Update for Hyper-V to support 24 logical processor systems

Update for Hyper-V to support 24 logical processor systems

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Last week we released an update that enables Hyper-V to run on systems with 24 logical processors.  For example, a quad processor 6-core system.  The update also allows you to run up to 192 virtual machines on such a system.  A couple of things to note:

  • This update does not allow you to run more virtual machines on 16 logical processor or smaller systems.  Our supported limit is 8 virtual processors per logical processor, 8 times 24 is 192.
  • Unless you are running on a system with greater than 16 logical processors, there is no need to install this update.
  • Once you install the update on the parent partition, you will need to update the integration services inside the virtual machine.

Otherwise you can get the update from here: http://www.microsoft.com/downloads/details.aspx?FamilyID=fe36823a-7e5a-4262-9bf5-d6b3ae3ad375&DisplayLang=en


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  • OK, obvious question: why limit to 24 logical processors, when Windows supports 64 in a 64-bit OS? Is it simply that this is the most you've currently tested with?

    32-core (8 socket/quad-core) Opteron systems are available, such as Sun's Sun Fire X4600 M2.

  • Can you describe the background on the virtual/logical ratio.

    Is this just a limit you have chosen to support, or do you maintain data structures which support that, by CPU?

    Can I assign 40 Virtual CPUs to 4 Logicals and use 20 Virtual CPUs on the remaining 4 Logicals (total of 60v for 8l).



  • These limits are the ones that we have tested and officially support.  There are no hard coded limits in the system - but we know from our testing that you may encounter performance  / stability issues if you go beyond these limits.



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