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vSphere High Performance Cookbook - Second Edition

You're reading from   vSphere High Performance Cookbook - Second Edition Recipes to tune your vSphere for maximum performance

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Product type Paperback
Published in Jun 2017
Publisher
ISBN-13 9781786464620
Length 338 pages
Edition 2nd Edition
Tools
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Authors (3):
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Christopher Kusek Christopher Kusek
Author Profile Icon Christopher Kusek
Christopher Kusek
Prasenjit Sarkar Prasenjit Sarkar
Author Profile Icon Prasenjit Sarkar
Prasenjit Sarkar
Kevin Elder Kevin Elder
Author Profile Icon Kevin Elder
Kevin Elder
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Toc

Table of Contents (11) Chapters Close

Preface 1. CPU Performance Design FREE CHAPTER 2. Memory Performance Design 3. Networking Performance Design 4. DRS, SDRS, and Resource Control Design 5. vSphere Cluster Design 6. Storage Performance Design 7. Designing vCenter on Windows for Best Performance 8. Designing VCSA for Best Performance 9. Virtual Machine and Virtual Environment Performance Design 10. Performance Tools

Monitoring command queuing


There are metrics for monitoring the number of active disk commands and the number of disk commands that are queued. These metrics provide information about your disk performance. They are often used to further interpret the latency values that you might be observing.

The number of active commands: This metric represents the number of I/O operations that are currently active. This includes operations for which the host is processing. This metric can serve as a quick view of storage activity. If the value of this metric is close to or zero, the storage subsystem is not used. If the value is a non-zero number, sustained over time, then constant interaction with the storage subsystem takes place.

The number of commands queued: This metric represents the number of I/O operations that require processing but have not yet been addressed. Commands are queued and waiting to be managed by the kernel when the driver's active command buffer is full. Occasionally, a queue will...

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