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Sizing SAP Systems
Whether you're a new SAP customer who needs to forecast your IT hardware budget, or an existing SAP customer who wants to find out if your current hardware will be able to support a new release - your evaluation must be based on a reliable hardware sizing process.
This technical guide provides system administrators, technical project managers,
and consultants with comprehensive answers to all of the most pressing questions related to sizing: How can I set up a sizing project? How do I obtain the necessary data? How can I validate a sizing process? How do I interpret the results of my sizing project? This book describes different methods and utilities that are available to determine the values you need and in doing so provides the basic information you need in order to efficiently use SAP's Quick Sizer in your initial sizing process, obtain satisfactory results, and to interpret these results in a useful manner. Using standard tools alone, however, doesn't always produce good sizing results. It is the underlying data that matters. To this end, you'll also uncover the methods that enable you to verify sizing results.
Since the goals of sizing projects can be very different, the book contains numerous real-life examples that demonstrate the different methods and possible project situations. Volumes of step-by-step descriptions related to the Quick Sizer and other tools, sample calculations, and best practices for project planning make this exclusive guide an indispensable companion for your sizing projects.
1. Introduction ... 3
2. Sizing Methods ... 7
... 2.1 Phases of Sizing Projects ... 7
... 2.2 Methods for Initial Sizings ... 8
... 2.3 Sizings Based on Productive Customer Data ... 12
... 2.4 Summary ... 15
3. Sizing Approaches ... 17
... 3.1 Factors That Influence Sizing ... 17
... 3.2 Key Performance Indicators ... 18
... 3.3 Overview of Different Sizing Approaches ... 20
... 3.4 User and Throughput Sizing Models ... 24
... 3.5 Conclusion ... 27
4. Sizing Tools ... 29
... 4.1 Rule of Thumb/Reality Check ... 29
... 4.2 T-shirt Sizing ... 30
... 4.3 Sizing Formula ... 32
... 4.4 Offline Questionnaire ... 33
... 4.5 Summary ... 33
5. Quick Sizer ... 35
... 5.1 Quick Sizer Projects ... 36
... 5.2 Functions ... 40
... 5.3 Average and Peak Sizing ... 48
... 5.4 Summary ... 50
6. Performance Monitors and Traces ... 51
... 6.1 Operating System Monitor ... 52
... 6.2 Database Monitor ... 53
... 6.3 Application Monitor ... 54
... 6.4 Single Record Statistics ... 56
... 6.5 Performance Trace ... 57
... 6.6 Summary ... 58
7. Sizing Verifi cation ... 59
... 7.1 Load Tests ... 59
... 7.2 Verification via Support Services ... 63
... 7.3 Summary ... 69
8. Executing Sizing Projects ... 71
... 8.1 Before the Sizing Project Begins ... 71
... 8.2 Project Team ... 73
... 8.3 Methodical Procedure ... 74
... 8.4 Summary ... 78
9. Sizing Details ... 79
... 9.1 Basic Foundations of the SAP Sizing Model ... 79
... 9.2 SAP Application Performance Standard ... 92
... 9.3 Performing Sizing Measurements ... 94
... 9.4 Summary ... 99
10. Summary and Outlook ... 101
A. Frequently Asked Questions ... 103
... A.1 Sizing Approaches ... 103
... A.2 Quick Sizer ... 104
... A.3 Sizing Projects ... 104
B. Literature and Links ... 105
Index ... 107
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