So without a whole lot of information regarding the unique situation you're presented with, we're left to make assumptions...
That being said, generally speaking, it should work just fine. If you were connecting say emc and 3par to the same host, you would install both the powerpath dsm, and the 3par dsm. What would happen in an ideal world is the pp dsm would claim the luns in recognizes (vnx/vmax/clariion/symmetrix/whatever) and the 3par dsm would claim the luns recognized as 3par and all would be right with the world.
I would suggest definitely testing it before trying it on a production system. In some cases it has been suggested to have a seperate hba for each vendor, but in most cases I think that's a little silly.
Can you be more specific regarding the other array, windows version, etc?
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