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vmlearner991
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Intel® Xeon® Gold 5120T Processor 14C, 128GB Ram, if VM 2 vcpu 2 gb ram, what is the max vm able to create ?

Hello,

Intel® Xeon® Gold 5120T Processor 14C, 128GB Ram, if VM 2 vcpu 2 gb ram, what is the max vm able to create ?

Thanks !!

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scott28tt
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Your performance MIGHT be poor it MIGHT be fine, it depends mostly on what resources the VM demand compared to what resources are physically available.

If you have a 16 core CPU and run 80 VMs with 1 vCPU each, you are at a 5:1 ratio of vCPUs to cores - if the CPU demand of the VMs is low it might all work to an acceptable level of performance.

Think more in terms of MHz/GHz of demand (from the VMs) and supply (from the host).


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scott28tt
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On ESXi, it doesn’t really work like that because you can overcommit compute resources.

So, you might deploy 20 VMs with that spec and everything runs just fine even though you have 40 vCPUs, or performance might be poor. This principle is the same with memory.

Think about the work that those VMs would be doing, rather than just the compute spec.


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Although I am a VMware employee I contribute to VMware Communities voluntarily (ie. not in any official capacity)
VMware Training & Certification blog
vmlearner991
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Hi scott28tt,

Appreciate your replied.

We're new in VM ESXI, that's why we're assume how much vm that we're able to run, so which mean i can run 1 vcpu with 1 gb ram with 80 vms, but get pool performance, and i right?

We're confused we need more ram or need more core, please advise , thanks !

Thanks again !

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scott28tt
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Your performance MIGHT be poor it MIGHT be fine, it depends mostly on what resources the VM demand compared to what resources are physically available.

If you have a 16 core CPU and run 80 VMs with 1 vCPU each, you are at a 5:1 ratio of vCPUs to cores - if the CPU demand of the VMs is low it might all work to an acceptable level of performance.

Think more in terms of MHz/GHz of demand (from the VMs) and supply (from the host).


-------------------------------------------------------------------------------------------------------------------------------------------------------------

Although I am a VMware employee I contribute to VMware Communities voluntarily (ie. not in any official capacity)
VMware Training & Certification blog
vmlearner991
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Hi scott28tt,

Thank you for your fast response.

Last question, if we have more and more ram, such as 14 core with 256gb ram, is this help to stable or get more vms ?

Thank you.

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IRIX201110141
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No because your Host have CPU constraints.

To make it clear...

If the GuestOS place a single tiny process/thread on every of the 2 vCPU the ESXi hosts need to allocate 2 cores. This mean that 8 of your 80 VMs get cpu ressource for around 20ms. The other 72 have to wait.

I would like to see CPU Ready stats and Co-Stop of your tiny 14c Host with 80 running VMs.

Regards,
Joerg

vmlearner991
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Hi Joerg,

Thank you for your replied.

We're currently setup in progress, we have no idea how many vms we are able to setup in this server.

The purpose of using this server is , we will use this server's vm connect to 20000 api, and running daily. we're no sure is that enough hardward to run this requirement.

Thank you.

Regards,

Desmond

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IRIX201110141
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Understood.

But nobody here can help you because it all depends on whats going on into the GuestOS and your special app.

The technical limits you will find under https://configmax.vmware.com/guest?vmwareproduct=vSphere&release=vSphere%206.7&categories=2-0

Regards,
Joerg

vmlearner991
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Hi Joerg,

Thank you for the information !!

Regards,

Desmond

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