VMWare ESXi: will reservation do same as resource pool?

Posted on 2014-07-17
Last Modified: 2014-07-17

Simple question: I would like to garantuee a machine/vm on my ESXi (standalone for now) 1 Ghz an 1GB ram at all times.
Can this be done by reservation or does reservation mean the 1Ghz can only be used by this machine/vm so other cannot use it at all (even if the vm is not using it)?

Question by:janhoedt
    LVL 116

    Accepted Solution

    If you use a Reservation for CPU and Memory, that will GUARANTEE RESOURCES (CPU and MEMORY) RINGFENCE for that machine ONLY.

    In effect a resource pool on a VM (per VM only)
    LVL 10

    Assisted Solution

    You can also refer to vSphere 5 Documentation Center for more detail info

    vSphere Resource Management - Resource Allocation Reservation

    vSphere Resource Management - Configuring Resource Allocation Settings

    Hope this helps.
    LVL 61

    Assisted Solution

    While related it is slightly different.
    Reserved RAM will always be guaranteed to machine
    Which means that it will never get to swap file (and as a side effect machines cannot oversubscribe ESXi RAM with reservations)
    Same wth CPU
    You can configure "minimal required" RAM reserved so that there is less memory pressure on ESXis.

    While resource pools  will give one machine upper hand on resources when under heavy stress.
     btw ESXi performance guide recommends against resource pools as they have performance impact.

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