Interpreting Disk Queues

Disk queues are a mystery for the majority of DBAs.  They may know that they need to look at them, but they have no idea what they mean.  Here I’ll show you how to know what you’re looking at to see when your disk queues are too high.  This tutorial doesn’t go into how to fix the problem really, it’s more just how to diagnose it. 

Here's the link.