[PVE-User] CEPH: How to remove an OSD without experiencing inactive placement groups

[Dietmar Maurer]

> I understand this is an emerging technology with active development;
> just want to check I'm not missing anything obvious or haven't
> fundamentally misunderstood how it works. I didn't expect the loss of
> 1/9 of the devices in the pool to cease IO, especially when every object
> exists three times.

This looks like a crush related problem to me. crush maps sometime have problems
with
small setups (also see crush tunables). But I suggest to ask that on the ceph
list.