Limitation of the Virtual Machine's CPU/memory resources.

Hello

My question on the tab "resources" with VMachine settings (I hope I picked the right branch here)

In this tab I put a booking/Limit for CPU/memory for current VMachine.

I have a cluster about 6 ESX servers with resource by default and a VMachine inside pool. VMachine have 1 CPU. Each ESX have 2 plugs with 4 core per socket. Each base equal to 2, 83GHz. Def.

In this case, which by default configuration for an average CPU for this VMachine limitaion - 132582 MHz? Because in practice ESX server can give only 1 CPU for this VMachine and this CPU will have 2, 83GHz only...

Also, I put 100% of CPU - 132582 MHz booking here... But in true VMachine will never receive this resource...

Same question about limitation of memory...

When this limitation will work? For what porpose such booking/limitaion here?

Re: But, if I'm going to make a mistake and this CPU for VM value reserve, which is more physical limitation - it reduces resources processor for other VMs on a value that is more than the physical limitation of the virtual computer?

No, the reservation only guarantees that if a virtual machine wants to take a large part of the resource at a given time VMware should give him.  If there is ever going to be a situation where the virtual machine is in fact to consider that much so it never gets allocated to this virtual machine and the amount of the resource remains available for other virtual machines to use.  Similarly, if the virtual machine just does not use the amount of the booking to a point in time, he let this resource can be used by other virtual machines.

If a virtual computer uses only 1 GHz on a core 3 GHz system, at a given time but thereservation is 2.5 GHz, 1.5 GHz between its use and booking that is not used at this time is available for other VMS to use.  That is only if there is a period of contention between VM and VM CPU wishing to use mean 2.8 GHz it would be guaranteed to get 2.5 GHz independently of the parameters of the actions on the VM from other virtual machines.

It is essentially the same thing with memory except that the memory usage is not as CPU flunctuate and VMware must also use more complex methods to reallocate the memory, but the leaders of the way in which it is shared using actions, reservations and limit is the same.

Tags: VMware

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