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vSphere High Performance Cookbook

You're reading from   vSphere High Performance Cookbook A cookbook is the ideal way to learn a tool as complex as vSphere. Through experiencing the real-world recipes in this tutorial you'll gain deep insight into vSphere's unique attributes and reach a high level of proficiency.

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Product type Paperback
Published in Jul 2013
Publisher Packt
ISBN-13 9781782170006
Length 240 pages
Edition 1st Edition
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Author (1):
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Prasenjit Sarkar Prasenjit Sarkar
Author Profile Icon Prasenjit Sarkar
Prasenjit Sarkar
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Toc

Table of Contents (15) Chapters Close

vSphere High Performance Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
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 and vCenter Database for Best Performance 8. Virtual Machine and Application Performance Design Index

Performance impact of queuing on the storage array and host


There are several storage queues:

  • Device driver queue

  • Kernel queue

  • Storage array queue

The device driver queue is used for low-level interaction with the storage device. This queue controls the number of active commands that can be on a LUN at the same time. This number is effectively the concurrency of the storage stack. If you set the device queue to 1 then each storage command becomes sequential.

The kernel queue is an overflow queue for the device driver queues. This queue enables features that optimize storage (it doesn't include them; they are built using the queue). These features include multi-pathing for failover and load balancing, prioritization of storage activities, which is based on virtual machine and cluster shares, and optimizations to improve efficiency for long sequential operations.

For example, batching several incoming read requests and doing hashes 1, 4-7, and 14 together because they're all on nearby parts of the...

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