Chethan Kumar has recently updated the Performance Troubleshooting for vSphere 4.1 guide. This is a great asset I use regularly for any client or partner that asks about vSphere performance – especially those working with Tier 1 applications. It is very educational and addresses the most common scenarios clients experience.
“The hugely popular Performance Troubleshooting for VMware vSphere 4 guide is now updated for vSphere 4.1 . This document provides step-by-step approach for troubleshooting most common performance problems in vSphere-based virtual environments. The steps discussed in the document use performance data and charts readily available in the vSphere Client and esxtop to aid the troubleshooting flows. Each performance troubleshooting flow has two parts:
1. How to identify the problem using specific performance counters.
2. Possible causes of the problem and solutions to solve it.”
It is located here: http://communities.vmware.com/docs/DOC-14905