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Second processor not showing up in the task Manager on Windows 2003 server running on Hyper-V

Posted on 2010-09-16
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Last Modified: 2012-05-10
Hi,

I've imported a Win 2003 server  machine from V-server 2005 into Hyper-V and assigned it two processors from 4 available to the host. Two processors show up in the device manager but only 1 in the Performance section of Task Manager.  Any ideas?
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Question by:wannabecraig
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by:woodmouse
ID: 33692455
Did the Win2003 server had 1 cpu dedicated in V-Server 2005 ?
Then your HAL is being dedicated with 1 cpu only, you should try to update the HAL (search for unitomp)... you cannot simply add a second CPU when you primarily installed it with one CPU.

What I try to do in this case, is to backup the old server with a universal restore option (Symantec Livestate has this, and Acronis Backup & Recovery has this option as well)...
When restoring the image to the HyperV server, you then mostly have the availibitly to your second core...


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by:wannabecraig
ID: 33692475
OH, in ESX if it's built with only one CPU, even if imported from a physical box, another CPU can be added at any time. As said, the second CPU shows up in the device manager.
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by:wannabecraig
ID: 33692484
Search for "unitomp" shows up nothing to do with MS or computers/
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by:woodmouse
ID: 33692565
Sure thing - it will show up in your device manager - it sees it's there, but your HAL is built for one CPU.
This was done during installation... that's why it won't show in the taskmanager.

Try googling "hal unitomp" - indeed "unitomp" doesn't work out on google :)
The first hit, is about XP, but since it is the same kernel, you might be able to pull some info on that one.
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wannabecraig earned 0 total points
ID: 33693352
Actually that's a very long way about it and not sure it will fix it.  What I have discovered it a very easy and perfect fix for this issue.  It came as a accident while doing something else but it's prefect.

Basically I needed to install Hyper-V integrated tools in order to use RDP on the Hyper-v guest.  When I ran the install it told me it had to update the HAL first, it did this and then discovered and installed new devices.  Once it restarted after the process the extra CPU appeared in the performance section of task manager. All works perfectly now.
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