Rupesh,
VVR is integrated part of vxvm, you have vxvm is already installed. For using VVR you would be creating additional components which basically will interact with DR site over network .. replication data transfer would happen majorly though vnetd (which is not a process) rather would be in kernel.... additionally u may introduce new daemons like vradmind whcich would help you running vradmin commands & vradmind would untimately interacting with vxconfigd ..
In short, this is a tested solution from Symantec, won't believe should be concerned factor unless your system fails to meet the "system requirements" for SF ..
G