VMware is glad to see that the Microsoft Exchange Server (and Performance) teams appear to have identified the prevalent cause of performance-related issues in an Exchange Server 2013 infrastructure. We have been aware for several years that Microsoft’s sizing recommendation for Exchange Server 2013 is the number one cause of every performance issue that have been reported to VMware since the release of Exchange Server 2013, and it is gratifying that Microsoft is acknowledging this as well.
In May of 2015, Microsoft released a blog post titled “Troubleshooting High CPU utilization issues in Exchange 2013” in which Microsoft acknowledged (for the first time, to our knowledge) that CPU over-sizing is one of the chief causes of performance issues on Exchange Server 2013. We wish to highlight the fact that the Exchange 2013 Server Role Requirements Calculator is the main culprit in this state of affair. One thing we noticed with the release of Exchange Server 2013 and its accompanying “Calculator” is the increase in the compute resources it recommends when compared to similar configuration in prior versions of Exchange Server. Continue reading