Use iostat to display informations about CPU statistics, input/output statistics for devices, partitions and network filesystems (NFS).

The basic syntax for the iostat command is:

iostat [delay [count]]
The delay between updates in seconds. If no delay is specified, only one report is printed with the average values since boot.
Number of iterations. If no count is specified and delay is specified on command line, count defaults to infinity.

Reports from iostat Command
Report CPU statistics (one iteration): iostat
Report disk statistics every 1 second, 10 iterations iostat -d 1 10
Report extended disk statistics iostat -dx
Report disk statistics for /dev/sda1 partition iostat -d sda
Report network filesystem (NFS) statistics iostat -n