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Alistar
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Expert

When you take a look at the link where the metrics are explained, you will see that Granted is a metric of:

  • Amount of machine memory or “physical” memory that is mapped for a virtual machine or a host. On a host: Sum of all granted metrics for all powered-on virtual machines, plus machine memory for vSphere services on the host.

So this is the memory VMkernel has granted (in its own physical constraints aka the memory sticks) to have everything running - various Daemons ("services" in Windows terms) inside the VMkernel (CIM Providers, HA agent, management agents, remote GUI and SSH console sessions...), Virtual Machine Worlds (world is a group of processes bound together in VMware terms), VMkernel resource scheduler itself - there are many cogs and spinning (and dynamic, at that) and literature would be your best stop to see each and every component the VMkernel is actually composed of. You can take a look via esxtop in an ssh session.while performing tasks in vCenter or in the VM itself to see how everything moves around.

And well, free memory is memory that can be allocated on-demand to any component mentioned above. Its resource management. Just go around, experiment and read on the matter - it is truly a work of art Smiley Happy

Stop by my blog if you'd like :slightly_smiling_face: I dabble in vSphere troubleshooting, PowerCLI scripting and NetApp storage - and I share my journeys at http://vmxp.wordpress.com/

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