Hi.
We have a 5 node Ceph cluster, status output copied below. During our cluster
resiliency tests we have noted that a MON leader election takes place when we
fail one member of the MON quorum, even though the failed instance is not the
current MON leader. We speculate that this re-election process may be
contributing to short periods of cluster unavailability when one or more
cluster instances fail. Is there a way to configure the cluster so that there
is only a MON leader election if the existing MON leader fails but not when
some other member of the MON quorum fails?
cluster:
id: f774b9b2-d514-40d9-85ab-d0389724b6c0
health: HEALTH_OK
services:
mon: 3 daemons, quorum dub-sitv-ceph-03,dub-sitv-ceph-04,dub-sitv-ceph-05
mgr: dub-sitv-ceph-04(active), standbys: dub-sitv-ceph-03, dub-sitv-ceph-05
mds: cephfs-1/1/1 up {0=dub-sitv-ceph-02=up:active}, 1 up:standby-replay
osd: 4 osds: 4 up, 4 in
data:
pools: 2 pools, 200 pgs
objects: 554 objects, 980 MiB
usage: 7.9 GiB used, 1.9 TiB / 2.0 TiB avail
pgs: 200 active+clean
io:
client: 1.5 MiB/s rd, 810 KiB/s wr, 286 op/s rd, 218 op/s wr
William Lawton
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