http://wiki.centos.org/HowTos/Xen/InstallingCentOSDomU In reading that How To, will using the GUI Configuration Tools create all the files need to run a "DomU". Will I have manual edit any configuration files? Next question is the machine has 256MBs of ram and Dom0 uses about 225MBs of it. Is that a bit much? VmWare Server does not use that much ram. See #top Below....With out running the Xen Kernel it has no where near the ram usage as with the Xen one. Is that expected? top - 11:32:53 up 5:22, 1 user, load average: 0.00, 0.00, 0.00 Tasks: 101 total, 3 running, 96 sleeping, 1 stopped, 1 zombie Cpu(s): 2.0%us, 0.7%sy, 0.0%ni, 97.4%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 231424k total, 228784k used, 2640k free, 20636k buffers Swap: 524280k total, 16k used, 524264k free, 99324k cached -- ~/john OpenPGP Sig:BA91F079