On 06/21/2011 07:14 AM, Stefan Hajnoczi wrote: >> This new virDomainBlockCopy API is different. It can be used when you have a >> disk image (no matter what kind) stored somewhere and you need to copy it >> somewhere else. It takes two different and independent images, one currently >> assigned to a virtual block device and a new unassigned one, copies all data >> from the old one to the new one and reconfigures the block device to use the >> new image. Neither of the image formats has to be even capable of backing >> images. > > Right. This sounds related to my thread on snapshot capabilities, where if the disk is not in a format where qemu can do a live snapshot, then libvirt needs a command to pause guest I/O, libvirt snapshots the disk, then libvirt informs qemu that the block device has a new image. -- Eric Blake eblake@xxxxxxxxxx +1-801-349-2682 Libvirt virtualization library http://libvirt.org
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