When I look at the IO usage tab in EM I seem to get different IO reports between the servers and the controllers. For example, if I add all the total IO for my servers together for one point in time I get around 2500 IO/sec. However, if I look at the IO on the controller at that time it shows around 8000 IO. I understand that the extra might be cache IO, but there is no good way to distinguish this. And if that is the case, how I do know what is real disk IO versus cache IO. Setting threshold alerts is harder to determine if I can't tell what the disk IO is by itself.

I also noticed that if I look at IO on a particular day for a server, and then look at the IO over a week, the peak IO usage doesn't match up. The days will peak out at 2300 a few times a day, but the week doesn't show any peaks above 1200. Has anyone else seen this particular behavior?

J