====== Xen Boot ======

  * install centOS 5
    * make sure to install the Virtualization packages
    * and include the sub-packages which is under the details button
  * modify the grub boot with:
<code>
kernel ** irqpoll noapic acpi=off
</code>

  * [[http://xmodulo.com/how-to-install-additional-packages-in.html|Base Linux Repos]]

===== Configure =====

  * Check your device-mapper table using dmsetup table. If it's in there, clear the mapping with dmsetup remove <name>.
<code>
yum repolist enabled
yum --enablerepo=base --disablerepo=citrix
sed -i -e "s/enabled=0/enabled=1/" /etc/yum.repos.d/CentOS-Base.repo
yum update

dmsetup table
dmsetup remove <name>

mdadm --create --verbose /dev/md0 --level=5 --raid-devices=4 /dev/sd[c-f]
mdadm --verbose --detail --scan > /etc/mdadm.conf
pvcreate /dev/md0
xe sr-create content-type=user type=lvm device-config:device=/dev/md0 shared=false name-label="Big Disk"
</code>