Virtual host issue

Hi experts,

Im having AIX 5.3L , DB2 9.1 , ECC 6.0.

i have install PRD server on HACMP. with active- active scenario as per SAP guide it says use virtual host.

But my HA partner is saying there is no virtual host funda in HACMP or os level. It may be created thru SAPinst

please guide me regarding vhost & IP.

regards

Sachin G.