The Intel Modular Server site has a set of documents that explore a variety of subjects from solutions built on the IMS to guides and best practices for setting up the box.
On the New Documents page, as of this writing, is a document on how to work with the built-in IMS storage.
The above guide contains a very in-depth explanation of how to work with the IMS SAN.
A good overview of the IMS SAN storage is here:
We are finding that how we configure storage in the built-in SAN as well as any Promise VTrak E-Class and VTrak JBODs connected to the IMS is absolutely critical to the overall performance of a Hyper-V cluster.
Microsoft Small Business Specialists
Co-Author: SBS 2008 Blueprint Book