FreeBSD - How to check device or CPU performance

Platform :
FreeBSD

Purpose :
Monitoring disk read/write activity.

Command :
iostat


Installation :
The "iostat" command comes with the base installation.

Useful switches :
-w == update frequency, in seconds
-d == only show devices, hdd related
-C == show CPU activity only

Example :

• display hard disk activity
  

  iostat -d -w1

• display only a particular hard disk activity
  

  iostat -d -w1 ad0

• display only CPU activity
  

  iostat -C -w1

Others :
For more info on what does the header means, chekc out the manual pages for iostat

Shalom !!!