[Xen-users] How was CoW implemented on the Demo LiveCD (3.0) ??

[Rickard Borgmäster <doktorn@xxxxxx>]

Hello,

I need to know what's needed to implement cow filesystem for domU the 
same way it was done on the LiveCD demo for xen 3.0. Our current project 
it is replace UML with XEN on a bootable router simulation LiveCD. We 
need to make each domU machine share the same rootfs.img. And I know it 
is possible, as it was done on the demo LiveCD. But how?
And, where can I find some documentation about domU config files disk= 
parameter? What is documented in the handbook is far from sufficient. 
Looking at the config file on the demo CD: /root/deb-conf says:
disk = ['cow:/tmp/cdrom/rootfs.img 30,sda1,w']
what does "30" mean here? A little bit hard to guess...

Right now, I've set up a xen 3.0 server for testing and mastering 
purposes. I've created a filesystem image that will work fine when not 
using cow (meaning, disk = ['file:/xen/rootfs.img,hda1,w'] in domU.cfg). 
Just changing this parameter to disk = ['cow:/xen/rootfs.img 30,hda1,w'] 
(again, what is "30" for?) gives me error;
Error: Device 769 (vbd) could not be connected. Hotplug scripts are not 
working.
Please! Share any experiences or knowledge you might have here. None of 
the project members are coders, so we cannot read source code like 
native language.
Any help is truely appreciated.

Best regards
Rickard Borgmäster


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