Hi All, I'm looking for a bit of advice on the subject of this post. I've been "staring at the trees so long I can't see the forest any more". :-) Rocky Linux Client latest version. Ceph Reef latest version. I have read *all* the doco on the Ceph website. I have created a pool (my_pool) and an image (my_image). I had activated the pool for RBD. I can run the `rbdmap map` command on the client and the image shows up as /dev/rbd0 (and also /dev/rbd/my_pool/my_image). But here's where I'm running into issues - and I'm pretty sure it's a 'Level 8' issue, so it'll be something simple that I'm just not "getting": Do I need to run `mkfs` on /dev/rbd0 before I try `mount /dev/rbd/my_pool/my_image /mnt/rbd_image`? The reason I ask is that I've tried to mount the image before I run 'mkfs' and I get back `mount: /mnt/rbd_image: wrong fs type, bad option, bad superblock on /dev/rbdo, missing codepage or helper program, or other error`. I've also tried to mount the image after I run 'mkfs' and I get back `mount: /mnt/rbd_image: can't read superblock on /dev/rbd0`. Basically, as I've said, I'm missing or don't understand *something* about this process - which is why I'm now seeking the collective wisdom of the Community. All help and advice greatly appreciated - thanks in advance Cheers Dulux-Oz