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1

SLA-based job submission and scheduling with the Globus Toolkit 4

Tenschert A., Kubert R.

Computer Science

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2012

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Vol. 13 (4)

183-204

EN

High performance computing is nowadays mostly performed in a best effort fashion. This is surprising as the closely related topic of grid computing, which deals with the federation of resources from multiple domains in order to support large jobs, and cloud computing, which promises seemingly infinite amounts of compute and storage, both offer quality of service (QoS), albeit in different ways. Long-term service level agreements (SLAs), which require the establishment of SLAs long in advance of their actual usage, seem a promising way for the offering of QoS guarantees in an HPC environment in a way that is not disruptive to the business models employed today. This work uses the long-term SLA approach as a basis for the provisioning of service levels for HPC resources and presents an SLA management framework to support this. Flexibility is provided by providing SLAs with different service levels, support for which is integrated into job submission and scheduling. The SLA management framework can, on a high level, be used in a generic fashion and an implementation is presented that is evaluated against a motivating scenario.

2

Management methods in SLA-aware distributed storage systems

Nikolow D., Słota R., Lakovic D., Winiarczyk P., Pogoda M., Kitowski J.

Computer Science

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2012

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Vol. 13 (3)

35-44

EN

Traditional data storage systems provide access to user’s data on the "best effort" basis. While this paradigm is sufficient in many use cases it becomes an obstacle for applications with Quality of Service (QoS) constraints. Service Level Agreement (SLA) is a part of the contract agreed between the service provider and the client and contains a set of well defined QoS requirements regarding the provided service and the penalties applied in case of violations. In the paper we propose a set of SLA parameters and QoS metrics relevant to data storage processes and the management methods necessary for avoiding SLA violations. A key assumption in the proposed approach is that the underlying distributed storage system does not provide functionality for resource or bandwidth reservation for a given client request.

3

Redagowanie porozumień dotyczących jakości obsługi w sieci WiMAX

Jajszczyk A., Trzmiel M.

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2009

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nr 5

176-180

PL

Przedstawiono ideę porozumień w sprawie jakości obsługi oraz QoS. Omówiono różne podejścia do redagowania kontraktów SLA występujące w literaturze fachowej. Zaprezentowane koncepcje ułożono w zestaw reguł stanowiących instrukcję tworzenia kontraktów SLA. Ostatnią część artykułu stanowi przykad tekstu porozumienia w przypadku systemu telekomunikacyjnego opartego na technice WiMAX.

EN

The concept of service level agreements and quality of service is introduced in the paper. Different methodologies and approaches to edit Service Level Agreements, extracted from the technical literature, are presented in the paper. The presented concepts are composed in a set of rules that provide a complete instruction for defining service level agreements. The paper includes a complete text of a Service Level Agreement for a WiMAX telecommunication system.

4

A Service Level Agreement Management Architecture to Improve an Information System, Business Processes Administration and Evolution

Mathieu H., Biennier F.

Schedae Informaticae

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2007

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Vol. 16

69-86

EN

Due to economic constraints, organisations are more and more distributed involving a costly communication and information system infrastructure. This involves setting tools to evaluate and improve the quality of service concerning the enterprise’s operation. This can be achieved thanks to a service contract network, (or a service level agreement network): each contract controls a part of the information system and evaluates quality of service and performance indicators. We exploit then a management tool based on mobile agents to collect and evaluate the indicators defined in the SLA network, thus enabling to control the global Information System quality of service. At last, we show on a practical case study how simple indicators can be used to detect technical breakdowns so that new parameters can be set to get back normal functioning, and thus to maintain a good quality of service.