40 vcpu VM hardware requirements?
Hi all
Running a 15-node cluster with 2 core socket/6 blade servers. I had a request for a 40 VM vCPU. I'm having a brain Peter here. The physical servers have more than 40 hearts to run this? I always thought as the root of the list of resources to share the CPU in the cluster to give the VM vCPU 40 but my colleague thinks otherwise.
We run ESXi 5.1 Enterprise Plus.
A VM is only running on a single physical host at any given time. In other words, only a single virtual machine can use the resources provided by a single host. As a vCPU maps to a thread of a physical CPU, it makes no sense at all to provide a virtual machine with more than 24 vCPUs in your environment (2 x 6 cores + HT which should have enabled). I also think that you can even create a VM with vCPUs more than you have physical threads available in your single host.
Demand for vCPU 40 seems clearly oversized and not aware of the infrastructure. I hope that they have an extremely solid and objective explanation to do this, I guess they don't have any.
Hell, even a recent physical Intel 2 sockets, 8 cores + powerful server HT cannot provide much more CPU resources.
Tags: VMware
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