REPLICA

I have 3 sites with VNX5400... Site A, Site B and Site C.I will using Oracle RAC GPFS cluster file system with AIX7

Site A (VNX + RP + VPLEX)  to Site B (VNX + RP + VPLEX)  = Dark Fiber (Sync distance)

Site A (VNX + RP + VPLEX)  to Site C ((VNX + RP) = IP Based Republication

Site B (VNX + RP + VPLEX)  to Site C (VNX + RP) = IP Based Replication

Site A and Site B wil be Active Active on Storage Base stretch cluster 

Site A and Site B to Site C Active Passive replication base.

Can you please let me know what my options / consideration regarding above?

Best Practice procedure for above setup?

Thanks