Hi Folks,

Memory allocation while configuring the Hyper-V infastructure:

The physical computer that hosts the virtual machines should have available physical memory equal to the sum of the memory allocated for each virtual machine plus the following:

300 MB for the Hypervisor

32 MB for the first GB of RAM allocated to each virtual machine

8 MB for every additional GB of RAM allocated to each virtual machine

512 MB for the host operating system running on the root partition

For example, if a Hyper-V virtual machine is allocated 2 GB of memory in the Hyper-V Manager, the actual physical memory used when running that Hyper-V virtual machine would be approximately 2388MB (300MB for the hypervisor +2GB allocated for the virtual machine + 32MB + 8MB = 2388MB). Because the hypervisor only needs to be loaded once, initialization of subsequent virtual machines does not incur the 300 MB overhead associated with loading the hypervisor. Therefore, if two Hyper-V virtual machines are each allocated 2 GB of memory in the Hyper-V Manager, the actual physical memory used when running these Hyper-V virtual machines would be approximately 4476MB (300MB for the hypervisor +4GB allocated for the virtual machines + 64 MB + 16MB = 4476MB).

  As a general rule of thumb, plan to allocate at least 512 MB memory for the root partition to provide services such as I/O virtualization, snapshot files support, and child partition management.

 Use a 64-bit guest operating system when possible – Consider using a 64-bit operating system for each guest operating system. This should be done because by default, 32-bit Windows operating systems can only address up to 2GB of virtual address space per process. Installation of a 64-bit operating system allows applications to take full advantage of the memory installed on the physical computer that hosts the Hyper-V virtual machines.

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