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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 2. Memory Performance Design FREE CHAPTER 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

Impact of VM swap file placement


The creation of a VM's swap file is automatic. By default, this file is created in the VM's working directory, but a different location can be set.

Swap file contains swapped memory pages and its size is determined as allocated RAM size—reservation. If performance is important in the design, 100 percent memory reservations should be created, causing no need to swap to disk.

You can optionally configure a special host cache on an SSD (if one is installed) to be used for the swap to host cache feature. This swap cache is shared by all the VMs running on the host. In addition, host-level swapping of the VMs' most active pages benefits from the low latency of SSD. The swap to host cache feature makes the best use of potentially limited SSD space. This feature is also optimized for large block sizes where some SSDs work best.

If a host does not use the swap to host cache feature, place the VM swap files on low latency, high bandwidth storage systems. The best choice...

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