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Cluster Limitations with different CPU

    Question

  • Our sales guy recently purchased a new blade for a customer's existing 2-node hyper-v cluster. He didn't pay attention to the cpu of the existing servers and purchased a newer model.

    The newer blade has an E5-2667 v4 @ 3.2GHz 8 core X 2

    The existing blades have E5-2650 v3 @2.3 10 core X2

    I'm familiar with the compatibility mode for migrating between these hosts but I'm noticing some inconsistencies.

    For example, I'm able to migrate a guest running 2K12 STD between hosts WITHOUT configuring 'compatible mode'.

    I am not, conversely, able to migrate a guest running 2K8R2 with out configuring that option.

    What are the limitations of my VMs while running one server with a faster processor? Is it OS dependent? That is how it appears at this point. Are there any other caveats which should be addressed or noted which will make this less cumbersome for the client or am I better off downgrading the processors?

    Any info on the subject would be greatly appreciated.

    Thanks!

    Kevin Jacobson

    System Engineer


    K. JACOBSON

    Wednesday, February 1, 2017 12:49 AM

All replies

  • Hi,

    >>Is it OS dependent? That is how it appears at this point.

    As far as I know, it's not OS dependent.

    The compatibility mode is needed because of the different Instruction set architecture (ISA) extensions of different processors.

    Here are the details:

    https://technet.microsoft.com/en-us/library/dn859550%28v=ws.11%29.aspx?f=255&MSPPError=-2147217396

    >>Are there any other caveats which should be addressed or noted which will make this less cumbersome for the client or am I better off downgrading the processors?

    If you choose not to downgrade the processor, I suppose using compatibility mode would not have much noticeable differences on performance.

    Best Regards,

    Leo


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    Wednesday, February 1, 2017 6:00 AM
    Moderator
  • I agree with Leo that it is best to simply set your VM processors to compatibility mode instead of downgrading the processors.  You will not notice any performance difference.

    . : | : . : | : . tim

    Wednesday, February 1, 2017 1:07 PM