Sun Storage 7320 system

[Gustav]

Hi All,

Can someone please give some advise on the following?

We are installing a 7320 with 2 18 GB Write Accelerators, 20 x 1 TB disks and 96 GB of ram.

Postgres will be running on a Oracle x6270 device with 96GB of ram installed and two quad core cpus, with a local WALL on 4 hard drives, and 7320 LUN via 8GB FC.

I am going configure the 7320 as Mirrored with the following options available to me (read and write cache enabled):
Double parity RAID
Mirrored
Single partiy RAID, narrow stripes
Striped
Triple mirrored

Was does the above mean in real terms officially,
and what is optimum for a (Postgresql 9, or any performance tips for Postgres on a 7320) database high writes,
and are there any comments that can help us improve performance?

Thanks, all feedback will be appreciated!