The DBV's offer a wealth of insight, more than is available to discuss here. I suggest you take some time.

Here is a complete list of DMVs, you would do well to start looking into them.

http://social.msdn.microsoft.com/Forums/en/searchserverinstallconfigandadminstration/thread/2221d017-8ae1-4940-9895-1b0ad2e357b8