I may limit my VM1 to use only a maximum of 4 GB of physical memory and 1,000 MHz of CPU cycles. You can configure a maximum of what the VM can consume. However, it would be too complex to cover this in detail here.īe careful if you configure too many or too high reservations, you may negatively affect performance since you are limiting the ESXi resource scheduler to do its job. To be able to do this, the CPU scheduler calculates a MHzPerShare metric. On the other hand, if you set a CPU reservation for a VM and the VM is not using the CPU cycles, the CPU scheduler distributes CPU cycles to other active VMs. If you configure the reservation on a running VM, you need to reboot to reduce the swap file.
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Be aware that this only applies during the power cycle. This may be useful to save some storage space. If you set Reserve all guest memory, there will be no swap file at all. The swap file size is equal to the configured RAM deducted by the reservation size. You should also know that setting a memory reservation reduces the size of the VM swap file. The resources must be available at the time of VM power on otherwise, it will fail to start! As reservations are applied on the fly, the same requirement is valid if the VM is already running. If you need to make sure the specific VM will always have given amount of physical resources available, this is the right setting to configure. Reservations ^īy configuring reservations, you guarantee a specific amount of resources to the VM. Please remember: shares only apply when resources are under contention. Since both of my VMs have the same memory share values, they will get equal resources.
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As a result, I will have:īy changing the share settings, I have instructed the CPU scheduler to change its behavior and prioritize VM2 over VM1, which would have priority by default. As I want VM2 to have more CPU time than VM1, I need to set the VM1 shares to low.