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Re: [Xen-devel] large overhead with blktap2/vhd

from [Bastian de Groot]

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Subject:	Re: [Xen-devel] large overhead with blktap2/vhd
From:	Bastian de Groot <degroot@xxxxxxxxxxxxx>
Date:	Thu, 24 Jun 2010 13:15:21 +0200
Cc:	Christian Samsel <csamsel@xxxxxxxxx>
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Am Donnerstag 24 Juni 2010 10:41:30 schrieben Sie:
> Am Mittwoch, 23. Juni 2010, 17:26:05 schrieb Bastian de Groot:
> > Hi everybody,
> >
> > I am searching for a copy-on-write solution for Xen and tested blktap2
> > with the vhd backend.
> >
> > My Test:
> >
> > I've created a master-image with "dd" and installed WindowsXP on the
> > image. Then I used vhd-util to create a copy-on-write-image for the
> > master-image.
> >
> > After booting the VM and logging in the, the cow-image had a size of 260
> > MB. That's a little bit weird, because I didn't really changend any data.
>
> Just one word: swap.
>
> Christian

Good guess! I've tested it with deactivated swap in WindowsXP, but it didn't 
have any effect. The results were the same.

Bastian

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