Appreciate your comment, dnilson
From my research so far, at least 1 core should be reserved for the host. So I would expect to pick the drop-down and select from 2 to 7 available core
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Hyper-V & Virtual Processors
I am testing (Windows 2008 Server Standard) Hyper-V for the first time on our spare server which is a dual quad-core IBM x3500 server. With 8 cores, I would like to allocate 5-6 for a virtual server. However, the vritual processor setting defaults to 1 only and is greyed out. Does it refer to the physical CPU or am I missing something - e.g. host setting or an update?
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by: dnilsonPosted on 2009-08-02 at 21:25:07ID: 25001860
Virtual CPUs ahve nothing at all to do with Physical CPUs
If you dont dedicate them, you can have more virtual CPUs than physical each running with just what it needs.
Once you start allocating cores, the ytend to lockdown to physical cores and the number you can safely run decreases quickly.
Be careful - a common nube error is assigning to many cores to a VM and getting crappy performance as a result. Brian Maddens whitapers o nCitrix under VMware opened my eyes to the benefit of one vCPU per image when ever possible, with extra images as necessary, opposed to multiple vCPUs on a common image.
This data changes as the platforms evolve you can find up-to-date recomendation on HyperV, VMware, Xens, etc at:
http://www.virtualrealityc
Not sure WHY HyperV is behaving this way check the whitepaper and I'll do a little research - you SHOULD be able to assign more than one.