Hi
My Recommendation. If you have some time, play a little with VIOS, create your profiles, install VIOS on one of those 2 local disks and mirror the system. Assign the HBA(s) to the VIOS profile and check your SAN disks.
There are 2 ways to work storage with VIOS, one is assigning whole disks to the VIO Client partitions and the second is creating Logical Volumes at VIOS Server level and mapping them to the VIO Clients. I rather use the first approach.
About working with SAN disks, remember that your need to configure SAN provided disk in one LPAR (VIO Server) so you have to install the proper SW driver to configure such disks. Let's say you have a EMC2 Symmetrix, you have to install the device drivers and, optionally, the EMC2 Powerpath SW. Once you have configured and seen the disks, you can create the Virtual SCSI Server Adapters and link them to the VIOS SCSI Client Adapters. The same way with you Ethernet Virtual Adapters and SEA (Shared Ethernet Adapters).
Following document might prove to be usefull.
Sys Admin > v16, i15: Configuring a Virtual I/O Server
Hope this helps