iostat displays the current CPU load average and disk I/O information.
iostat (input/output statistics) is a computer system monitor tool used to collect and show operating system storage input and output statistics.
The iostat command is used for monitoring system input/output device loading by observing the time the devices are active in relation to their average transfer rates. The iostat command generates reports that can be used to change system configuration to better balance the input/output load between physical disks.
