Hi again, it is not the first time, just after i posted my question i find a solution :-) What i needed to do was stopping the osd first: systemctl stop ceph-osd@0 Then unmounting the tempfs: umount /var/lib/ceph/osd/ceph-0 So now the script is able to remove the folder, and adopt the osd: ```````````````````` ~# cephadm adopt --style legacy --name osd.0 INFO:cephadm:Pulling latest docker.io/ceph/ceph:v15 container... INFO:cephadm:objectstore_type is bluestore INFO:cephadm:Disabling old systemd unit ceph-osd@0... INFO:cephadm:Moving data... INFO:cephadm:Chowning content... INFO:cephadm:Chowning /var/lib/ceph/6d0ecf22-9155-4684-971a-2f6cde8628c8/osd.0/block... INFO:cephadm:Disabling host unit ceph-volume@ lvm unit... INFO:cephadm:Moving logs... INFO:cephadm:Creating new units... ```````````````````` Yours, bbk