If, in the case above, you have a monitor per room (a, b) and one in a third location outside of either (c), you would have the ability to take down the entirety of either room and still maintain monitor quorum. (a,c or b,c) The cluster would continue to work.
On Fri, Apr 5, 2013 at 10:02 AM, Dimitri Maziuk <dmaz...@bmrb.wisc.edu> wrote: > On 4/5/2013 7:57 AM, Wido den Hollander wrote: > >> You always need a majority of your monitors to be up. In this case you >> loose 66% of your monitors, so mon.b can't get a majority. >> >> With 3 monitors you need at least 2 to be up to have your cluster working. > > > That's kinda useless, isn't it? I'd've thought "2 copies on-site and one > off-site, and if the main site room's down we can work off the off-site > server" is a basic enough HA setup -- we've had it here for some time. Now > you tell me ceph won't even do that? > > Dima > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -- ______________________________ Dino Yancey 2GNT.com Admin _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
