An 'expected-osd-count' of 0 does not work

[Peter Matulis]

When I deploy 1 ceph-osd unit the ceph-mon application still expects 3. Since I haven't specified a value for (the ceph-mon) option 'expected-osd-count' my understanding is that the default value of '0' will make ceph-mon consider the actual number of OSDs in the cluster, which in my case is 1. When I redo the deployment with 'expected-osd-count=1' it works. That's why I'm saying that an expected-osd-count of 0 does not work the way it's supposed to.

[Chris MacNaughton (chris.macnaughton)]

Broadly speaking, an OSD count of 1 is invalid, as ceph is designed to have redundancy.

[Peter Matulis (petermatulis)]

The ceph-mon and ceph-osd charm READMEs will document this better.