Comment 9 for bug 1424060

Also trying the node deletion in a lab cluster (fuel v6.0.0), I noticed the following issues:

When a node is deleted it is not removed from the crush and osd maps, so the removed nodes will stay forever in osd tree in down state.

For the 3 OSD cluster with replication factor 2 I was able to remove down to 1 node without any warning from fuel, i.e. resulting in the cluster in degraded state. When I tried to remove the lats node, there was no warning when I was adding removal to pending (it was only about "Compute nodes are recommended for deployment"), still there was the error when I actually tried to deploy changes: "Number of OSD nodes (1) cannot be less than the Ceph object replication factor (2). Please either assign ceph-osd role to more nodes, or reduce Ceph replication factor in the Settings tab." So the fuel did not allow me to lost data (good), but It looks like the error was supposed to be triggered earlier, when I was reducing the cluster from 2 OSD to 1?