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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

Choosing the best SIOC latency threshold

Storage I/O Control (SIOC) extends the constructs of shares and limits to handle storage I/O resources. SIOC is a proportional share scheduler that, under contention, throttles IOPS. You can control the amount of storage I/O that is allocated to VMs during periods of I/O congestion. Controlling storage I/O ensures that more important VMs get preference over less important VMs for I/O resource allocation.

There are two thresholds: one for standalone SIOC and one for Storage DRS. For Storage DRS, latency statistics are gathered by SIOC for an ESXi host and sent to the vCenter Server and stored in the vCenter Server database. With these statistics, Storage DRS can make the decision on whether a VM should be migrated to another datastore.

The default latency threshold of SIOC is 30 milliseconds. The default setting might be acceptable for some...

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