Hi, i am adding new OSDs from a new host with something like: <PROD> [root@server1 ~]# ceph-volume lvm create --data /dev/mapper/mpatha Running command: /usr/bin/ceph-authtool --gen-print-key Running command: /usr/bin/ceph --cluster ceph --name client.bootstrap-osd --keyring /var/lib/ceph/bootstrap-osd/ceph.keyring -i - osd new dbb58525-c4f6-4a1e-b03a-ac5966f09809 Running command: vgcreate --force --yes ceph-11881314-f5e5-480f-9ac4-d25739e0dd74 /dev/mapper/mpatha stdout: Physical volume "/dev/mapper/mpatha" successfully created. stdout: Volume group "ceph-11881314-f5e5-480f-9ac4-d25739e0dd74" successfully created Running command: lvcreate --yes -l 3814911 -n osd-block-dbb58525-c4f6-4a1e-b03a-ac5966f09809 ceph-11881314-f5e5-480f-9ac4-d25739e0dd74 stdout: Logical volume "osd-block-dbb58525-c4f6-4a1e-b03a-ac5966f09809" created. Running command: /usr/bin/ceph-authtool --gen-print-key Running command: /usr/bin/mount -t tmpfs tmpfs /var/lib/ceph/osd/ceph-233 Running command: /usr/sbin/restorecon /var/lib/ceph/osd/ceph-233 Running command: /usr/bin/chown -h ceph:ceph /dev/ceph-11881314-f5e5-480f-9ac4-d25739e0dd74/osd-block-dbb58525-c4f6-4a1e-b03a-ac5966f09809 Running command: /usr/bin/chown -R ceph:ceph /dev/dm-30 Running command: /usr/bin/ln -s /dev/ceph-11881314-f5e5-480f-9ac4-d25739e0dd74/osd-block-dbb58525-c4f6-4a1e-b03a-ac5966f09809 /var/lib/ceph/osd/ceph-233/block Running command: /usr/bin/ceph --cluster ceph --name client.bootstrap-osd --keyring /var/lib/ceph/bootstrap-osd/ceph.keyring mon getmap -o /var/lib/ceph/osd/ceph-233/activate.monmap stderr: 2026-01-27T20:22:26.212+0100 7f9a406c6640 -1 auth: unable to find a keyring on /etc/ceph/ceph.client.bootstrap-osd.keyring,/etc/ceph/ceph.keyring,/etc/ceph/keyring,/etc/ceph/keyring.bin: (2) No such file or directory 2026-01-27T20:22:26.212+0100 7f9a406c6640 -1 AuthRegistry(0x7f9a380648f8) no keyring found at /etc/ceph/ceph.client.bootstrap-osd.keyring,/etc/ceph/ceph.keyring,/etc/ceph/keyring,/etc/ceph/keyring.bin, disabling cephx stderr: got monmap epoch 6 --> Creating keyring file for osd.233 Running command: /usr/bin/chown -R ceph:ceph /var/lib/ceph/osd/ceph-233/keyring Running command: /usr/bin/chown -R ceph:ceph /var/lib/ceph/osd/ceph-233/ Running command: /usr/bin/ceph-osd --cluster ceph --osd-objectstore bluestore --mkfs -i 233 --monmap /var/lib/ceph/osd/ceph-233/activate.monmap --keyfile - --osd-data /var/lib/ceph/osd/ceph-233/ --osd-uuid dbb58525-c4f6-4a1e-b03a-ac5966f09809 --setuser ceph --setgroup ceph stderr: 2026-01-27T20:22:26.421+0100 7fe148736780 -1 bluestore(/var/lib/ceph/osd/ceph-233//block) _read_bdev_label unable to decode label at offset 102: void bluestore_bdev_label_t::decode(ceph::buffer::v15_2_0::list::const_iterator&) decode past end of struct encoding: Malformed input [buffer:3] stderr: 2026-01-27T20:22:26.421+0100 7fe148736780 -1 bluestore(/var/lib/ceph/osd/ceph-233//block) _read_bdev_label unable to decode label at offset 102: void bluestore_bdev_label_t::decode(ceph::buffer::v15_2_0::list::const_iterator&) decode past end of struct encoding: Malformed input [buffer:3] stderr: 2026-01-27T20:22:26.421+0100 7fe148736780 -1 bluestore(/var/lib/ceph/osd/ceph-233//block) _read_bdev_label