first this is the iso
http://httpupdate.cpanel.net/cPanel-CentOS-6.4-x86_64.iso
always get lattest from this url
http://httpupdate.cpanel.net/
ok lets start
log in to the host server ssh
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cd /
mkdir /isolib
wget http://httpupdate.cpanel.net/cPanel-CentOS-6.4-x86_64.iso
xe sr-create name-label=isolib type=iso device-config:legacy_mode=true device-config:location=/isolib content-type=iso
[/php]
finished then go create virtual vm and install centos if any question comment me