Chapter 6. Performance Tools: Disk I/O
This chapter covers performance tools that help you gauge disk I/O subsystem usage. These tools can show which disks or partitions are being used, how much I/O each disk is processing, and how long I/O requests issued to these disks are waiting to be processed.
After reading this chapter, you should be able to
Determine the amount of total amount and type (read/write) of disk I/O on a system (
vmstat).Determine which devices are servicing most of the disk I/O (
vmstat,iostat,sar).Determine how effectively a particular disk is fielding I/O requests (
iostat).Determine which processes are using a given set of files (
lsof).
Introduction to Disk I/O
Before diving into performance tools, it is necessary to understand ...
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