Howt to calculate the maximum memory that can be used in Hyper-V


  • Most of the time i start using a "rule of thumb" of 3/4:

    All VMs must not use more than 3/4 of the total physical RAM of the Host/Physical Machine

    I´t s "good guess"?

    Of course it dependes on many factors, like backup software or other components besides Hyper-V, dynamic memory and so on.

    So, i found on a BizTalk tech article the following rule:

    300 MB for the Hypervisor


    32 MB for the first GB of RAM allocated to each virtual machine


    another 8 MB for every additional GB of RAM allocated to each virtual machine


    512 MB for the host operating system running on the root partition

    It is right?

    This rule is OK? It´s a good measure?

    Friday, January 31, 2014 12:01 AM


  • Hi,

    for Windows Server 2008 and Server 2008 R2 Host OS your formular is right. For later operating Systems you don't have to worry about this since the operating systems automatically reserves the needed RAM.



    Friday, January 31, 2014 12:26 AM