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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

What counters not to use

A lot of the time, we assume that some very popular counters would be better to monitor memory performance. However, many times, it leads to something else. This means that these are not an indication of a memory performance issue. If this counter is combined with something else, then it may indicate performance degradation.

In this aspect, don't use two of the most popular counters just to understand whether the memory is under pressure or not:

  • Mem.consumed (Consumed Memory)
  • Mem.vmmemctl (ballooned memory)

Let me show you what they essentially indicate.

The Mem.consumed counter is the amount of memory consumed by one or all VMs. This is calculated as memory granted minus memory saved by sharing. Now the question is why we should not use this. The reason is that memory allocation will vary dynamically based on the VM's entitlement. It is important...

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