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Date: Fri, 25 May 2012 12:28:23 +0100
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From: Stefan Hajnoczi <stefanha@gmail.com>
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Subject: Re: [Qemu-devel] The image size of instance VM keeps growing
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To: Michael Tokarev <mjt@tls.msk.ru>
Cc: =?Big5?B?IkpvbmFoLld1Ladkp2erai2s46hztW+uabOhIg==?= <jonah.wu@cloudena.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, =?Big5?B?IkNoYXJsZXMuVHNhaS29srJNrvwtrOOoc7VvrmmzoSI=?= <charles.tsai@cloudena.com>

On Wed, May 23, 2012 at 2:11 PM, Michael Tokarev <mjt@tls.msk.ru> wrote:
> On 23.05.2012 16:57, Stefan Hajnoczi wrote:
> []
>> However, the qcow2 file should not grow much beyond its virtual disk
>> size. =A0So if you find the qcow2 is 3G but the virtual disk size is 1G,
>> then there is a bug. =A0But from what you've posted so far I suspect the
>> guest is simply writing to the disk.
>
> Dont't forget about possible snapshots inside the qcow2 file. =A0So it
> is quite well possible to have qcow2 file sized much larger than virtual
> disk size :)

Right.  I said this earlier: "(assuming you are not using qcow2
snapshots where the file can grow arbitrarily)"