If you would like to add a secondary hard disk to a guest VM (i.e., domU) on Xen, you can do the following.
First, create a disk image for the secondary hard disk on dom0, as follows:
Then edit Xen configuration for the domU guest VM to include the hard disk.
disk = ['file:/vm/dfs1.img,xvda,w','file:/vm/dfs1-disk2.img,xvdb,w']
Next, power on and boot into the guest VM.
Finally, you need to make the newly attached hard disk available to the guest VM by formatting and mounting it.
/dev/xvdb /mnt ext3 defaults 0 0
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