This isn't the article I was thinking of, but it does have some perspective and approach for this: http://sqlblog.com/blogs/merrill_aldrich/archive/2009/10/29/using-historical-perf-counters-for-storage-planning.aspx
[font="Times New Roman"]-- RBarryYoung[/font], [font="Times New Roman"] (302)375-0451[/font] blog: MovingSQL.com, Twitter: @RBarryYoung[font="Arial Black"]
Proactive Performance Solutions, Inc. [/font][font="Verdana"] "Performance is our middle name."[/font]