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Why does a virtualised "Windows XP" running under "Hyper-V Server 2008 R2" use only one of the four allotted virtual processors?

Posted on 2010-11-18
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Last Modified: 2012-05-10
We used the disk2vhd tool to convert a running Windows XP Professional system with a quad-core processor, and attached the resulting image to a guest running under Hyper-V Server 2008 R2.

This VM has 4 virtual processors allotted to it. Everything seems to be normal ("new" hardware required drivers, etc.), but taskmgr shows only one of the allotted 4 uP being used; Device Manager lists all 4 uPs though. Has anybody else encountered this problem before? If so, how can this be resolved (the VM needs 4 uPs for our work).

Is this a potential licensing issue?
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Question by:ozjonno
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by:kevinhsieh
ID: 34170866
Install/reinstall the Integration components. It is also possible that you can only use 2 virtual processors, because the desktop OSes only support 2 CPUs. Your XP box was on a single physical CPU that was multicore, but there is no such thing (yet) as a multicore virtual CPU.
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by:ozjonno
ID: 34185035
We had doubts about the HAL ourselves and tried installing "integration services," but the HAL upgrade process keeps prompting for a reboot and never gets installed.
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by:kevinhsieh
ID: 34185180
Can you uninstal the Integration Services and reinstall them?
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by:ozjonno
ID: 34185394
Have done that many times before. The following dialog boxes show up after we "insert" the integration services "disk" into the VM:

*HAL Upgrade Required*
"Prior to installing Hyper-V integration services, the HAL in this virtual machine must be upgraded. This will require a reboot of the virtual machine before continuing with the installation process. Are you sure you want to do this?"
[select Yes]

*Hyper-V integration services*
"Upgrading HAL" (activity-bar)

*Restart Required*
"You must restart your system before Hyper-V integration services can be installed. Do you want to restart now?"
[select Yes]

The system then restarts, and after logging in, the "HAL Upgrade Required" dialog shows up again. Seems like it's caught in an endless loop.
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by:kevinhsieh
ID: 34185619
You can try to use the Windows Installer Cleanup Utility to remove the Integration Services from the Windows Installer Database and rerun the installation. I would have a backup of the VM before doing that. Another option is to try to redo the P2V conversion.
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by:ozjonno
ID: 34185821
Given that disk2vhd isn't really a P2V tool, could you suggest some other app to achieve that?
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kevinhsieh earned 500 total points
ID: 34185878
Use System Center Virtual Machine Manager if you have it. If not, here's a post that suggests using a 15 day free trial of some Acronis software.

http://williamfaulkner.co.uk/2009/01/easy-physical-to-virtual-p2v-for-hyper-v/
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