Hi, After being forced to reinstall the O/S on all my Ceph nodes, I'm trying to reactivate the OSDs, whose data lie on separate drives. The OSDs are recognised: mixtile@blade3n3:~$ sudo sudo ceph-volume lvm list [sudo] password for mixtile: ====== osd.1 ======= [block] /dev/ceph-5b8338a0-9246-48f5-9cfd-e1bbfa1cc199/osd-block-ccba3dd 2-0503-440f-b7c2-47e8d8e85253 block device /dev/ceph-5b8338a0-9246-48f5-9cfd-e1bbfa1cc199/o sd-block-ccba3dd2-0503-440f-b7c2-47e8d8e85253 block uuid 21ftde-FdBB-s4DM-Qeq7-TU4R-vjY7-6VXLoW cephx lockbox secret cluster fsid 8aad3073-39a1-11f1-bf6e-f2704a1efa9b cluster name ceph crush device class encrypted 0 osd fsid ccba3dd2-0503-440f-b7c2-47e8d8e85253 osd id 1 osdspec affinity all-available-devices type block vdo 0 with tpm 0 devices /dev/nvme0n1 *But: *When trying to link the OSD to the all-new Ceph installation (I've made several Google searches with contradictory results. This is the last one.), I get an error: mixtile@blade3n3:~$ sudo cephadm shell Inferring fsid 98e04296-5b5a-11f1-84cf-ceccf52b4a0f Inferring config /var/lib/ceph/98e04296-5b5a-11f1-84cf-ceccf52b4a0f/mon.blade3n3 /config Not using image 'sha256:af0c5903e901e329adabe219dfc8d0c3efc1f05102a753902f33ee16 c26b6cee' as it's not in list of non-dangling images with ceph=True label Unable to find image 'quay.io/ceph/ceph:v19' locally v19: Pulling from ceph/ceph Digest: sha256:af0c5903e901e329adabe219dfc8d0c3efc1f05102a753902f33ee16c26b6cee Status: Downloaded newer image for quay.io/ceph/ceph:v19 root@blade3n3:/usr/bin# cd root@blade3n3:~# ceph-volume lvm activate --all Running command: /usr/bin/ceph-authtool --gen-print-key Running command: /usr/bin/ceph-authtool --gen-print-key --> Activating OSD ID 1 FSID ccba3dd2-0503-440f-b7c2-47e8d8e85253 Running command: /usr/bin/mount -t tmpfs tmpfs /var/lib/ceph/osd/ceph-1 Running command: /usr/bin/chown -R ceph:ceph /var/lib/ceph/osd/ceph-1 Running command: /usr/bin/ceph-bluestore-tool --cluster=ceph prime-osd-dir --dev /dev/ceph-5b8338a0-9246-48f5-9cfd-e1bbfa1cc199/osd-block-ccba3dd2-0503-440f-b7c2-47e8d8e85253 --path /var/lib/ceph/osd/ceph-1 --no-mon-config stderr: 2026-05-29T17:28:36.854+0000 ffffbd2de040 -1 bdev(0xaaab21623800 /dev/c eph-5b8338a0-9246-48f5-9cfd-e1bbfa1cc199/osd-block-ccba3dd2-0503-440f-b7c2-47e8d 8e85253) open stat got: (1) Operation not permitted stderr: failed to read label for /dev/ceph-5b8338a0-9246-48f5-9cfd-1bbfa1cc199 /osd-block-ccba3dd2-0503-440f-b7c2-47e8d8e85253: (1) Operation not permitted --> RuntimeError: command returned non-zero exit status: 1 This puzzles me because I'm already root, but the Bluestore tool won't let me reactivate the OSD? The old OSD is now full of valuable production data. And: Isn't it possible to use ceph orch to perform this operation? Regards Jacek Rużyczka