SAP knows that determining the resources required by an application is of paramount importance to our customers. The process of translating business requirements into hardware requirements is called hardware sizing. The size of the hardware and database is influenced by both business aspects and technological aspects. This means that the number of users using the various application components and the data load they put on the network must be taken into account.
SAP, in cooperation with its technology partners, makes sure that there is a proper sizing procedure for all applications. For sizing, the key performance indicators are CPU, disk space and disk I/O, memory, and network bandwidth. SAP also provides the tools that can help determine these key performance indicators.
Hardware sizing is very important for customers who haven't yet implemented an SAP application. In many cases, a first hardware sizing estimation can be done a year and a half prior to the planned go-live date – and often there is almost no data or only a small amount of business data available. Even with very little data, SAP can still provide tools and approaches for a first sizing estimate.
A first sizing is called hardware budget sizing, and its sole purpose is to determine if a high-end enterprise server and architecture is needed or just medium or low-end hardware. Once more information on the number and activity of expected users, as well as information on expected throughput is available, a more advanced sizing can be conducted. It's important that sizing is not considered as a one-time event; it's an iterative process that will be repeated several times.
SAP provides a wide range of tools and methodologies how these hardware requirements can be determined. The most prominent tool is the "Quick Sizer." It's an online questionnaire that is available on the SAP Service Marketplace, and can be used to calculate your hardware requirements. In order to get a reliable sizing result, it is important to feed in as many verified data as possible into the quick sizer by way of documenting the business assumptions. The result of the quick sizer is represented in categories such as CPU, memory, and disk.
With the help of SAP Standard Application Benchmarks results, statements can be made as to CPU and memory consumption of particular software components. Usually, hardware vendors are involved in sizing projects from the very beginning on.