Service level objective

About: Service level objective is a research topic. Over the lifetime, 7894 publications have been published within this topic receiving 218701 citations.

Automated and Adaptive Threshold Setting: Enabling Technology for Autonomy and Self-Management

Abstract: Threshold violations reported for system components signal undesirable conditions in the system. In complex computer systems, characterized by dynamically changing workload patterns and evolving business goals, the pre-computed performance thresholds on the operational values of performance metrics of individual system components are not available. This paper focuses on a fundamental enabling technology for performance management: automatic computation and adaptation of statistically meaningful performance thresholds for system components. We formally define the problem of adaptive threshold setting with controllable accuracy of the thresholds and propose a novel algorithm for solving it. Given a set of Service Level Objectives (SLOs) of the applications executing in the system, our algorithm continually adapts the per-component performance thresholds to the observed SLO violations. The purpose of this continual threshold adaptation is to control the average amounts of false positive and false negative alarms to improve the efficacy of the threshold-based management. We implemented the proposed algorithm and applied it to a relatively simple, albeit non-trivial, storage system. In our experiments we achieved a positive predictive value of 92% and a negative predictive value of 93% for component level performance thresholds

Evaluating the customer perceptions on in-flight service quality

Abstract: In the competitive aviation market as a result of the emergence of charter airlines have had to reconsider their in-flight services approach to service provision. Specifically, the in-flight comfort offered based on the service quality perception. However, in-flight service quality is always vague and hard to express in exact number. Therefore, this study applies fuzzy-grey method based to deal with the vagueness and uncertainty. The objective of this study aims to deal with domestic airline in-flight service quality with uncertainty. The study is a key strategic direction of domestic airlines in Taiwan. In general, these considering criteria are self-structured. The results are as follows, (i) the weights of criteria and alternatives are described in linguistic preferences; (ii) using a grey possibility degree to result the ranking order for all alternatives; (iii) an empirical example of in-flight service quality ranking problem in customer perspective. Key words: Grey theory, triangular fuzzy numbers, in-flight service quality, linguistic preferences.

Dynamic and automatic colocation and combining of service providers and service clients in a grid of resources

Abstract: A method for providing a servicing operation in a computing environment includes providing a plurality of resources including at least a client resource requiring a periodic servicing operation, a service provider resource capable of providing that servicing operation. At least one of the client resource and the service provider resource are defined by virtual machines. The client resource and the service provider resource are transparently co-located by transferring the resource defined by a virtual machine, and the service provider resource performs the servicing operation. Methods, computer systems, and computer programs available as a download or on a computer-readable medium for installation according to the invention are provided.