I found this topic which is pretty much the question I am asking about, but I wanted more info on it: http://www.sql-server-performance.com/forum/topic.asp?TOPIC_ID=2235&SearchTerms=simple,recovery Basically, I have a database that is in simple recovery mode. We're upgrading our server soon and were trying to figure out how many backplanes to purchase in order to maximize performance. My thought was that you really didn't need to put the transaction log on its own array/backplane if it's not really being used (because of the simple recovery model). However, the above-mentioned thread had two people recommending that the transaction logs be put onto a separate RAID array, but they didn't really say why it would be better, performance-wise. Can anyone give me a quick summary of this?