Hyper V host low on memory but still running??

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    Ghostrocket
    Member
    #166885

    Hi all

    So i have a Hyper V 2008 R2 lost with 36GB memory according to Virtual Machine Manager it has 202mb remaining.

    I am baffled how it is still running as I understand that the OS reserves 2GB approx and the host needs about 2GB
    None of the vm’s are using dynamic memory, so is its just when you use dynamic memory that the host reserves memory.
    Or does the host hold back memory when using static memory within vm’s as well ?

    Thanks for any pointers

    JeremyW
    JeremyW
    Moderator
    #271434

    The 2GB is an estimate and best practices for making sure the host has enough RAM to function. The host will not hold that amount free and will use up as much RAM as it needs up to what is available. The 202MB free you see in VMM (I recommend dumping VMM btw) is what was reported as free by the OS at the last polling. It doesn’t have anything to do with how much RAM is assigned to VMs. If you have no VMs and an application with a memory leak on the host that uses all but 202MB, VMM would report 202MB free on the host even though no VMs are running and use RAM.

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