We did not have any cephfs or mds involved. But since you haven’t even started a ceph upgrade in earnest, I have to wonder about your nautilus versions. Maybe you have a mismatch there?
I would definitely share the output of `ceph versions` and `ceph features`. If you’re not 14.2.22 across the board, I would at least upgrade your mon, mgr, and mds services. Then check release notes to see if there’s any clues there.
From: Götz Reinicke <goetz.reinicke@filmakademie.de>
Date: Friday, August 4, 2023 at 9:02 AM
To: ceph-users@ceph.io <ceph-users@ceph.io>
Subject: [EXTERNAL] [ceph-users] cephfs mount problem - client session lacks required features
Hi,
During the upgrade from centos7/nautilus to ubuntu 18/nautilus (still updating the MONs) I got a cephfs client who refuses or is refused to mount the ceph fs again.
The clients says: mount error 13 = Permission denied
The cephmds log: lacks required features 0x0000000000001000 client supports 0x00000000000000ff
The mds/mon is still centos7/nautilus. The Clients centos7 as well.
Any ideas ? Thx for suggestions and hints . Best Götz