* Jez T:

No. The SA5300 must also have the RAID6/ADG option which was optional on
the SA5302:

http://h18004.www1.hp.com/products/quickspecs/10640_div/10640_div.html

So a SA5302 won't do. The same is valid for SA5304 which were sold as
SA5302 originally and upgraded to SA5304 later.

Wrong.
--- Quote ---
Smart Array 5300 Controller
The Smart Array 5300 series of high-performance Ultra3 array controllers
snip innovative modular design and new Advanced Data Guarding (RAID ADG)
technology.
--- End Quote ---

So all SA5300 series controllers can do ADG.

Nope. You probably didn't read the complete text:

--- quote ---
NOTE: RAID ADG is a standard feature of SA-5304 and available as an
option to other models. RAID ADG requires a minimum of 64-MB
battery-backed cache.
--- end of quote ---

Benjamin