# Major Themes

v1.5...

## K8s Version Support

## Upgrade Guides

## Breaking Changes

### Ceph

- Ceph mons require an odd number for a healthy quorum. An even number of mons is now disallowed.
- Update deprecated CRD apiextensions.k8s.io/v1beta1 to v1 ([#6424](https://github.com/rook/rook/pull/6424))
- preservePoolsOnDelete is deprecated for CephFilesystem and is no longer allowed because of data-loss concerns. preserveFilesystemOnDelete acts as a replacement and preserves the filesystem when the CephFilesystem CRD is deleted (which implicitly includes all associated pools). See [#6495](https://github.com/rook/rook/pull/6495) for more details.

## Features

### Ceph

* Ceph Block Pool: add mirroring support
* Ceph Block Pool: add `replicasPerFailureDomain` to set the number of replica in a failure domain ([#5591](https://github.com/rook/rook/issues/5591))
* Ceph Cluster: export the storage capacity of the ceph cluster ([#6475](https://github.com/rook/rook/pull/6475))
* Ceph Cluster: add encryption support with Key Management Service