Comment 5 for bug 1027987

Ryan, what you are missing out on is Libvirt being able to create volumes (LVs) in that pool (the VG) on command. I assume you create LVs manually via lvcreate and then tell Libvirt to use them for VMs? If Libvirt manages the pool you can use virt-manager, virsh or any of the APIs/bindings to talk to Libvirt and command the creation of volumes for VMs.

An interesting point you brought up: we have dozens of servers running Ubuntu 12.04 for many weeks now where either this problem was not present (or not as promiment) or I simply have not noticed it consciously before. Unfortunately I can't test and experiment much since most of these servers are in production. On the servers I can experiment the problem is definitely present and noticeable.