Hi Ramon -

I have no idea how many disks we have unfortunately - we basically get allocated a veritas disk group which is made up from a lot of striped disks in an EMC array. All I know is that I/O is pretty fast. I guess that means I have no way of using the formula you gave since the only info I have is volumes (and is not representative of spindles).

Processor usage seems to be around 60%+ for most of the processors down to about 30% - Although our system is actually quiet in the daytime (server shared with other DB's). The bulk of our work is done overnight while other apps are backing up.