You also need to verify that the log LUNs are RAID10 and the data LUNs are RAID5 (typically that is the best performance).
If you're going to put both tempdb mdf files and ldf file on the same raid set, be sure to get RAID10 and not RAID5.
SQL DBA,SQL Server MVP(07, 08, 09) A socialist is someone who will give you the shirt off *someone else's* back.