fartman
Contributor
Contributor

Creating VM with resources bigger than physical server

Hi would like to know the impact if i create a VM with resources bigger than my physical server; if i create a vm with 64vcpu and 64GB ram but my physical ESX server only has 32 cores and 32GB ram; what would be the impact on this VM in terms of performance

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7 Replies
tedg_vCrumbs
Enthusiast
Enthusiast

Have you tried it?

You can not add more vCPU than logical cores.

You can't fit a 200lb man in 100lb pants.

------ tedg Don't forget to mark posts as helpful or correct if they deserve it!
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schepp
Leadership
Leadership

You can only create as many vCPU as you have logical cores available.

Overcommitting memory in general is possible, 100% is not a good idea though, as it will lead to heavy swapping and a terrible performance.

Tim

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fartman
Contributor
Contributor

Thanks for the info but does the same behaviour exist in VCloud director environment since in Vcloud director the resources presented are in resource pools which the total resource could be more than a single physical server

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tedg_vCrumbs
Enthusiast
Enthusiast

No it does not work in vCD either.

You will also be bound to your organizational resource entitlements.

------ tedg Don't forget to mark posts as helpful or correct if they deserve it!
RMahon1990
Enthusiast
Enthusiast

Looks like you want to power a whole country Smiley Happy

Anything over 16gb ram is just too much for any type of server.

Rob

.

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AnthonyM
Enthusiast
Enthusiast

You haven't met our HR system Smiley Wink

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fartman
Contributor
Contributor

hmm looks like i am basically bounded by the restain of the physical servers in any case