Use this procedure to diagnose and fix clients not logging into Ceph FS.
NOTE This section does not diagnose nor fix network issues. Please ensure that all networking is functional before proceeding.
IMPORTANT: The following commands can be run from ncn-m001/2/3 or ncn-s001/2/3.
Identify if clients are not logged into Ceph FS.
ceph fs status
Example output:
cephfs - 0 clients <---- This indicates we have no clients connected
======
RANK STATE MDS ACTIVITY DNS INOS
0 active cephfs.ncn-s001.abiiiw Reqs: 0 /s 0 0
0-s standby-replay cephfs.ncn-s002.kyayma Evts: 38 /s 35.5k 3220
POOL TYPE USED AVAIL
cephfs_metadata metadata 2403M 11.1T
cephfs_data data 2641G 11.1T
STANDBY MDS
cephfs.ncn-s003.sjatdm
Fail over the MDS to trigger clients logins.
ceph mds fail 0
NOTE “0” refers to the active rank in our above output.
Verify clients have reconnected.
ceph fs status
Example output:
cephfs - 24 clients <---- Shows our clients have reconnected
======
RANK STATE MDS ACTIVITY DNS INOS
0 active cephfs.ncn-s002.kyayma Reqs: 1 /s 52.8k 20.3k
0-s standby-replay cephfs.ncn-s003.sjatdm Evts: 0 /s 0 0
POOL TYPE USED AVAIL
cephfs_metadata metadata 2404M 11.1T
cephfs_data data 2641G 11.1T
STANDBY MDS
cephfs.ncn-s001.abiiiw
MDS version: ceph version 15.2.8 (bdf3eebcd22d7d0b3dd4d5501bee5bac354d5b55) octopus (stable)