Re: [Xen-users] Live DemoCD / cow? storage

[Paul Archer <parcher@xxxxxxxxxxx>]

On Wed, 6 Apr 2005, Martin Maney wrote:

> On Wed, Apr 06, 2005 at 08:25:04AM -0300, Fernando Maior wrote:
> > They are really useful, I have a configuration
> > with one host machine with 8 UML virtual machines
> > inside, all of them using only one root partition
> > image, each of them having their exclusive cow file.
> > 
> > Yet, I do not know how to use them from Xen. If you
> > are interested, go ahead and ask.
> 
> UML's COW facility is a UML-specific implementation.  The only
> general-purpose implementation I know of offhand would be to use LVM's
> snapshotting capabilities, but that seems not to be the best-tested
> part of LVM (or perhaps it's just that you have problems if it uses all
> the space you allocated for it).
> 

There's also UnionFS (http://www.linuxjournal.com/article/7714), although
I haven't tried it with Xen yet.

Paul


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