VMware Memory and CPU考虑

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　　Memory Consideration:
A basic rule for sizing is to have between at least 4 GB and 8 GB of RAM per physical core.
　　
1. For an optimized approach, notably for test, development, and preproduction applications, follow this rule:
The sum of memory configured in VMs can be double the physical RAM in the server.

2. For a conservative approach (for sensitive applications), transpose the same amount of memory used in the physical environment to determine the amount of memory required on the ESXi server and then add 10%.

CPU Consideration:
How many VMs can there be per ESXi host server? Globally, capacity planning can be done as follows:
1. Between two and four vCPUs per core for medium loads
2. One vCPU per core for high loads

　　Example:
A server with 12 cores allows 24 to 48 vCPUs to run. This is equivalent to 24 to 48 VMs configured each with 1 vCPU for medium application loads. For high-activity applications, this represents 12 vCPUs (for instance, 12 VMs with 12 vCPUs, or 3 VMs with 4 vCPUs).