dio
dio is a device I/O analysis tool for Solaris. It provides useful measurements of device performance. The output from dio includes real-time access to read rate, percentage of time that the disk (or metadevice) was busy and maximum read rate. It works within a standard UNIX terminal.Existing tools such as sar -d and iostat are very useful, but dio allows users to visualise data flow to and from a device in way that has so far been unavailable. In addition it provides maximum I/O rates and totals that give the user a clearer picture of the usage of their I/O systems. It is the combination of clear data presentation and more useful I/O metrics that makes dio such a powerful tool.
Go to the examples page to see a selection of ways in which dio can be used to tackle a range of common Solaris issues.
!! NEW !! Version 1.5 released October 2002. You can download it here and click here to find out what's new in this version.