From mboxrd@z Thu Jan  1 00:00:00 1970
From: Markus Armbruster <armbru@redhat.com>
Subject: Re: differencing disks support
Date: Thu, 09 Jun 2011 08:24:28 +0200
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References: <4DEFD70E.4020209@cdf.toronto.edu>
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Cc: kvm@vger.kernel.org
To: Iordan Iordanov <iordan@cdf.toronto.edu>
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Iordan Iordanov <iordan@cdf.toronto.edu> writes:

> Does KVM support or plan to support differencing disks (where there is
> a read-only source disk, and each person running a virtual machine can
> save block-level changes that their virtual machine is making to the
> disk in a separate "differencing" image)?
>
> If so, can somebody suggest how I may make use of this feature
> (i.e. building the newest version from source, and any other
> requirements).

Check out image format qcow2.

LVM snapshots were already mentioned.