XCP is basically an open-source version of Citrix XenServer.

• XCP 1.5 = XenServer 6.0
• XCP 1.6 = XenServer 6.1

http://lists.xen.org/archives/html/xen-users/2011-10/msg00539.html

• The XCP project provides no official update repository.
  • There is a 'xcp' repo for 1.6.10, but it's not fully implemented.
• Protect your management network via an non-public routable address space and you greatly reduce your dom0 attack surface.
• Do not use the CentOS 5 repo to update XCP dom0.

Update the kernel in 1.6.10:

yum --enablerepo xcp --nogpgcheck update

http://www.zultron.com/2012/09/xcpxenserver-on-raid1-booting-pitfalls/

http://blog.codeaddict.org/?p=5

http://lists.xen.org/archives/html/xen-api/2012-01/msg00000.html