On Mon, Dec 19, 2016 at 09:07:43AM +0800, Fam Zheng wrote: > On Sun, 12/18 20:52, Christopher Pereira wrote: > > Hi, > > > > We are doing a "qemu-img convert" operation (qcow2, with compression) to > > shorten the backing-chain (in the middle of the backing-chain). > > In order to force qemu to reopen files, we do a save and restore operation. > > Is there a faster way to reopen image files using virsh or qemu? > > No, don't use qemu-img when the image is in use by QEMU. You want to use > "block-commit" command provided by QMP.
It's worth being more explicit here: You will corrupt the image file if you access it with another program while QEMU is using it! Stefan
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