Dynamic memory settings for Hyper-v

To use dynamic memory, you select the enable Dynamic Memory check box on the Memory page of the Settings dialog box, or When creating a virtual machine, Select use the dynamic memory for this virtual machine check box on the Assign Memory page.

Then, you configure the following memory settings:

RAM：The value of memory when the virtual machine starts

Minimum RAM：Specifies the minimum amount of memory that should be allocated to the virtual machine after the virtual machine has started. The default setting is 512 MB.

Maximum RAM：Specifies the maximum amount of memory that this virtual machine is allowed to use. The value can be set from as low as the value for Startup RAM to as high as 1 TB.

Memory buffer：Specifies the percentage of the currently allocated memory that dynamic memory should retain as a buffer for future expansion. For example, if the memory committed to the guest operating system is 1000 MB and the memory buffer is 20%, Hyper-V will attempt to allocate an additional 20% (200 MB) for a total of 1200 MB of physical memory allocated to the virtual machine.

Amount of memory buffer=how much memory the virtual machine actually needs / (memory buffer value / 100).

Note：The buffer is not maintained when there is not enough physical memory available in the computer to give every virtual machine its requested memory buffer.

Memory weight：Provides Hyper-V with a way to determine how to distribute memory among virtual machines if there is not enough physical memory available in the computer to give every virtual machine its requested amount of memory.

Dynamic Memory Limitations:

You cannot enable or disable dynamic memory when the VM is running.

You cannot modify the RAM setting when dynamic memory is enabled.

You can reduce, but not increase, the Minimum RAM setting when the VM is running.

You can increase, but not reduce, the Maximum RAM setting when the VM is running.