On Wed, Jun 24, 2015 at 16:48:16 +0800, Shanzhi Yu wrote:
On 06/24/2015 03:11 PM, Peter Krempa wrote:
qemu returns error but only in the event after the block job actually starts. Reject it upfront for a better error message.
Instead of: $ virsh blockcopy vm hdc /tmp/raw.img --granularity 4096 --verbose --wait error: Block Copy unexpectedly failed
You will now get: $ virsh blockcopy vm hdc /tmp/raw.img --granularity 4096 --verbose --wait error: unsupported configuration: granularity can't be used with target volume format
This can't avoid the cases that the source file has a raw format file as backing file.
AFAIK if the active image (top layer) is a qcow2, then the destination is also created as a qcow2 and thus the persistent bitmap granularity should work just fine. Peter