Hello, I haven't needed to replace a disk in awhile and it seems that I have misplaced my quick little guide on how to do it. When searching the docs it is now recommending that you should use ceph-volume to create OSDs when doing that it creates LV: Disk /dev/sde: 4000.2 GB, 4000225165312 bytes, 7812939776 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/mapper/ceph--34b5a0a9--f84a--416f--8b74--fb1e05161f80-osd--block--4581caf4--eef0--42e1--b237--c114dfde3d15: 4000.2 GB, 4000220971008 bytes, 7812931584 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Cool but all of my other OSDs look like this and appear to just be XFS. Disk /dev/sdd: 4000.2 GB, 4000225165312 bytes, 7812939776 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: gpt Disk identifier: D0195044-10B5-4113-8210-A5CFCB9213A2 # Start End Size Type Name 1 2048 206847 100M Ceph OSD ceph data 2 206848 7812939742 3.7T unknown ceph block 35075 ? S< 0:00 [xfs-buf/sdd1] 35076 ? S< 0:00 [xfs-data/sdd1] 35077 ? S< 0:00 [xfs-conv/sdd1] 35078 ? S< 0:00 [xfs-cil/sdd1] 35079 ? S< 0:00 [xfs-reclaim/sdd] 35080 ? S< 0:00 [xfs-log/sdd1] 35082 ? S 0:00 [xfsaild/sdd1] I can't seem to find the instructions in order to create an OSD like the original ones anymore. I'm pretty sure that when this cluster was setup it was setup using the: ceph-deploy osd prepare ceph-deploy osd create ceph-deploy osd activate commands, but it seems as though the prepare and activate commands have since been removed from ceph-deploy, so I am really confused. =) Does anyone by chance have the instructions for replacing a failed drive when it meets the above criteria?