[Ovirt-devel] Appliance disk format

[Daniel P. Berrange]

On Tue, Feb 19, 2008 at 10:15:45PM +0100, Jim Meyering wrote:
> "Daniel P. Berrange" <berrange at redhat.com> wrote:
> ...
> > To see if there's any further compression to be had for helping downloads
> > I tried various compression programs with the following results:
> >
> >   - gzip  - 661M
> >   - bzip2 - 662M
> >   - p7zip - 617M
> >   - rzip  - 586M
> >
> > All used their default compression levels. rzip is pretty impressive, and
> > p7zip is not too shabby. It is clearly not worth using gzip/bzip though.
> 
> Neat.  If you want maximum compression, you probably don't want to use
> the default level.

It didn't make significant different with -9 

 - p7zip -9:  601M
 - rzip -9:   580M
 - lzma -9:   611M


rzip is potentially worth using, saving 100 MBs download over the compressed
qcow2. But if we slim down the master image itself that saving will be less
sigificant.

Dan.
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