Re: [Xen-users] Copy on write Disk Images

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

There's support for an virtual disk type (I think it's tap:qcow) in the 
blocktap driver which allows you to use QEmu's QCow format to store deltas.  
Support for this has certainly been in -unstable, I don't recall if it made 
it into 3.1.

You can't switch a disk to be COW "on the fly" so you'd need to configure it 
like that on boot.

I'm not sure how much you're able to control the COW process under Xen (i.e. 
starting a new COW file, layering delta files etc).

>
> I've seen some of the projects listed on
> http://wiki.xensource.com/xenwiki/COWHowTo but am not sure if something
> like this is actually possible.

There are various DM and LVM snapshot techniques which can also do various 
kinds of snaphots.

Cheers,
Mark

-- 
Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

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