Calculation method of server virtualization hardware configuration requirements

For example, each virtual machine requires 1 CPU, 2G memory, 100G hard disk, 100Mbps network bandwidth, and 200 virtual machines.

1. Processor: Hyper-V R2 can use up to 64 Logical Processors of the host, and one Logical Processor can support running 8 virtual processors, that is, if it is a single-core processor host with one CPU, it can run up to 8 virtual machine. Considering the performance factor in Hyper-V R2, we can run up to 384 virtual machines on a host machine (assuming that each virtual machine has only one virtual processor). For example, if we want to run 200 Win 7s on a host machine, the host machine must have at least 25 cores (25 * 8 = 200), converted to a power of 2, which is 32 cores. This is of course based on the premise that only one virtual CPU is allocated per Win 7. If each Win 7 needs 2 CPUs, then 200 * 2 = 400, it will exceed the upper limit of 384, and it will not be able to run on one host.

For example, there are 16 virtual machines to be run, and each virtual machine is assigned 2 virtual CPUs, then the total number of virtual CPUs required is 16 * 2 = 32, and at least 32/8 = 4 logical processors are required. It is a dual-core CPU, so at least two dual-core CPUs are required.

2. Processor: The larger the cache, the better, especially when the ratio between the virtual processor and the physical processor is high.

3. Memory: Host RAM = (VMRamRequirementMB x #ofVMs) + (#of VMs x 32MBVMOverhead) + (512MBHost). According to my example, the host memory = 2G * 200 + 200 * 32MB + 512MB = 406.75 GB, of course, we can do some redundancy, take 512GB (enterprise version and data center version can support up to 2TB of memory)

4. Network: If the network data transmission volume is large, you can install multiple network cards and bind multiple virtual machines to one network card. For example, each virtual machine needs 100Mbps, then the host may need 20 1000Mbps network cards, each network card is bound to 10 virtual machines.

5. Storage: It is recommended to use a fixed-size VHD file as the hard disk file of the virtual machine. It is recommended to connect a SAN as a storage resource in the background. For example, the total storage capacity needs 100G * 200.