Abstract
“The electricity has to be of good quality” – in the early days of electrification when customers didn’t have experience with this new technology the city council of a German village wrote this sentence in the contract with a utility company. This is quite similar to the definitions in many service level agreements for SAP solutions on public and private clouds.
This chapter discusses the definition of appropriate service levels for SAP systems in cloud environments. It focuses on the question how to predict the necessary resources to fulfill the SLA and how to measure and bill their actual consumption. Topics such as service guarantees for SAP systems and availability as well as an innovative billing tool are described in detail.
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Notes
- 1.
The way utilize excess compute power during times of low demand is to “store the request” instead of the power. This is nothing but batch processing.
- 2.
Developed by the British government, now under support of the IT Service Management Forum (http://www.itsmf.com).
- 3.
Missbach, Stelzel, SAP System Operations, SAP PRESS 2004.
- 4.
The time displayed in the DIALOG field of the CCMS also includes the runtimes on the network up to the SAP GUI. The CCMS transaction DINOGUI display the execution time of the dialog step on the servers.
- 5.
See Queuing Networks and Markov Chains. Modeling and Performance Evaluation with Computer Science Applications (Wiley 1998).
- 6.
To use the Quicksizer you need a SAP S-user account and credentials.
- 7.
Actually the numbers are calculated from the numbers of dialog steps measured and are therefore a kind of hypothetical equivalent to a standard user. Depending on the number of dialog steps per week the users (identified by their user name) are sorted into categories according to:
low < 400 dialog steps per week
medium < between 400 and 4,800 dialog steps per week
high > 4,800 dialog steps per week
The number of “Active Users” in table “Performance Indicators” is only the sum of the high and medium users. “Low Users” are neglected. If the number of Low Users is very high compared to Medium and High Users, 10 Low Users will be counted as 1 Medium User.
- 8.
It is always astonishing that customers do not remember the SAPS ratings of the servers they bought a few years ago taking into account all the battles between the different vendors about this topic. Maybe it’s a good idea to write the SAPS rating to the housing of a server directly after installation. At least you should file it in the inventory.
- 9.
Christian Bornholdt (2006) automated report generating tool for hardware resources in SAP server landscapes. Andreas Nisch (2007) Web Service zur Abrechnung der Ressourcenverbräuche von SAP-Systemen. Markus Bukaowski (2008) Tool zur automatischen Messung des Ressourcenverbrauchs von SAP.
- 10.
Analyse des Ressourcenverbrauchs in virtualisierten Systemen am Beispiel der E/A-Last betriebswirtschaftlicher Standardanwendungen. Robert Wierschke, Masterarbeit Hasso am Plattner Institut Potsdam, 2009.
- 11.
Analyse des aktuellen Ressourcenverbrauchs in konsolidierten Umgebungen am Beispiel betriebswirtschaftlicher Standardsoftwaresysteme. Daniel Richter, Masterarbeit am Hasso Plattner Institut Potsdam, 2009.
- 12.
Michael Mißbach, Uwe Hoffmann, Prentice Hall 2001, ISBN 0-13-028084-4.
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Missbach, M., Stelzel, J., Gardiner, C., Anderson, G., Tempes, M. (2013). Service Levels for SAP on Cloud. In: SAP on the Cloud. Management for Professionals. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-31211-3_3
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DOI: https://doi.org/10.1007/978-3-642-31211-3_3
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