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Re: [Qemu-devel] qcow2: snapshot and resize possible?

From: Kevin Wolf
Subject: Re: [Qemu-devel] qcow2: snapshot and resize possible?
Date: Tue, 13 Sep 2011 11:51:59 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:6.0.2) Gecko/20110906 Thunderbird/6.0.2

Am 13.09.2011 11:41, schrieb Frediano Ziglio:
> Looking at block TODOs I saw qcow2 resize with snapshot. However I
> would ask if this is technical possible with current format. The
> reason is that snapshots have no size (only l1_size, QCowHeader have a
> size field) however I think that size if part of machine state and is
> not possible to compute exact size from l1_size.
> Should this resize be posted to qcow3 update?

Yes, I think it would require a format change. Maybe we should add a
field for the image size to the qcow2 v3 proposal.


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