HA for ECC 6.0 cluster setup

HI Experts,

                We are planning for our ECC system on HA, below are the environment details

SAP / DB / OS          :     ECC 6.0 / Oracle 11.2.0.3 / AIX 7.1

Node A : DB + ERS(10)

Node B : ASCS(01) + CI(00) + ERS

Node C : DI(02)

Node D : DI(03)

Here in Node A : DB & in Node B : ASCS(01) are in cluster (AIX - HACMP).

1) Kindly let me know is their any need of any DI/CI with same instance number (i.e. 00) in DB node.

2) Also request you to comment on any care if need to be taken.