I know that I can use the iostat command to view disk activity, but I would prefer that one utility display everything in one window, like Perfmon on Windows or ActivityMonitor on Mac. Can you show it? THANKS.
Also for online use; iftop at address, nethogs executes as the process progresses.
Look iotop and nmon
Yes, nmon is a good utility that works on almost all platforms. You can write nmon entries to a file for later processing. There is an nmon spreadsheet parser that reads the nmon output file and charts for you. There are also java and python libraries on which you can create applications on nmon outputs.