It was truly meant for either blades using a pair of switches (say 4 C7000) or Integrity can handle dual zone. Actually iirc the P800 smartarray could but the o/s just didn't handle it very well and since its so old they don't want to rehash it for 2012. The MDS600 is still used, they just attach one half to 35 drives and the other half is 2 or 4 small blade pc's running StoreVirtual VSA .
Hooking this up to two machines (or two P812's) is definitely not ideal but the price is a steal! The bad part is to keep the power redundant you have 4 1200W power cords, that's alot of juice, essentially a common man plug 15amp circuit each.
Budgetservers has some great crap on ebay , I know their actual company and they deal in more high end hp renew but he's legit.
Here's some tips from him too:
DL320 G6 -> basically 1/2 of a dl360 -> he has $385 for E5607 and 8 hot swap with RPS - throw in your 9271/M5015/M1015 and a dual port nic and some 840's and 72gb of ram and you'll be very happy.
MSA2312sa - 3GB but a real intelligent MSA2000 that can host 4 servers (3x4gbps) (older P2000 G3 SAS) - If anyone buys I have 12 HP SATA interposers which this unit uses. It turns SATA into SAS since the 3.5" model is all SAS (Dothill makes them). The 2.5" SFF model goes for a ton more but uses regular HP 2.5" drives. Microsoft uses these and newer models in clusters. Meat and Potato storage with no frills.
8gb switch FC cheap - easy to buy the keys to activate the other ports (12 more) if you can google and read quickspecs. If you want to do FC - 8gbps you'll realize how cheap this simple 8gbps switch is. Quite possible the 20 full ports are activated if it was used.
I'll have the guy come on here since he's on my AIM and perhaps he can whip up some STH specials.
Don't go buying up all those DL320 G6
That was my secret weapon cheap box. $385 with E5620, add 9 x 8gb RDIMM ($540) with 8 ssd's (256gb 840 pro) can run a TON of hosting. The E5620 is quite a remarkable quad core - 32nm with 12MEG L3 cache - HT/TURBO - I'd dare say it could take the pepsi challenge against many newer cpu's and win with hypervisors. It has 6 sata ports too if you don't like hardware raid.