On Tue, Jun 11, 2013 at 3:50 PM, Gregory Farnum <greg@xxxxxxxxxxx> wrote: > You should not run more than one active MDS (less stable than a > single-MDS configuration, bla bla bla), but you can run multiple > daemons and let the extras serve as a backup in case of failure. The > process for moving an MDS is pretty easy: turn on a daemon somewhere > else, confirm it's connected to the cluster, then turn off the old > one. > Doing it that way will induce ~30 seconds of MDS inavailability while > it times out, but on cuttlefish you should be able to force an instant > takeover if the new daemon uses the same name as the old one (I > haven't worked with this much myself so I might be missing a detail; > if this is important you should check). > > (These relatively simple takeovers are thanks to the MDS only storing > data in RADOS, and are one of the big design considerations in the > system architecture). Thanks Greg! That sounds pretty easy. Although it has me wondering what config option differentiates between an active MDS and a backup MDS daemon? Bryan _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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