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Thank you Greg... There is one further thing which is not explained in the release
notes and that may be worthwhile to say. The rpm structure (for redhat compatible releases) changed in Jewel where now there is a ( ceph + ceph-common + ceph-base + ceph-mon/osd/mds + others ) packages while in infernalis there was only ( ceph + ceph-common + others ) packages I haven't tested things yet myself but the standard upgrade instructions just say to do a 'yum update && yum install ceph' and I actually wonder how this will pull ceph-mon in a MON, ceoh-osd in an OSD server or ceph-mds in a MDS. Unless everything is pulled together in each service (even if not used afterwards). Cheers G.
* INFERNALIS:
On 05/25/2016 07:45 AM, Gregory Farnum
wrote:
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 -- Goncalo Borges Research Computing ARC Centre of Excellence for Particle Physics at the Terascale School of Physics A28 | University of Sydney, NSW 2006 T: +61 2 93511937 |
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