Hi Sathish
I am Sorry man delay
if node 1 failed due to the any issue then all the SAP services like (SAP OSCOL etc) will move to the node 2 automatically Is it(can you explain this) .
As you said that both nodes are used. Node 1 . SAP instance + SAP Group(DNS Name to connect the SAP system) Node 2 DB & SAP Dialog(Application server) instance. If any one of the physical node fails all the Cluster resource ( Windows fail over Cluster, SAP , DB groups are moving to standby node) are moves to one node with minimum one request time out. in this case you can have fail over Cluster active / active mode. In the Cluster environment only the services are getting failover from one to another node.
In this setup both nodes SAP instance are on,
farther information you can refer the SCN link
High Availability - Frequently Asked Questions
Windows Server Failover Clustering - SAP Business Continuity - SAP Library
BR
SS