I'm testing out the managed storage to connect to ceph and I have a few questions:
* Would I be correct in assuming that the hosted engine VM needs connectivity to the storage and not just the underlying hosts themselves? It seems like the cinderlib client runs from the engine?
Yes, this is correct
* Does the ceph config and keyring need to replicated onto each hypervisor/host?
No, see[1], the keyring and ceph config can be present only on the engine machine
* I have managed to do one block operation so far (i've created a volume which is visible on the ceph side), but multiple other operations have failed and are 'running' in the engine task list. Is there any way I can increase debugging to see whats happening?
Can you provide logs? mainly engine.log and cinderlib.log (/var/log/ovirt-engine/cinderlib/cinderlib.log