I was playing with Xen and bumped into an issue which stumped me for a while. If you use the binary dstribution from the Xen site don't fall into the trap that I did. I was using the Quick Start guide on RedHat and they suggested the grub.conf should look like: (my /boot is hd0,0) title Xen 2.0 / XenLinux 2.6.10 root (hd0,0) kernel /xen.gz dom0_mem=128M ..... when in fact the xen.gz from the binary distribution does not support using M in the dom0_mem parameter. It complains that there is not enough space for the Guest OS. I should have used: title Xen 2.0 / XenLinux 2.6.10 root (hd0,0) kernel /xen.gz dom0_mem=131072 noreboot .... The noreboot is a good parameter to use for testing since without it the xen microkernel reboots after 10 seconds which is a pain when you are trying to read the error messages. :-( -- Bill