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I run RedHat Linux 9 and discovered that iostat is preinstalled on my system.

It might make sense to run this as a cron job and send it's output to a file for future review. This way you could receive a report over a longer time period without tying up a console screen. Simply using something like this: iostat 15 10 >> /var/log/iostat
would give you a list in a log file. You would want to be sure you rotate this log using the automated process that rotates other logs. Time the process to see how long it takes to run, then add it to your cron table.