ABSTRACT The ongoing trend towards a global services economy creates considerable market opportun... more ABSTRACT The ongoing trend towards a global services economy creates considerable market opportunities for various stakeholders. A service intermediary who offers complex services to customers and consumes services from suppliers and thus creates a service value network, faces the challenge of adhering to agreed service levels while minimizing associated costs, risks and potential penalties. Starting from a lifecycle model for service value networks, this paper identifies the service level management tasks to be performed by a service intermediary. For each of these tasks, supporting software tools have been developed. Together, they form an integrated tool chain which provides effective support for service level management of service intermediaries. The tools have been evaluated in case studies and industrial settings. The paper contributes the first study of an end-to-end service level management for service value networks.
Integration of Practice-Oriented Knowledge Technology: Trends and Prospectives, 2013
... Service Level Management for Service Value Networks. In 5th International Workshop on Service... more ... Service Level Management for Service Value Networks. In 5th International Workshop on Service Science and Systems (SSS 2012) at the IEEE Conference on Computer Software and Applications (COMPSAC 2012) 13. Schulz, F. (2011). ...
6th Joint IFIP Wireless and Mobile Networking Conference (WMNC), 2013
ABSTRACT The performance of mobile applications has critical impact on their adoption and success... more ABSTRACT The performance of mobile applications has critical impact on their adoption and success. Mobile scenarios especially in enterprise context require the connectivity to backend services that are hosted in cloud environments. Performance engineering in such a setting is challenging due to the heterogeneous influencing factors, namely limited resources on the mobile device, the available mobile network, and the characteristics of the cloud backend. In order to tackle this challenge, we propose a measurement approach based on automated experiments. By collecting performance metrics from the web frontend, traffic statistics from the device, and performance data from the cloud backend, we get an end-to-end view on the overall performance. Parameterised performance experiments allow a systematic variation in the workload and application dimensions of interest. As a result, the influencing factors of mobile cloud performance can be clearly identified and quantified, and build the foundation for feedback to development and deployment, and subsequent performance improvements and predictions.
In service oriented architectures (SOA), the nonfunctional properties of services have been recog... more In service oriented architectures (SOA), the nonfunctional properties of services have been recognized to be highly important in addition to the functionality of services as a means to differentiate services according to quality considerations. Service level agreements (SLAs) are formalized contracts between service providers and service consumers that are used to define quality of service (QoS) properties. The violation of an SLA by the service provider typically results in a penalty to compensate the service consumer. In order to avoid such situations, the service provider needs to recognize critical service instances and to take appropriate countermeasures before a violation happens. Therefore a measure for quantifying the danger of SLA violation is needed as part of a service level management system. This paper proposes a concept for the definition and evaluation of such a metric that takes into account the underlying structure of the SLA as well as the available options for monitoring service quality parameters. Hence it becomes possible to obtain detailed information of the status of service fulfillment at runtime and to identify critical service instances. The methodology is exemplified with the availability property.
Elasticity has been identified as one of the key features of delivering IT services over the inte... more Elasticity has been identified as one of the key features of delivering IT services over the internet. Major definitions of cloud computing consider elasticity as an essential property of cloud services, and as one of the main reasons to use cloud infrastructures. However, customers expect and hope for the elasticity promise without having any guarantee or contractual agreement. While elasticity has mostly been considered on qualitative terms, there have been recent efforts in quantifying elasticity and thus enabling the measurement of elasticity. Based on new approaches of defining elasticity, it becomes possible to specify precise and meaningful elasticity guarantees, which is advantageous for both consumers and providers of cloud services. This work contributes to the ongoing elasticity research by including elasticity terms into service level agreements (SLAs). This is achieved by restricting the validity of service level objectives with respect to the available elasticity. The approach is explained in detail and its advantages and consequences for service providers and consumers are discussed.
ABSTRACT The ongoing trend towards a global services economy creates considerable market opportun... more ABSTRACT The ongoing trend towards a global services economy creates considerable market opportunities for various stakeholders. A service intermediary who offers complex services to customers and consumes services from suppliers and thus creates a service value network, faces the challenge of adhering to agreed service levels while minimizing associated costs, risks and potential penalties. Starting from a lifecycle model for service value networks, this paper identifies the service level management tasks to be performed by a service intermediary. For each of these tasks, supporting software tools have been developed. Together, they form an integrated tool chain which provides effective support for service level management of service intermediaries. The tools have been evaluated in case studies and industrial settings. The paper contributes the first study of an end-to-end service level management for service value networks.
... Service Level Management for Service Value Networks. In 5th International Workshop on Service... more ... Service Level Management for Service Value Networks. In 5th International Workshop on Service Science and Systems (SSS 2012) at the IEEE Conference on Computer Software and Applications (COMPSAC 2012) 13. Schulz, F. (2011). ...
