Ceph cannot delete the cephfs

[yyyy]

hi all, here is the output of me following the guide for deleting cephfs, for some reason it errors out and the cephfs still shows in the gui:
root@pve:~# umount -l -f /mnt/pve/
umount: /mnt/pve/: not mounted.
root@pve:~# ls /mnt
cassandra_data pve
root@pve:~# ls /mnt/pve/
cephfs1
root@pve:~# ls /mnt/pve/cephfs1/
root@pve:~# pveceph fs destroy cephfs1 --remove-pools 1 --remove-storage 1
error with 'fs rm': mon_cmd failed - all MDS daemons must be inactive/failed before removing filesystem. See `ceph fs fail`.
root@pve:~# ceph fs fail
Invalid command: missing required parameter fs_name(<string>)
fs fail <fs_name> : bring the file system down and all of its ranks
Error EINVAL: invalid command
root@dws-zve-5:~# ceph fs fail cephfs1
cephfs1 marked not joinable; MDS cannot join the cluster. All MDS ranks marked failed.


Someone suggested this guide on another thread but the instruction do not work as per the above output:

https://pve.proxmox.com/pve-docs/chapter-pveceph.html#_destroy_cephfs

 

[UdoB]

I am not a "real" Ceph user with a lot of experience. Nevertheless I was in your situation yesterday: yes, some documented steps seem to deny to work without sidesteps.

Then I was successful after stopping (or was it deleting? Don't remember) all MDS as your quote suggests also. After running ceph fs rm mycephfilesystemname --yes-i-really-mean-it the filesystems were gone. As this is my test-cluster (!!!) I was sure I really meant it ;-)

Good luck