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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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 Elder Elder
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Elder
Christopher Kusek Christopher Kusek
Author Profile Icon Christopher Kusek
Christopher Kusek
Prasenjit Sarkar Prasenjit Sarkar
Author Profile Icon Prasenjit Sarkar
Prasenjit Sarkar
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Toc

Table of Contents (17) Chapters Close

Title Page
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Customer Feedback
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

Choosing the reserved cluster failover capacity


By now, we all know that VMware has introduced a percentage-based cluster resource reservation model. Using this setting, you need to specify how many resources you want to reserve to accommodate a host failure. It also allows us to select different percentages for CPU and memory.

You might wonder how you would calculate how many resources you want to reserve for your HA cluster. While it was a straightforward approach when we used to select a number of hosts reserved for servicing a host failure, we have seen disadvantages as well. If you use the number of ESXi hosts failure in your HA cluster, you will reserve those completely; thus, it will not be efficient to tune into your HA cluster or put it to best use. Also, it avoids the commonly experienced slot size issue, where values are skewed due to a large reservation.

Percentage-based reservation is also much more effective as it considers the actual reservation per VM to calculate the available...

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