I was asked to send this to the list. At some point it will be properly documented, but for the moment... The mds heartbeat controls are mds_beacon_interval and mds_beacon_grace. (So named because the beacon is used for a little bit more than heartbeating; but it also serves heartbeat purposes and its other duties aren't harmed by changing these settings.) A heartbeat is sent every mds_beacon_interval_seconds, and the monitor will mark an MDS laggy if the monitor doesn't receive a beacon for mds_beacon_grace seconds. If you change mds_beacon_grace you should also change mds_session_timeout and mds_reconnect_timeout to match, so that mds_reconnect_timeout = (mds_session_timeout - mds_beacon_grace). These tunables specify how long a recovering MDS waits before it declares clients as having failed, which is why it needs to be adjusted as well. -Greg -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
