On Tue, Feb 12, 2013 at 7:02 AM, Wolfgang Hennerbichler <wolfgang.hennerbichler@xxxxxxxxxxxxxxxx> wrote: > > > On 02/12/2013 01:54 PM, SZÉKELYI Szabolcs wrote: > >> I'm not a Ceph expert, but I don't think so. Quorum is an essential feature of >> clusters to prevent split-brain situations. Even if it was possible, you >> really should not do that otherwise you may end up losing data in case a real >> split-brain occurs. > > So I have a ceph cluster of 4 nodes on separate sites (two nodes each > site, 1 mon on site A, 2 mons on site B). crush-maps make sure that data > stays site-local. If the sites are split (brained) through the WAN line, > that means my monitors are divided by half, and site A would stop > working? This should _not_ happen. A Split-Brain in this case wouldn't > hurt, because as I said, all the data is staying site-local. That's an interesting layout! Unfortunately, the monitors ensure consistency cluster-wide, and don't take into account the layout that you've specified or that it happens to allow partitioning between the sites. There's a previous discussion on this topic that might be useful to you: http://www.mail-archive.com/ceph-devel@xxxxxxxxxxxxxxx/msg06329.html -sam > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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