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)