You almost always want to install the Host Utilities Kit in a SAN environ.
It's almost guaranteed that if you open a support case, they'll ask you to run diagnostics included in the HUK.
I haven't checked the downloads lately.
The DSM is s'posed to be included with the HUK, but I don't think the HUK is included with the DSM ?
Most of my clients just use the native Microsoft DSM ...
I hope this response has been helpful to you.
At your service,
Eugene E. Kashpureff, Sr.
Independent NetApp Consultant http://www.linkedin.com/in/eugenekashpureff
Senior NetApp Instructor, FastLane US http://www.fastlaneus.com/
(P.S. I appreciate 'kudos' on any helpful posts.)