I just was aware of a new version of the Performance Tuning Guidelines for Windows Server 2016 which has been published by Microsoft.

It contains an amazing set of documentation that you can use to tune the server settings in Windows Server 2016, but also to configure and troubleshoot Hyper-V on Windows Server.

Where to find the Guidelines

Check the following entry point for an overview on hardware, Hyper-V and PowerShell tuning:

https://docs.microsoft.com/en-us/windows-server/administration/performance-tuning/

Some Comments…

With recent Windows Server versions, Microsoft changed the default settings for the Windows Power Plan from ‘High Performance’ to ‘Balanced’ mode. This allows customers to benefit from lower power costs during times when CPU resources are on light load levels, however it brings additional latency during these times until “sleeping” CPU resources have been “waken up” to higher frequencies again.

Therefore, the ‘Balanced’ power plan setting and recommendations of section Recommended Balanced Power Plan Parameters for Workloads Requiring Quick Response Times might be sufficient for applications where low response times are not a critical issue, however it is a no go for enterprise applications like SAP.

For SAP applications, we observed very volatile response times in single threaded processes that are executed during low processor load times when the Windows Power Plan stays with its default ‘Balanced’.

Run times of for example SAP batch jobs vary extremely, because these jobs often don’t bring sufficient load on processor resources to wake them up to highest frequency and processor frequency stays still reduced. Running these jobs, you observe quicker response times when your VM has a ‘noisy neighbor’ which keeps the CPU on higher frequency level. During night times when CPU resource consumers mostly sleep, response times of lower load applications get worst.
Just the other way round you would have expected!

Therefore, make sure to adapt the Power Plan of your Windows servers to ‘High Performance’ mode when running SAP applications.

Support of Hyper-V on Windows Server 2016

In section Detecting bottlenecks in a virtualized environment Microsoft explains the metrics needed when it comes to support of applications in Hyper-V environments.

Due to technical limitations in transparency of performance and configuration metrics of the current version of Windows Server 2016 Hyper-V, SAP cannot support its applications in this version yet. Therefore SAP support of Windows Server 2016 Hyper-V has been postponed until a suitable solution is provided by Microsoft.

You can always check SAP Note 1409608 for the most current status of Hyper-V 2016 support. This note will be kept up-to-date.

 

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