Sizing means determining hardware requirements such as memory, CPU power, disk space, I/O capacity, and network bandwidth. It is an iterative process to translate business requirements into hardware requirements, and is usually performed early in the project.
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.
With the help of SAP Standard Application Benchmark results at www.sap.com/benchmark, statements can be made as to CPU consumption and memory consumption of particular software components.
For sizing we have identified three different and independent sizing models. The first two, user-based sizing and throughput-based sizing, have been implemented in the Quick Sizer.
We defined three types of active users who work with the system to a different degree. Merely counting the users can be done quite easily. The estimation is quite rough as it says very little about the actual throughput these users produce.
This model is quite thorough because it relies on actual or on actually expected throughput. Assumptions in business terms (e.g. number of order line items per year) need to be cross-checked against the individual installation.
Customer Performance Test
The according tests are done in a customer system with customer data. The disadvantage is that conducting these tests requires considerable time and money. For further information please refer to the white paper Carrying Out Customer Performance Tests.
If you are building an SAP system from scratch, use the Quick Sizer tool or apply the relevant sizing guidelines for your SAP product.
If you have an SAP system running that you want to extend with new functionality and/or add new users or migrate to SAP HANA perform brownfield sizing.
If you are working in a large company with complex business structures, and/or custom coding, perform expert sizing.
Quick Sizer is a web-based tool designed to make the sizing of SAP Applications easier and faster. It has been developed by SAP in close cooperation with all platform partners and is free of cost.
With Quick Sizer you can translate business requirements into technical requirements. Simply fill in the online questionnaire, an up-to-date survey that is based on business-oriented figures. The results you obtain can help you select an economically balanced system that matches your company's business goals. This is especially useful for initial budget planning.
Please have a look at this short video to get an idea how Quick Sizer works.
There are three flavors of Quick Sizer available. If you are unsure which one to use, please have a look at the description below and this blog post.
HANA-based Quick Sizer
Please use this version, if the product that you want to size uses SAP HANA as database, e.g. SAP S/4HANA, SAP BW/4HANA, etc. In addition, the HANA-based Quick Sizer can be used to conduct a sizing for the SAP S/4HANA Cloud, private edition, which is part of RISE with SAP.
Non-HANA-based Classic Quick Sizer
Please use this version, if the product that you want to size shall run on a non-HANA database.
You can find in the sizing decision tree more information about the right usage of the different sizing methods and tools. If you want to conduct a HANA sizing and you are not sure which tool to use or which SAP note to apply, it’s highly recommended to have a look at this document.
In addition, please have a look at this blog entry which shows the different methods to size SAP S/4HANA; e.g. you will find more information how to use the HANA-based Cloud Quick Sizer for the S/4HANA public cloud.