Counters in vSphere and vRealize
You should spend time understanding vCenter and esxtop counters. Part 3 of the book is not meant to replace vSphere manuals. Read the vSphere documentation on this topic, as it gives you the required foundation for mastering vRealize Operations.
vSphere and vRealize Operations manuals are freely available. Just Google vSphere documentation and Google will have it readily available for you. The exact chapter you need to review is shown in the following screenshot:
The vSphere 6 Monitoring and Performance manual
The counters are also documented in the vSphere API/SDK Documentation, as shown in the following figure:
The vSphere 6 manual – the Performance Manager section
Follow the path shown, and choose Performance Manager from the list under the letter P. It lists the metrics. I have highlighted the Demand metric. As you can see, it applies to VM and ESXi, and has been available since vSphere 5.0. From the definition, you can see that this is the counter...
