From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43)
	id 1FxkRW-0004Nu-Os
	for qemu-devel@nongnu.org; Tue, 04 Jul 2006 08:55:54 -0400
Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43)
	id 1FxkRV-0004N1-13
	for qemu-devel@nongnu.org; Tue, 04 Jul 2006 08:55:54 -0400
Received: from [199.232.76.173] (helo=monty-python.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.43) id 1FxkRU-0004Mr-Na
	for qemu-devel@nongnu.org; Tue, 04 Jul 2006 08:55:52 -0400
Received: from [84.96.92.61] (helo=sMtp.neuf.fr)
	by monty-python.gnu.org with esmtp (Exim 4.52) id 1FxkfA-0002uk-I0
	for qemu-devel@nongnu.org; Tue, 04 Jul 2006 09:10:00 -0400
Received: from [84.102.211.189] by sp604002mt.gpm.neuf.ld
	(Sun Java System Messaging Server 6.2-5.05 (built Feb 16 2006))
	with ESMTP id <0J1V0021WP1H2630@sp604002mt.gpm.neuf.ld> for
	qemu-devel@nongnu.org; Tue, 04 Jul 2006 14:22:29 +0200 (CEST)
Date: Tue, 04 Jul 2006 14:22:22 +0200
From: Fabrice Bellard <fabrice@bellard.org>
Subject: Re: [Qemu-devel] QCow v2
In-reply-to: <46d6db660607040513t230e37c6h40cd3de3f91a76bd@mail.gmail.com>
Message-id: <44AA5D7E.9020707@bellard.org>
MIME-version: 1.0
Content-type: text/plain; charset=us-ascii; format=flowed
Content-transfer-encoding: 7BIT
References: <1151981142.5476.13.camel@localhost.localdomain>
	<44AA33AD.3030300@bellard.org>
	<46d6db660607040344i7bc7e4cbx83fc424a6ebefa8a@mail.gmail.com>
	<Pine.LNX.4.63.0607041300320.29667@wbgn013.biozentrum.uni-wuerzburg.de>
	<46d6db660607040414m561b7af7h45d50f7a1d6296da@mail.gmail.com>
	<44AA5057.4090306@bellard.org>
	<46d6db660607040513t230e37c6h40cd3de3f91a76bd@mail.gmail.com>
Reply-To: qemu-devel@nongnu.org
List-Id: qemu-devel.nongnu.org
List-Unsubscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/pipermail/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: qemu-devel@nongnu.org

Christian MICHON wrote:
> how do I test it unless I implement it?
> Is it enough to split the qcow into the clusters, compress each one of
> them, then add the total files sizes ?

Yes.

> how to split into individual clusters a qcow image ?

A good approximation is to use an uncompressed qcow image, or even a raw 
image in which you exclude the empty clusters.

Fabrice.