i have a server constantly have high iowait, but i am not able to tell which process generate the most of io. none commands, such as iostat, sar, top will give me this kind of information.

hope there is some command can help me to spot the process generate the most of io


let to know input from all guru here. thanks

Can you provide more details about the system? What is the OS and what are the disk systems involved?

I would start with sar -d, this will let you know which disk is having a problem(if it is a disk, which is usually the case with heavy IOWAIT).

Based on what is stored on that disk you can probably start tracking down any applications what would access it.