Boot Virtual Machine from a CD

vm.cfg must be like this

disk = ['file:/OVS/running_pool/121_SRVAXIPMI180_RedHatES_51_Tomcat_DVLP/System.img,hda,w',
'file:/OVS/running_pool/121_SRVAXIPMI180_RedHatES_51_Tomcat_DVLP/Data.img,hdd,w',
'file:/OVS/iso_pool/"YOUR_ISO_GROUP"/rhel-5.1-server-x86_64-dvd.iso,hdc:cdrom,r',
]

or like this, it's depend where is your DVD_ISO

disk = ['file:/OVS/running_pool/121_SRVAXIPMI180_RedHatES_51_Tomcat_DVLP/System.img,hda,w',
'file:/OVS/running_pool/121_SRVAXIPMI180_RedHatES_51_Tomcat_DVLP/Data.img,hdd,w',
'file:/root/rhel-5.1-server-x86_64-dvd.iso,hdc:cdrom,r',
]