unable to decode label at offset 102: void bluestore_bdev_label_t::decode(ceph::buffer::v15_2_0::list::const_iterator&) decode past end of struct encoding: Malformed input [buffer:3] stderr: 2026-01-27T20:22:26.421+0100 7fe148736780 -1 bluestore(/var/lib/ceph/osd/ceph-233/) _read_fsid unparsable uuid --> ceph-volume lvm prepare successful for: /dev/mapper/mpatha Running command: /usr/bin/chown -R ceph:ceph /var/lib/ceph/osd/ceph-233 Running command: /usr/bin/ceph-bluestore-tool --cluster=ceph prime-osd-dir --dev /dev/ceph-11881314-f5e5-480f-9ac4-d25739e0dd74/osd-block-dbb58525-c4f6-4a1e-b03a-ac5966f09809 --path /var/lib/ceph/osd/ceph-233 --no-mon-config Running command: /usr/bin/ln -snf /dev/ceph-11881314-f5e5-480f-9ac4-d25739e0dd74/osd-block-dbb58525-c4f6-4a1e-b03a-ac5966f09809 /var/lib/ceph/osd/ceph-233/block Running command: /usr/bin/chown -h ceph:ceph /var/lib/ceph/osd/ceph-233/block Running command: /usr/bin/chown -R ceph:ceph /dev/dm-30 Running command: /usr/bin/chown -R ceph:ceph /var/lib/ceph/osd/ceph-233 Running command: /usr/bin/systemctl enable ceph-volume@lvm-233-dbb58525-c4f6-4a1e-b03a-ac5966f09809 stderr: Created symlink /etc/systemd/system/multi-user.target.wants/ceph-volume@lvm-233-dbb58525-c4f6-4a1e-b03a-ac5966f09809.service → /usr/lib/systemd/system/ceph-volume@.service. Running command: /usr/bin/systemctl enable --runtime ceph-osd@233 stderr: Created symlink /run/systemd/system/ceph-osd.target.wants/ceph-osd@233.service → /usr/lib/systemd/system/ceph-osd@.service. Running command: /usr/bin/systemctl start ceph-osd@233 --> ceph-volume lvm activate successful for osd ID: 233 --> ceph-volume lvm create successful for: /dev/mapper/mpatha --- I get few errors in output like: stderr: 2026-01-27T20:22:26.212+0100 7f9a406c6640 -1 auth: unable to find a keyring on /etc/ceph/ceph.client.bootstrap-osd.keyring,/etc/ceph/ceph.keyring,/etc/ceph/keyring,/etc/ceph/keyring.bin: (2) No such file or directory 2026-01-27T20:22:26.212+0100 7f9a406c6640 -1 AuthRegistry(0x7f9a380648f8) no keyring found at /etc/ceph/ceph.client.bootstrap-osd.keyring,/etc/ceph/ceph.keyring,/etc/ceph/keyring,/etc/ceph/keyring.bin, disabling cephx ... and then ... bluestore_bdev_label_t::decode(ceph::buffer::v15_2_0::list::const_iterator&) decode past end of struct encoding: Malformed input [buffer:3] stderr: 2026-01-27T20:22:26.421+0100 7fe148736780 -1 bluestore(/var/lib/ceph/osd/ceph-233//block) _read_bdev_label unable to decode label at offset 102: void bluestore_bdev_label_t::decode(ceph::buffer::v15_2_0::list::const_iterator&) decode past end of struct encoding: Malformed input [buffer:3] stderr: 2026-01-27T20:22:26.421+0100 7fe148736780 -1 bluestore(/var/lib/ceph/osd/ceph-233//block) _read_bdev_label unable to decode label at offset 102: void bluestore_bdev_label_t::decode(ceph::buffer::v15_2_0::list::const_iterator&) decode past end of struct encoding: Malformed input [buffer:3] stderr: 2026-01-27T20:22:26.421+0100 7fe148736780 -1 bluestore(/var/lib/ceph/osd/ceph-233/) _read_fsid unparsable uuid ... but cluster seems to add and work on new OSDs anyway. Anyone had a similar issue? Or can I ignore this error? Kind regards, Rok