Here is a Link to Searchstorage.com / SAN School. This will first help you understand what a SAN is and how it works. It will then go through deploying and configuring a SAN.
The there is allot if information searchable. This would depend on the version / Vendor of your storage. Check out their sites for WHITEPAPERS etc.
Look at this document: http://docs.google.com/gview?a=v&q=cache:rq5wlIb7jBMJ:filedownloads.qlogic.com/files/driver/49836/Readme_DD-kit_RedHat.pdf+step+by+step+san+rhel&hl=en&gl=us