What Does %b (or %Busy) Actually Mean in the Output of iostat(1M)?

(Doc ID 1003635.1)

Last updated on JANUARY 06, 2018

Applies to:

Solaris Operating System - Version 8.0 and later
Solaris x64/x86 Operating System - Version 8 6/00 U1 and later
All Platforms
*** Reviewed for currency 06-January-2018 ***


The %b (sometimes referred to as %Busy) column as reported in iostat is often misunderstood.

This document attempts to describe what it actually means.


Sign In with your My Oracle Support account

Don't have a My Oracle Support account? Click to get started

My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms