Ok, so a LUN for data and a LUN for Logs, etc. What about a LUN per data file? My Db has 5 data files. Should I put each data file on it own dedicated LUN or is it a moot point and I should get back to 1 data file on a single LUN. I have read that your should have a LUN per processor. I know this is a challenge to administer, but I am trying to plan to extreme growth.

Same question about tempdb. Should tempdb be consolidated back to 1 data file instead of spread across multiple LUNS?