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[openstack]how to launch an instance from a disk

To: openstack@xxxxxxxxxxxxxxxxxxx
From: 敏林 <yinz3985sn@xxxxxxxxx>
Date: Thu, 24 May 2012 11:31:42 +0800

hello, I want to launch an instance from a disk. I mean a disk from a pc,
it has mbr, OS. I can use command like 'qemu file=/dev/sda' to start a vm.
how to do it in openstack?
the disk size is too large to store it using glance. can nova boot an
instance without interacting with glance?
any one has idea?