vCPU County

Hi all

I know that the topic of vCPUs was discussed many times, but I wanted to share with you my frustrations of the job.

A few months ago, I started a new job. Ratio of virtualization is about 92%, storage is Symmetrix VMAX, PR, etc..

A co-worker made recently a few dozen VMs (I was not involved in this exercise), and that's what I discovered.

All virtual machines have been deployed with the number of virtual sockets rather than number of cores. In addition, the number of sockets is 24. Please see the attached file.

This server is not yet operational and esxtop CPU stats I see CPU READY around 8 to 10%. I wonder when applications are installed on it so that this figure will be much higher.

Anyway. I tried to explain to a teacher who has deployed virtual machines that we should start with as little as possible CPU and increase the number as a result. The answer was that it does not matter whether a plug or an assigned core.

Because of this slight misconfig we have, we had another problem. The professor even tried to deploy the couple of more virtual machines, but it failed with the resources ineffective cluster... error message.

A quick powercli revealed that 30 odd VMs have been assigned 166 vCPUs and are an another VM 60 sitting in the cluster. We have therefore oversubscribed (CPU resources) by 3 times.

Could you tell me who is right, please? I have small approach departure and the increase according to the needs, or the teacher assigning 24 virtual Sockets?

In addition, is the message HA/DRS, we have due to the fact above? I.e. misconfig CPU?

Thank you so much.

As a general rule, start low and increase. However, it actually depends on the requirements of VMs how little start.

BTW. It's okay if you configure a number of vCPUs with a unique single vCore or vCPU with a number of vCores. In the end, the virtual machine requires the same number of material resources. The difference is only how the vCPUs are presented to the guest OS.

André

Tags: VMware

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