A System Dynamics Approach to Web Service Capacity Management

Abstract

Abstract-This paper presents a dynamic simulation model applied within the field of web services capacity management. The main purpose of the model is to help manage the web services capacity that providers assign their customers accordingly so as to ensure the fulfillment of the Service Level Agreements (SLAs) established.Therefore, the model allows for the analysis of the effects of different web services capacity management polices on the service performance and on the penalties to be assumed by providers for non-compliance with the response times agreed with their customers. The main aims of the sensitivity analysis carried out in the case study of this research paper are as follows: (1) to assess the fulfillment of the SLAs according to the web service capacity contracted by the customer, (2) to determine the lowest web service capacity and those capacity management parameters that ensure that the actual service performance is the one that has been agreed on (3) to evaluate the penalties that the web service provider should assume for non-compliance with response times.

Using simulation to aid decision making in managing the usability evaluation process

“…Among current trends, we can find the application of simulation and modelling to various activities such as software development with agile methodologies [48], global software development [49] and IT service management processes [50], [51].…”

Building Dynamic Models of Service Compositions with Simulation of Provision Resources

“…The former has been studied in several interesting, but specific, cases [9,10], and some examples of a more systematic approaches to building such dynamic composition models based on QoS constraints have been demonstrated [11]. Our intention is to propose a generic method of converting descriptions of orchestrations in the form of a place-transition networks (PT-nets) [12] into dynamic models, in a manner that ensures composability of orchestrations within choreographies.…”

WSARCH: Uma arquitetura para a provisão de web services com qualidade de serviço

“…Em (Orta et al, 2009) é apresentado um modelo de simulação relacionado ao gerenciamento de capacidade de Web Services. A principal finalidade do modelo é ajudar a gerir a capacidade de Web Services atribuídas pelos provedores de serviços aos seus clientes com o objetivo de assegurar o cumprimento de um acordo de nível de serviço (SLA -Service Level Agreements).…”

“…O gerenciamento de QoS tem sido extensivamente estudado em aplicações multimídia baseada na rede, bem como baseada em aplicações Web. No contexto de Web Services (Papazoglou et al, 2007), (Orta et al, 2009), (Liang et al, 2009), as pesquisas estão em constante evolução.…”