Opcenter Hardware requirements

http://www.symantec.com/business/support/index?page=content&id=TECH76770

page 44

We are running it on a VM with dual 2.8Ghz Xeon processors, 4GB RAM, 20GB C: drive for system and Netbackup client install, and 30GB F: drive for OpsCenter.

I would recommend looking at page 46 in the above technote for info on installing OpsCenter on a different drive.  We've had problems when we change our OpsCenter logging levels and were filling up our C: drive on a daily basis with thousands of log files.  Had to have Symantec enter an override in a config file that just overwrites the log file as it files up, which occurs every 3-4 seconds.