We use the following in our ceph.conf for MDS failover. We're running one active and one standby. Last time it failed over there was about 2 minutes of downtime before the mounts started responding again but it did recover gracefully.
[mds]
max_mds = 1
mds_standby_for_rank = 0
mds_standby_replay = true
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John Petrini
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