Re: [ceph-users] Shutting down a cluster fully and powering it back up
On 2015-02-28 20:46:15 +, Gregory Farnum said: Sounds good! -Greg On Sat, Feb 28, 2015 at 10:55 AM David da...@visions.se wrote: Hi! We did that a few weeks ago and it mostly worked fine. However, on startup of one of the 4 machines, it got stuck while starting OSDs (at least that's what the console output indicated), while the others started up just fine. After waiting for more than 20 minutes with the other 3 machines already back up we hit ctrl-alt-del via the server console. The signal got caught, the OS restarted and came up without problems the next time. Unfortunately, as this was in the middle of the night after a very long day of moving hardware around in the datacenter we did not manage to save the logs before they were rotated... Daniel ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
Re: [ceph-users] Shutting down a cluster fully and powering it back up
Sounds good! -Greg On Sat, Feb 28, 2015 at 10:55 AM David da...@visions.se wrote: Hi! I’m about to do maintenance on a Ceph Cluster, where we need to shut it all down fully. We’re currently only using it for rados block devices to KVM Hypervizors. Are these steps sane? Shutting it down 1. Shut down all IO to the cluster. Means turning off all clients (KVM Hypervizors in our case). 2. Set cluster to noout by running: ceph osd set noout 3. Shut down the MON nodes. 4. Shut down the OSD nodes. Starting it up 1. Start the OSD nodes. 2. Start the MON nodes. 3. Check ceph -w to see the status of ceph and take actions if something is wrong. 4. Start up the clients (KVM Hypervizors) 5. Run ceph osd unset noout Kind Regards, David ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
