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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.

At May 4th 2018, we released SAP applications on Hyper-V on Windows Server 2016. As a prerequisite for SAP support, make sure that Microsoft kb4093120 is installed. This patch is part of the April update package delivered by Microsoft.

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3 Comments

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  1. Former Member

    Hi Claudia,

    We are planning to migrate our SAP systems into Windows Server 2016 Hyper-V environment,

    We have been reviewing below wiki, and SAP notes, 1492000 and 1409608 to keep ourselves updated with SAP pre-requisite and Support guideline.

    https://wiki.scn.sap.com/wiki/display/VIRTUALIZATION/SAP+on+Microsoft+Hyper-V

    In the SAP Note, 1409608 , SAP confirms Hyper-v support for Windows server 2016 with Microsoft KB 4093120

    Hyper-V on Windows Server 2016, only with Microsoft KB 4093120 (Datacenter and Standard Edition; GUI and Windows Server Core) with guest operating system Windows Server 2008 (R2), Windows Server 2012 (R2), Windows Server 2016.

    For support of SAP applications with Hyper-V on Windows Server 2016, make sure that Microsoft KB 4093120 is installed on hypervisor level!
    For Microsoft’s restrictions in guest OS support of this Hyper-V version, see https://docs.microsoft.com/de-de/windows-server/virtualization/hyper-v/supported-windows-guest-operating-systems-for-hyper-v-on-windows.  ”

    Since, the blog mentions SAP support has been postponed for this environment until a resolution provided by Microsoft. I like to confirm what would be the current guideline we should follow  ?

    Thanks
    -Irfan

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    1. Claudia Baur Post author

       

      hi Irfan,

      thank you for making me aware of my post. The statement of my SAP Note 1409608 which states support of SAP applications on Hyper-V on Windows Server 2016 is correct. The hotfix I mentioned in the note, Microsoft KB 4093120, contains the resolution provided by Microsoft in its recent April update for Windows Server 2016. I just changed the note last Friday to state that SAP support with this patch works fine and I updated the post to be correct now…

      Thanks and best regards,

      Claudia Baur

      Virtualization & Cloud on Microsoft Platforms

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