Ceph » CephFS

Description of problem:
MDS rank-info for standby replay MDS daemon is not matching between CLI and JSON output.

For a Standby Replay MDS deaemon attached to Active MDS with rank-0, rank info under Standby-Replay MDS shows as '0-s' in CLI and as '1' in JSON output, please refer below output for details.

CLI output:
-----------

[root@ceph-sumar-tfa-fix-h3305o-node7 ~]# ceph fs status
cephfs - 0 clients ======
RANK STATE MDS ACTIVITY DNS INOS DIRS CAPS
0 active cephfs.ceph-sumar-tfa-fix-h3305o-node4.mpgdkm Reqs: 0 /s 10 13 12 0
1 active cephfs.ceph-sumar-tfa-fix-h3305o-node5.mjoicz Reqs: 0 /s 10 13 11 0
0-s standby-replay cephfs.ceph-sumar-tfa-fix-h3305o-node2.hhizjz Evts: 0 /s 0 3 2 0
1-s standby-replay cephfs.ceph-sumar-tfa-fix-h3305o-node6.oqyvda Evts: 0 /s 0 0 0 0
POOL TYPE USED AVAIL
cephfs.cephfs.meta metadata 168k 54.9G
cephfs.cephfs.data data 0 54.9G
STANDBY MDS
cephfs.ceph-sumar-tfa-fix-h3305o-node3.cllcsk
MDS version: ceph version 19.1.0-42.el9cp (03ae7f7ffec5e7796d2808064c4766b35c4b5ffb) squid (rc)

JSON output:
------------
[root@ceph-sumar-tfa-fix-h3305o-node7 ~]# ceph fs status --f json

{"clients": [{"clients": 0, "fs": "cephfs"}], "mds_version": [{"daemon": ["cephfs.ceph-sumar-tfa-fix-h3305o-node4.mpgdkm", "cephfs.ceph-sumar-tfa-fix-h3305o-node5.mjoicz", "cephfs.ceph-sumar-tfa-fix-h3305o-node2.hhizjz", "cephfs.ceph-sumar-tfa-fix-h3305o-node6.oqyvda", "cephfs.ceph-sumar-tfa-fix-h3305o-node3.cllcsk"], "version": "ceph version 19.1.0-42.el9cp (03ae7f7ffec5e7796d2808064c4766b35c4b5ffb) squid (rc)"}], "mdsmap": [{"caps": 0, "dirs": 12, "dns": 10, "inos": 13, "name": "cephfs.ceph-sumar-tfa-fix-h3305o-node4.mpgdkm", "rank": 0, "rate": 0, "state": "active"}, {"caps": 0, "dirs": 11, "dns": 10, "inos": 13, "name": "cephfs.ceph-sumar-tfa-fix-h3305o-node5.mjoicz", "rank": 1, "rate": 0, "state": "active"}, {"caps": 5, "dirs": 5, "dns": 5, "events": 0, "inos": 5, "name": "cephfs.ceph-sumar-tfa-fix-h3305o-node2.hhizjz", "rank": 1, "state": "standby-replay"}, {"caps": 5, "dirs": 5, "dns": 5, "events": 0, "inos": 5, "name": "cephfs.ceph-sumar-tfa-fix-h3305o-node6.oqyvda", "rank": 1, "state": "standby-replay"}, {"name": "cephfs.ceph-sumar-tfa-fix-h3305o-node3.cllcsk", "state": "standby"}], "pools": [{"avail": 58956873728, "id": 4, "name": "cephfs.cephfs.meta", "type": "metadata", "used": 172032}, {"avail": 58956873728, "id": 5, "name": "cephfs.cephfs.data", "type": "data", "used": 0}]}

Version-Release number of selected component (if applicable):19.1.0-42.el9cp

How reproducible: 5/5

Steps to Reproduce:
1. Configure Standby Replay MDS daemon
2. Run ceph fs status and ceph fs status --f json
3. Compare CLI and JSON output response for rank fields of Standby Replay MDS Daemon

Actual results: JSON Response shows rank as 1 for Standby Replay MDS attached to active MDS with rank 0.

Expected results: JSON response should match CLI output. In CLI, rank info for Standby Replay MDS is seen as '0-s', this information is helpful, as it helps us know that it is attached to active MDS with rank0, Likewise, for standby replay MDS with rank info as '1-s'.

Similar inputs should be available in JSON output too for standby replay MDS info.

Please look into https://bugzilla.redhat.com/show_bug.cgi?id=2307231 for more info