Book Image

VMware vSphere Troubleshooting

Book Image

VMware vSphere Troubleshooting

Overview of this book

VMware vSphere is the leading server virtualization platform with consistent management for virtual data centers. It enhances troubleshooting skills to diagnose and resolve day to day problems in your VMware vSphere infrastructure environment. This book will provide you practical hands-on knowledge of using different performance monitoring and troubleshooting tools to manage and troubleshoot the vSphere infrastructure. It begins by introducing systematic approach for troubleshooting different problems and show casing the troubleshooting techniques. You will be able to use the troubleshooting tools to monitor performance, and troubleshoot issues related to Hosts and Virtual Machines. Moving on, you will troubleshoot High Availability, storage I/O control problems, virtual LANS, and iSCSI, NFS, VMFS issues. By the end of this book, you will be able to analyze and solve advanced issues related to vShpere environment such as vcenter certificates, database problems, and different failed state errors.
Table of Contents (16 chapters)
VMware vSphere Troubleshooting
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Installing VMware vRealize Operations Manager
Power CLI - A Basic Reference
Index

SAN performance troubleshooting


Sometimes, slow SAN performance kills your infrastructure. It can be caused due to multiple issues. This may also require you to sometimes reproduce the problem to identify the issues and to troubleshoot it. Use esxtop to troubleshoot and monitor storage performance from the vSphere host as seen in the earlier chapter. Remove volume caching in order to get the real statistics. Analyze the performance of various I/O sets. You can use free open source tools to measure I/O loads. Use IOMeter available at http://goo.gl/RnDFyS to simulate I/O loads.

Use esxtop while IOMeter is running from a virtual machine and capture the storage performance, for example:

esxtop –a –b 7 –n 700 > performance_data.out

Ensure your multi-path settings are working correctly. Use advanced techniques like Disk Alignment to ensure the data drives are aligned correctly for efficient high I/O. From your SAN, use the built-in tools, if provided, to check the SAN performance as well.