Continue with your CPU estimates to take into account other quality of service requirements that can impact load:
Security. From the technical requirements phase, determine how secure transport of data might affect the load requirements and make corresponding modifications to your estimates. The following section, Estimating Processor Requirements for Secure Transactions describes a process for making adjustments.
Replication of services. Adjust CPU estimates to account for replication of services for availability, load balancing, and scalability considerations. The following section, Determining Availability Strategies, discusses sizing for availability solutions. The section Determining Strategies for Scalability discusses solutions involving available access to directory services.
Latent capacity and scalability. Modify CPU estimates as necessary to allow latent capacity for unexpected large loads on the deployment. Look at the anticipated milestones for scaling and projected load increase over time to make sure you can reach any projected milestones to scale the system, either horizontally or vertically.