When we create a new virtual machine with cobbler / koan the xen vm 
config file is created with the following line:

disk = [ "file:/var/lib/xen/images/xennode1-disk0,xvda,w" ]

Is it possible to change this before the installation begins?

to:

disk = [ "tap:aio:/var/lib/xen/images/xennode1-disk0,xvda,w" ]

An installation with the "file" option make our running and existing xen 
virtual machines in the whole rhel5.3 cluster unresponsive ( 8 x dom0 ).

As a workaround we use now virt-install who uses tap:aio.

DG
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