Did you have a look at the HP Storage Management Pack User Guide 4.2.1. http://h20628.www2.hp.com/km-ext/kmcsdirect/emr_na-c04853381-1.pdf
There are detailed information what you need to do. Basically, you need to install the HP Software for the MP on a server with the a SCOM Agent. Then you need to run the HP Storage Management Pack User Configuration Tool to connect to the 3Par. Then you need to enable a 3Par discovery rule in SCOM. It’s explained in detail in the PDF.