Re: [Qemu-devel] Can qemu reopen image files?

[Stefan Hajnoczi]

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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