You'll find how busy your individual disks are that way, plus a BUNCH of other things, but that's probably the most important.

We have just added a new tool to the "Tools and Utilities" download area on the NOW site, for exactly this purpose. It is called the "Per-Volume Performance Stats Tool", written in Perl. You can either use it through a web interface (you install it behind a Windows or UNIX web server and talk to it through your browser) or use a CLI version that is also included. The URL for the tool is:

http://now.netapp.com/NOW/download/tools/pvstats/

Please check it out, and we're certainly interested in any feedback on it - we intend to do more in the area of performance tools, and your input always has an effect.

...Tim Thompson...Network Appliance, Inc...