[ovirt-users] self hosted storage engine disaster recovery procedure

Hello, I am getting familiar with oVirt and using the self-hosted engine on an iSCSI SAN and so far everything seems quite impressive. I am trying to document a disaster recovery mecanism using a full OS backup as well as a engine backup as described at http://www.ovirt.org/Ovirt-engine-backup I am unclear however how to prepare the existing iSCSI LUN to receive the data restore. I am able to destroy the engine and the VMs continue to run, however I am unclear how I can free the host lock on that LUN, format it and re-install on it. Is there a howto/document I can refer to in order to do this? I am looking for info as to how I can re-install a functional engine from a backup in the case of data-corruption or any other disaster that could happen on the iSCSI LUN set aside for the engine, and a means to re-install on that LUN should the need be, without having to power down the VMs or worse, power everything down and re-install everything from scratch. How can I boot a CentOS install disk and have the previous's engine LUN as a install target, and then boot that installed OS to restore the engine backup data? Thanks in advance, Ron