On 05/17/2012 09:34 AM, Richard W.M. Jones wrote: > From: "Richard W.M. Jones" <rjo...@redhat.com> > > This produces a qcow2 file which is the difference between > two disk images. ie, if: > > base.img - is a disk image (in any format) > modified.img - is base.img, copied and modified > > then: > > qemu-img diff -b base.img modified.img diff.qcow2 > > creates 'diff.qcow2' which contains the differences between 'base.img' > and 'modified.img'. Note that 'diff.qcow2' has 'base.img' as its > backing file. > > Signed-off-by: Richard W.M. Jones <rjo...@redhat.com> > Cc: Matthew Booth <mbo...@redhat.com> > Cc: Pablo Iranzo Gómez <pablo.ira...@redhat.com> > Cc: Tomas Von Veschler <tvv...@redhat.com>
Regarding the documentation and command overview: Reviewed-by: Eric Blake <ebl...@redhat.com> Regarding the actual logic used in computing the diff, I did not closely look at that, and you would be wise to get a review from someone more familiar with block dev operations. -- Eric Blake ebl...@redhat.com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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