ABSTRACT The ongoing trend towards a global services economy creates considerable market opportun... more ABSTRACT The ongoing trend towards a global services economy creates considerable market opportunities for various stakeholders. A service intermediary who offers complex services to customers and consumes services from suppliers and thus creates a service value network, faces the challenge of adhering to agreed service levels while minimizing associated costs, risks and potential penalties. Starting from a lifecycle model for service value networks, this paper identifies the service level management tasks to be performed by a service intermediary. For each of these tasks, supporting software tools have been developed. Together, they form an integrated tool chain which provides effective support for service level management of service intermediaries. The tools have been evaluated in case studies and industrial settings. The paper contributes the first study of an end-to-end service level management for service value networks.
Integration of Practice-Oriented Knowledge Technology: Trends and Prospectives, 2013
... Service Level Management for Service Value Networks. In 5th International Workshop on Service... more ... Service Level Management for Service Value Networks. In 5th International Workshop on Service Science and Systems (SSS 2012) at the IEEE Conference on Computer Software and Applications (COMPSAC 2012) 13. Schulz, F. (2011). ...
6th Joint IFIP Wireless and Mobile Networking Conference (WMNC), 2013
ABSTRACT The performance of mobile applications has critical impact on their adoption and success... more ABSTRACT The performance of mobile applications has critical impact on their adoption and success. Mobile scenarios especially in enterprise context require the connectivity to backend services that are hosted in cloud environments. Performance engineering in such a setting is challenging due to the heterogeneous influencing factors, namely limited resources on the mobile device, the available mobile network, and the characteristics of the cloud backend. In order to tackle this challenge, we propose a measurement approach based on automated experiments. By collecting performance metrics from the web frontend, traffic statistics from the device, and performance data from the cloud backend, we get an end-to-end view on the overall performance. Parameterised performance experiments allow a systematic variation in the workload and application dimensions of interest. As a result, the influencing factors of mobile cloud performance can be clearly identified and quantified, and build the foundation for feedback to development and deployment, and subsequent performance improvements and predictions.
In service oriented architectures (SOA), the nonfunctional properties of services have been recog... more In service oriented architectures (SOA), the nonfunctional properties of services have been recognized to be highly important in addition to the functionality of services as a means to differentiate services according to quality considerations. Service level agreements (SLAs) are formalized contracts between service providers and service consumers that are used to define quality of service (QoS) properties. The violation of an SLA by the service provider typically results in a penalty to compensate the service consumer. In order to avoid such situations, the service provider needs to recognize critical service instances and to take appropriate countermeasures before a violation happens. Therefore a measure for quantifying the danger of SLA violation is needed as part of a service level management system. This paper proposes a concept for the definition and evaluation of such a metric that takes into account the underlying structure of the SLA as well as the available options for monitoring service quality parameters. Hence it becomes possible to obtain detailed information of the status of service fulfillment at runtime and to identify critical service instances. The methodology is exemplified with the availability property.
Elasticity has been identified as one of the key features of delivering IT services over the inte... more Elasticity has been identified as one of the key features of delivering IT services over the internet. Major definitions of cloud computing consider elasticity as an essential property of cloud services, and as one of the main reasons to use cloud infrastructures. However, customers expect and hope for the elasticity promise without having any guarantee or contractual agreement. While elasticity has mostly been considered on qualitative terms, there have been recent efforts in quantifying elasticity and thus enabling the measurement of elasticity. Based on new approaches of defining elasticity, it becomes possible to specify precise and meaningful elasticity guarantees, which is advantageous for both consumers and providers of cloud services. This work contributes to the ongoing elasticity research by including elasticity terms into service level agreements (SLAs). This is achieved by restricting the validity of service level objectives with respect to the available elasticity. The approach is explained in detail and its advantages and consequences for service providers and consumers are discussed.
ABSTRACT The ongoing trend towards a global services economy creates considerable market opportun... more ABSTRACT The ongoing trend towards a global services economy creates considerable market opportunities for various stakeholders. A service intermediary who offers complex services to customers and consumes services from suppliers and thus creates a service value network, faces the challenge of adhering to agreed service levels while minimizing associated costs, risks and potential penalties. Starting from a lifecycle model for service value networks, this paper identifies the service level management tasks to be performed by a service intermediary. For each of these tasks, supporting software tools have been developed. Together, they form an integrated tool chain which provides effective support for service level management of service intermediaries. The tools have been evaluated in case studies and industrial settings. The paper contributes the first study of an end-to-end service level management for service value networks.
... Service Level Management for Service Value Networks. In 5th International Workshop on Service... more ... Service Level Management for Service Value Networks. In 5th International Workshop on Service Science and Systems (SSS 2012) at the IEEE Conference on Computer Software and Applications (COMPSAC 2012) 13. Schulz, F. (2011). ...
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Papers by Frank Schulz