Hi Marc,
I think for an upgrade the rocksdb is necessary. Check this for your monitors
cat /var/lib/ceph/mon/ceph-a/kv_backend
Thanks, but I already had migrated all mons to use rocksdb when upgrading to Luminous.
~ # cat /srv/ceph/mon/ceph-host1/kv_backend
rocksdb
Is this what you expect here?
Best regards
Oliver