I have a small cluster on Pacific with roughly 600 RBD images. Out of those 600 images I have 2 which are in a somewhat odd state. root@cephmon:~# rbd info Cloud-Ceph1/vm-134-disk-0 rbd image 'vm-134-disk-0': size 1000 GiB in 256000 objects order 22 (4 MiB objects) snapshot_count: 11 id: 7c326b8b4567 block_name_prefix: rbd_data.7c326b8b4567 format: 2 features: layering, exclusive-lock, object-map, fast-diff, deep-flatten, operations op_features: snap-trash flags: create_timestamp: Fri Aug 14 07:11:44 2020 access_timestamp: Thu Jun 8 06:31:06 2023 modify_timestamp: Thu Jun 8 06:31:11 2023 Specifically, the feature "operations". I never set this feature; and I don't see it listed in documentation. This feature is causing my backup software to not be able to backup the rdb. Otherwise, it's working aok. I did attempt to remove the feature. root@cephmon:~# rbd feature disable Cloud-Ceph1/vm-464-disk-0 operations rbd: failed to update image features: 2023-06-08T07:50:21.899-0400 7fdea52ae340 -1 librbd::Operations: cannot update immutable features (22) Invalid argument Any help or input is great appreciated. This message and any attachments may contain information that is protected by law as privileged and confidential, and is transmitted for the sole use of the intended recipient(s). If you are not the intended recipient, you are hereby notified that any use, dissemination, copying or retention of this e-mail or the information contained herein is strictly prohibited. If you received this e-mail in error, please immediately notify the sender by e-mail, and permanently delete this e-mail.