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Optimizing Linux® Performance: A Hands-On Guide to Linux® Performance Tools by Phillip G. Ezolt

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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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