digitalfreak
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Contributor

Downgrade from dual to single vCPU - Server 2008

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What's the procedure (in Windows) for downgrading a VM from 2 vCPUs to 1 for Windows Server 2008? I've seen documentation for 2000 & 2003, but nothing for 2008.

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AndreTheGiant
Immortal
Immortal

Seems that there isn't a uniprocessor version:

http://technet.microsoft.com/en-us/magazine/2008.03.kernel.aspx?pr=blog

One of the low-level changes to the system is that Windows Server 2008 only includes a version of the kernel designed to work on multiprocessor systems. In the past, Windows used a version specific to uniprocessors on machines with a single CPU because that version could achieve slightly better performance by omitting the synchronization code required only in multiprocessor environments. As hardware has become faster, the performance benefit of the optimizations has become negligible, and most server systems today include more than one processor, making a uniprocessor version unnecessary.

Andre

Andre | http://about.me/amauro | http://vinfrastructure.it/ | @Andrea_Mauro

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azn2kew
Champion
Champion

It should be the same procedure still using Device Manager.

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Stefan Nguyen

VMware vExpert 2009

iGeek Systems Inc.

VMware, Citrix, Microsoft Consultant

If you found this information useful, please consider awarding points for "Correct" or "Helpful". Thanks!!! Regards, Stefan Nguyen VMware vExpert 2009 iGeek Systems Inc. VMware vExpert, VCP 3 & 4, VSP, VTSP, CCA, CCEA, CCNA, MCSA, EMCSE, EMCISA
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AntonVZhbankov
Immortal
Immortal

Windows running on 1 CPU with multiprocessor kernel loses some percents of CPU performance. Are you so concerned about these percents?


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avlieshout
VMware Employee
VMware Employee

My server only shows ACPI x64 Based PC. Not Uni- or Multi-processor.

Is this still needed in 2008?

-Arnim van Lieshout

-


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Twitter:

If you find this information useful, please award points for "correct" or "helpful".

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AndreTheGiant
Immortal
Immortal

Seems that there isn't a uniprocessor version:

http://technet.microsoft.com/en-us/magazine/2008.03.kernel.aspx?pr=blog

One of the low-level changes to the system is that Windows Server 2008 only includes a version of the kernel designed to work on multiprocessor systems. In the past, Windows used a version specific to uniprocessors on machines with a single CPU because that version could achieve slightly better performance by omitting the synchronization code required only in multiprocessor environments. As hardware has become faster, the performance benefit of the optimizations has become negligible, and most server systems today include more than one processor, making a uniprocessor version unnecessary.

Andre

Andre | http://about.me/amauro | http://vinfrastructure.it/ | @Andrea_Mauro
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avlieshout
VMware Employee
VMware Employee

Thanks for the info Andre. Didn't know that.

-Arnim van Lieshout

-


Blogging: http://www.van-lieshout.com

Twitter:

If you find this information useful, please award points for "correct" or "helpful".

Arnim van Lieshout Blogging: http://www.van-lieshout.com Twitter: http://www.twitter.com/avlieshout If you find this information useful, please award points for "correct" or "helpful".
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