Reference VM size is the size of the VM used by SHO to express the remaining capacity of one or more VM hosts in terms of number of VMs.
You can define the CPU capacity (CPU cycles), memory capacity (GB), and vDisk capacity (GB) for four VM sizes, namely, Small, Medium, Large, and Custom. For more information on defining the reference VM size, see Defining Reference VMs and Hosts.
SHO provides 6 options to define the reference VM size:
Weighted Average of Small, Medium, and Large: This reference VM size is the weighted average of the Small, Medium, and Large VM sizes that you define. The calculation is as follows:
Reference VM CPU size (in GHz) = ((Number of Small VMs * CPU size of Small VM) + (Number of Medium VMs * CPU size of Medium VM) + (Number of Large VMs * CPU size of Large VM)) / Total number of VMs in your data center
The reference size for memory and vDisks is calculated using similar algorithm.
Note: The default value for reference VM size is Small.