Hello, in our cluster we have one node with SSD, which are used, but we cannot see it in "ceph orch device ls". Everything als looks OK. For better understanding, the diskname is /dev/sda, it's osd.138: ~# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 1 7T 0 disk ~# wipefs /dev/sda DEVICE OFFSET TYPE UUID LABEL sda 0x0 ceph_bluestore ~# ceph osd tree -9 15.42809 host ceph06 138 ssd 6.98630 osd.138 up 1.00000 1.00000 The file ceph-osd.138.log does not look unusal to me. ceph-volume.log show that the SSD is found by the "lsblk" command of the volume processing. It is not possible to add the SSD by "# ceph orch daemon add osd ceph06:/dev/sda Error message in this case is a question asking if it is already used, even if the SSD is fully wiped via "wipefs -a" or by overwriting the entire disk with the dd command. But It is possible to add it to the cluster by using the option "--method raw". Do you have an idea what happened here and how can I debug this behaviour?