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VMware ESXi 5.0 not using all available CPU and RAM?

Posted on 2012-04-11
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Last Modified: 2012-04-13
I have a "home lab" ESXi 5.0 host with 16GB RAM and about 8 VM's, two of which are running currently: a Win 7 32-bit with 1.5GB RAM (all reserved) and a Windows Server 2011 64-bit 3 GB RAM (none reserved).

1. vSphere client reports on the host summary tab having 16 MB RAM but the resource allocation tab for VM's reports only about 13GB available. (See attached.) Why is that? Is there something wrong? Note that the overhead for one VM is 45MB and for the other 90MB for a total of 135MB - nothing approaching the ~3GB difference.

2. vSphere client reports having 4 x 3.392 MHz = 13.584 MHz of CPU capacity, yet the capacity apparently available to VM's is only 11532 Mhz. (see attached.) Why is that? Is there something wrong with my configuration?
vsphere-resources.jpg
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Question by:johnnyt29
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Andrew Hancock (VMware vExpert / EE MVE^2) earned 2000 total points
ID: 37835815
(small thing, in your picture it should be 13.568GHz or 13568MHz!)

there is nothing wrong here, this is normal, and this is a common question, when VMware Admins spot it, in the Summary Tab, when comparing to Resource Allocation, and the same is true when comparing Cluster Resources against Resource Allocation.

2036MHz and 2788.27MB are reserved internally to execute the virtualisation software. (VMware Hypervisor).

In one of the VMware documents, and I cannot remember which one at present, it could be the Resources Guide, there is a phrase which states it's due to virtualisation software, or required by the virtualisation software.

So the Summary Page for the Host, is the raw, CPU and Memory in the Host, Resource Allocation is what it can actually allocate, the word "reserved" is strictly not quite true, because it can allocate out the full amount, as seen in summry pages.
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