3) MDS and 4) Clients. > 2.1) Can I upgrade / restart each MON independently? Or should I shutdown > all MONs and only restart the services all are in the same version? Yes, you can restart them independently. Ceph is designed for zero-downtime upgrades. > 2.2) I am guessing that it is safe to keep OSDS in server B running > (under 9.2.0) while we upgrade OSDS in server B to a newer version. Can you > please confirm? Yes. > 2.3) Finally, can I upgrade / restart each MDS independently? If yes, is > there a particular order (like first the standby-replay one and then the > main one)? Or should I shutdown all MDS services (making sure that no > clients are connected) and only restart the services when all are in the > same version? Especially since you should only have one active MDS, restarting them individually shouldn't be an issue. I guess I'd recommend that you restart the active one last though, just to prevent having to replay more often than necessary. ;) -Greg _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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