CephFS: cached inodes with active-standby

[David <dclistslinux@xxxxxxxxx>]

Hi All

When I compare a  'ceph daemon mds.id perf dump mds' on my active MDS with my standby-replay MDS, the inodes count on the standby is a lot less than the active. I would expect to see a very similar number of inodes or have I misunderstood this feature? My understanding was the replay daemon will maintain the same cache as the active.

If I stop the mds daemon on the active, the standby-replay rejoins quickly, I'm just curious about the discrepancy in the inode count.

This is Jewel 10.2.2

On the active server I see:

 "inode_max": 200000,

        "inodes": 200015,

On the standby-replay:

 "inode_max": 200000,

        "inodes": 98000,

mds section from my ceph.conf (hostnames changed):

[mds]

  mds data = "">

  keyring = /var/lib/ceph/mds/mds.$host/mds.$host.keyring

  mds standby replay = true

[mds.active]

  host = active

  standby for rank = 0

  mds_cache_size = 200000

[mds.standbyreplay]

  host = standbyreplay

  standby for rank = 0

  mds_cache_size = 200000

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