When your storage performance starts to sag, pump it up. Most data centers are dealing with ever increasing amounts of data storage. Although the need for storage seems insatiable, array performance typically plateaus or worse, degrades after installation. Storage performance tuning is a teachable, ongoing activity. The vocabulary and activities are something any administrator should be able to master within a short time. This is an introduction to storage array performance tuning and should be a first step for anyone working to improve data storage performance.