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Re: [Qemu-devel] [RFC] Allow 'qemu-img convert' to preserve the backing
From: |
Ian Jackson |
Subject: |
Re: [Qemu-devel] [RFC] Allow 'qemu-img convert' to preserve the backing file |
Date: |
Wed, 28 May 2008 10:53:09 +0100 |
Marc Bevand writes:
> Currently if qemu-img convert is used to convert for example a qcow1
> image (with a backing file) to a qcow2 image, the resulting image
> will have no backing file.
This kind of thing ought to be discussed with qemu upstream too,
surely ? Perhaps even implemented there first.
> In order to preserve the backing file (to save disk space), qemu-img
> should offer a command line option to enable the feature. For this
> it needs to be made aware of BlockDrivers supporting backing files.
The best way to do this will probably involve a certain amount of
restructuring of the interface to the block drivers. So definitely
something to discuss with upstream.
Ian.