Hello wdzhang,
As Gurave mentioned, VCS has nothing to do with storage unless ofcourse if you wish to pass control to VCS for import / deport of Disk Groups, mount / unmount of file systems. So it can very well run without storage. You can just follow the installtion procedure of VCS as outlined in installation guide of VCS. You can locate the installation guide from the following link:
http://sfdoccentral.symantec.com/
Two dedicated heartbeat link we suggest and you may keep public interface as the low priority link to add further redundency. To know more please look into the admin guide and you can find the same from the above mentioned link.
Regards,
Dev