VMWare ESXi: will reservation do same as resource pool?


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)?

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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
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)

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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.
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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