To support the service offerings, determining the infrastructure’s capacity and scalability is important. The following model examples determine how the resources are allocated:

To determine the appropriate standard units of resource consumption, the VMware Powered Public Cloud service provider can analyze current environment usage, user demand, trends, and business requirements. Use this information to determine an appropriate capacity distribution that meets business requirements. If this information is not readily available, predicting the infrastructure capacity can be difficult because it depends on the expected customer uptake and usage of the workloads.

However, understanding the infrastructure capacity required, based on an estimate of the different allocation models and capacity distribution of the workloads, is useful. The capacity distribution and resulting infrastructure resources allocated can be adjusted based on utilization and demand. VMware vRealize Operations can help the cloud provider’s operations teams accurately forecast capacity usage and trends.

The example in the following table distributes capacity based on 50 percent of the virtual machines for the dedicated allocation model and 50 percent of the virtual machines for the on-demand model. The reservation pool model is applied to small, medium, and large pools, with a respective split of 75 percent, 20 percent, and 5 percent.

 

Therefore, small represents 37.5 percent of the total, medium represents 10 percent of the total, and large represents 2.5 percent of the total number of virtual machines in the environment. 
The table lists the virtual machine count for the various resource pools supporting the two example allocation models for the virtual data centers.

 

The following virtual machine distribution is used in the service capacity-planning example:

The following table lists some examples of workload virtual machine sizing and utilization.