Thanks for the information you provided in you last update.
The behavior you describe is the default behavior for libvirt/qemu on
Maverick. Disk probing is disabled by default so libvirt will not
attempt to determine what format the underlying disk is actually in and
defaults to raw (I've had this issue myself). This can be re-enabled
(see allow_disk_format_probing in /etc/libvirt/qemu.conf) but disk
probing is considered a potential security vulnerability so I would not
recommend this course of action.
Its a little unclear from the original bug report as to why you cannot
specify the driver for the disk in the definition for the virtual
machine using the following line:
<driver name='qemu' type='raw'/>
Are you using opennebula to generate the virtual machine definitions?
In which case we may need to re-assign this bug to that package.
Thanks again for helping to make Ubuntu better.
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https://bugs.launchpad.net/bugs/684127
Title:
virsh adds automatically type='raw' to a disk session
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