My Oracle Support Banner

What Does %b (or %Busy) Actually Mean in the Output of iostat(1M)? (Doc ID 1003635.1)

Last updated on MAY 17, 2023

Applies to:

Solaris Operating System - Version 8 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.


To view full details, 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 a vibrant support community of peers and Oracle experts.