Check the Hardware Compatibility List to verify the tape library's support - http://www.symantec.com/business/support/index?page=content&id=tech214803
V-Ray is licensed per socket. So, in your case, it would 8 V-Ray licenses.
Have a look @ this blog - https://www-secure.symantec.com/connect/blogs/whats-included-backup-exec-v-ray-edition
Example taken from the above blog:-
“I have 3 VMware hosts running a total of 1 million virtual machines. Each host has 2 Quad-Core CPUs. I simply purchase a 6-socket license V-Ray, correct?”. The answer is yes. There are 2 sockets per host and a total of 3 hosts. That means you would purchase 6 licenses of the Backup Exec V-Ray Edition. Since Backup Exec protects an unlimited number of guest machines per host, it doesn't make a difference if you have 1 or 100 virtual machines per host machine. Backup Exec will protect them all. There is also no limit on the number of hosts you can protect. You simply count the number of sockets in the environment you wish to protect and purchase the corresponding number of V-Ray licenses.
