Overcommitment of memory in production - it would be appropriate in this case?

Hi people,

I was given a specification for a number of virtual machines by architect application a few months back.

2 x Red Hat 6, 64 GB of memory, 4 CPU

2 x Red Hat 6, 32 GB memory, 4 CPU

These VM used about 75% of my cluster resources total. I followed these virtual machines, and it has been proven that these machines have been singularly most spec'd. In reality, the memory usage is not more than 1% of the amount awarded. For one of my hosts in the cluster, I can see active 1.5 GB on 26.5 consumed Go. Despite my protests and sending on a steady stream of performance statistics, I have had these machines resized.

I am aware that VMware do not advise the use of excessive pressure in a production environment. However, I intend to approve the memory on my cluster (ESXi 4.1 vSphere) to make the most of the lost memory.

So I wanted to run it past you guys to see if I could make any false assumptions on VMWare memory management. Are there certain conditions (like mine) approve what memory should be?

One last piece of information, for the moment none of the 4 systems have install the driver of the ball and yet, the VMWare tools have been installed without it. However, I convinced the admins to install the balloon pilot sending them information how the balloon pilot prevents the host swap which itself may impact system performance.

Thank you

Mick

I agree with David and would like to share an interesting opportunity: once the balloon driver is installed in these virtual machines, you will be able to force balooning over them by setting a limit of RAM resource that is less than the amount of RAM configured. This means for example you can restrict the VM 32 GB to 24 GB (or even less), and the balloon pilot will fly the surplus of 8 GB and put it back in ESXi.

Of course in production, you should use this method only as a last resort, but there is a chance that the VM admins who will never even notice. In the past, I tried that with some strongly oversized Windows/Exchange test servers that were in State, and the admins were not aware of a problem until one day that they really started to use the system...

-Andreas

Tags: VMware

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