On Thu, Feb 21, 2013 at 1:31 PM, Gregory Farnum <greg@xxxxxxxxxxx> wrote: > On Thu, Feb 21, 2013 at 1:22 PM, Martin B Nielsen <martin@xxxxxxxxxxx> wrote: >> Hi, >> >> Just curious here - if a setup would have only 1 monitor - and that >> monitor dies; what would happen? >> >> If say the cluster is only used as rbd with blockdevices running VM - >> would they keep running or would everything just stop? >> >> Also, what options would there be if the disk with the monitor died >> and there was no backup? Can one create a new monitor and just dump >> into the cluster or would that require a complete backup of whatever >> the original monitor had (as in, if the disks of the one monitor dies >> and one has no backup = game over?). Or would a backup not even >> suffice? > > Game over, essentially. You shouldn't run anything but the most > trivial test clusters with a single monitor. I could reconstruct a > usable monitor from data available through the rest of the system if > necessary, and for a sufficient fee to Inktank — someday we will have > tools for this, but they don't exist right now — but it's a lot > cheaper to just run three monitors from the get-go. ;) > -Greg Oh, and to be more specific about the clients and OSDs — they would keep running for probably a couple minutes, but eventually they would do something that required a monitor acknowledgement, or time out their maps and stop doing any work until they could re-establish a connection. _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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