Cloned from launchpad blueprint https://blueprints.launchpad.net/nova/+spec/lvm-clear-option.
To increase the performance of any instances I've tested in combination with libvirt and kvm some cases. KVM + Block devices seems to be the fastest but I've found a show stopper. Every time if i delete an instance nova will do a dd on the deleted volume and this takes a long time and consume a lot of power.
I've found in the code (https://github.com/openstack/nova/blob/master/nova/virt/libvirt/utils.py#L350) a comment to make this configurable as by cinder volumes (scure delete). This should be done otherwise is lvm on a compute in a production system in my cases not usable.
Specification URL (additional information):
*** This bug has been marked as a duplicate of bug 1057371 ***