LinuxQuestions.org - Xenserver HA cluster with 2 nodes installing VM os error

I am pretty new to xen techonology.I have followed this link http://www.halizard.com/images/pdf/i...wto-1.2.11.pdf to setup HA xens cluster using two nodes. I have done all this using two physical desktop computers for testing as well as by creating two xenserver in virtual box on my laptop. All setup well and seems works fine. But the problem is..

When I create new VM in xencenter pool and try to install Centos 6.4 on the VM, it gives an error "Unable to read group information from repositories This is a problem with the generation of your install tree"

I have googled about the problem. Went through this post http://www.linuxquestions.org/questi...n-from-876211/ Does not seems to relevent to my issue. Also tried and following other post on google. I have downloaded the other ISO image of centos. Also tried to install from CD drive instead of ISO image in virtual box. Also tried to install from bootable USB. It is the same error.

Please any body can help.

I am using xencenter on windows 7 virtual machine in virtualbox on my laptop to access/manage cluster.

As i mentioned earlier i have setup test environmnet on two places

1 Two physical desktops computer installed xenserver 6.1
2 Two virtual machines on Virtual box each installed xenserver 6.1

I have spent 4-5 days on this.. No idea what is the issue. On my laptop i have fedora 19, virtual box 4.2.16. Strange thing is, gettingt the same error in two test environment. It seems somthing to do with DRBD/iscsi/HA-lizard. Thease all are new for me. Any help please?

Please let me know if i need to provide more information