My desktop just grew by two 500GB Western Digital Caviar drives. Having installed those, I loaded Gutsy-AMD64 on one using LVM. The partition schema is as follows:

Drive: 500GB #1
Volume Group: server1
Volumes:
	swap_1 - 6GB - swap
	root_1 - 30GB - ext3 - mounted as /
	home_1 - 20GB - ext3 - mounted as /home/
Free space: ~398GB

500GB number two will probably wind up being a RAID mirror via my motherboard. This LVM layout allows me to dynamically allocate space for the many potential Xen DomUs I create.

To install Xen on Gutsy-AMD64 desktop version:
sudo apt-get install ubuntu-xen-desktop-amd64

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