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VMware Host Resource Utilization

Posted on 2013-10-24
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Last Modified: 2013-10-31
If I am allocated a total of 96GHz CPU from my cluster of hosts and I have 9 VM's configured with 2GHz/Dual Core.  Am I using 18GHz of my total or 36GHz of my total allocated CPU? Or does the extra cores use more memory?  

In other words how does adding cores affect the resources given to me?
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Question by:bmclamb
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by:Steve
Steve earned 235 total points
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No. the VMCPU you assign to the VM doesn't limit the VM to a particular speed.
Your VMs will use as much CPU as the host can provide unless you have set CPU limitations in VMware.
If you add additional cores or upgrade the CPU, it just increases the priority/share of CPU time that particular VM gets.

Think of it as a group of people sharing a Playstation.
A higher CPU spec/number of cores assigned basically means you get more goes on the game than someone with a lower spec CPU/number of cores.

apologies if I've misunderstood, but it's not entirely clear what you want to know.

Disclaimer: I'm aware this is a huge oversimplification and its much more complicated than that. Many other experts are likely to pick several valid holes in this analogy...
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by:bmclamb
ID: 39600928
Thank you totallytonto.  I just want to make sure I do not over-allocate my VM's when planning how many VM's I can have given the resources and cause performance issues.
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Steve earned 235 total points
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at minimum you should allow sufficient disk/cpu/memory for all critical VMs to use their resources heavily at once, assuming you assign priorities to the VMs.

The less critical VMs can be provisioned to allow them to function but shouldn't be expected to be too harsh on their resources.
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