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) Prosecutor James Blackburn, in closing argument in the Fatal Vision murders trial:
If in the future, you should cry a tear, cry one for them [the murder victims]. If in the future, you should say a prayer, say one for them. And if in the future, you should light a candle, light one for them.