SLA@SOI and RESERVOIR have been actively collaborating together with the aim of investigating and pursuing the integration of their respective technologies as part of the NEXOF Reference Architecture initiative. One of the outputs of this work has been a technical report that details how cloud standards, such as OCCI, can be [...]
As part of a Service Level Agreement (SLA), a service provider and its customer agree on non-functional or Quality of Service (QoS) requirements, which may be part of the pricing model. Predicting service quality attributes before service run-time helps to specify feasible SLA parameters and to consolidate efficient resource utilization with guarantees on QoS metrics.
Design-time [...]
Over the last few years, several approaches have been developed to support the monitoring of SLAs. Typically, these approaches collect events during service executions and use them to check whether the properties of service provision as specified in an SLA are satisfied. Such approaches provide state of the art mechanisms for performing the basic checks [...]
In recent years, significant advances have been made in SLA management. This progress has largely focused on the building pieces necessary to create the communications, interactions and corresponding flows required for SLA management. However, to be truly useful, support for the business aspects and terms required in the real business world also need to be [...]
Service-Oriented Architecture (SOA) represents an architectural shift for building business applications based on loosely coupled services. In a multi-layered SOA environment the exact conditions under which services are to be delivered can be formally specified by Service Level Agreements (SLAs). However, typical SLAs are just specified at the top-level and do not allow service providers [...]
Well, Hui Li from SAP has been busy and successful on his work within SLA@SOI! Along with his co-authors they have had the following papers successfully accepted:
Hui Li, Giuliano Casale, Tariq Ellahi. SLA-Driven Planning and Optimization of Enterprise Applications. 1st joint ACM WOSP/SIPEW Intl. Conference on Performance Engineering, San Jose, CA USA, Jan 2010. With [...]
The financial sector depends heavily on process and data intensive computations to deliver competitive advantage. Financial applications are particularly suited to grid-based experimentation and research. A Financial Live Trading System is used an exemplar in this article. The emerging growth of worldwide trading and the reliance on automated processing has increased the complexity and volatility [...]
Originally, (Web) services were deployed and used with almost no actual control by the different parties. The simplistic assumption that their behavior was correct and everyone had to be happy with the functionality provided was unrealistic. The actual exploitation of services, imposed us to start conceiving different methods and tools to manage the complete life-cycle of deployed and running services with special emphasis on the actual run-time behavior.
An essential part of an SLA-aware infrastructure is a scalable and self-sufficient monitoring system capable of monitoring large distributed systems, in real-time. The monitoring system must support two mutually exclusive perspectives arising from the Service Level Agreement, namely the customer’s perspective and the infrastructure/service provider’s perspective. The former is interested in the SLA alone, while [...]
INGRID 2009 took place from the 1st to the 3rd of April 2009 in in Alghero, Sardinia, Italy, and SLA@SOI was invited to participate in the session on “Enabling Quality of Service through Service Level Agreements“.
SLA@SOI, represented by Dortmund University of Technology, gave two presentations during this session. Philipp Wieder covered “Essential Concepts of Electronic [...]
