Ceph

See this ceph-users mailing list thread: https://www.spinics.net/lists/ceph-users/msg74238.html

Currently it is not possible to disable "stretch mode". Hereby I request to consider making an exit strategy for "stretch mode" a possibility. Use cases that might benefit from this:

- stretch cluster that is permanently degraded because of the permanent loss of a data center (or the specific bucket used)
- convert (expand) a "stretch mode" cluster to a traditional setup like a 3 data center setup