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Motivated by the high complexity of today’s datacenters, a large body of studies tries to understand workloads and resource utilization in datacenters. However, there is little work on exploring unsuccessful job and task executions. In this article, we study and predict three types of unsuccessful executions in traces of a Google datacenter, namely $\sf {fail}$<alternatives> <inline-graphic xlink:href="rosa-ieq1-2543718.gif"/></alternatives>...
The need for performance has motivated the increasing adoption of solid-state drives (SSD) both in personal computers and data centers. However, the high cost per gigabyte and reduced lifetime hinder the thorough replacement of hard disk drives (HDD) with SSDs. To mitigate these issues, several architectures have been conceived based on hybrid storage systems, but performance and dependability models...
The expanding applications of cloud computing has urged the researchers with strong requirements for developing trust management models. It is essential to create trust management system that is adoptable for improving the privacy of the consumers, enabling the service availability, providing security to both cloud service providers and consumers of cloud services. Due to the dynamic cloud environment...
Cloud computing brings new technologies and concepts that favor communication services and data storage. Services like OneDrive, Google Drive and DropBox increase data availability and provide new features as synchronization and collaboration. This article aims to assess the availability and performance of private cloud storage service. A set of models that use a hierarchical strategy is proposed...
This work focuses on a health-aware Model Predictive Control (MPC) scheme, which aims at enhancing the availability of the system. The objective is to extend the uptime of the system by delaying, as much as possible the system reliability decay. The weights of the MPC cost function are set according to some reliability importance measures. This work describes the main reliability importance measures...
According to the development status of reconfigurable computing specially its applications and advantages in the domain of aviation and spaceflight, this paper makes a research in the availability of reconfigurable computing. Through three aspects, reconfigurable chip, development tool and compilation technology, this paper analyses the obstacles reconfigurable computing faced with. In the end, this...
This paper presents a mathematical model based on continuous time Markov chain for performing availability and reliability analysis of a repairable system consisting of n components. It also describes a methodology for identifying a critical component based on continuous-time Markov chain state probabilities of an n-component repairable and non-repairable system. As an illustration, a 3-component...
The Internet is playing an increasingly crucial role in both personal and business activities. Handling link failures is an important task in designing routing protocols. To enhance the network availability without incurring significant extra overhead, we propose a novel link protection algorithm, Hybrid Link Protection Scheme (HLP) to achieve failure resilient routing.
Grid computing provides collaborative sharing of resources among the peers across the world. There are various types of resources in a grid at different capacities such as computing, storage, and instruments. Security plays a vital role in setting up a grid and to preserve its resources. Further, trust also plays a vital role in building a confidence level in sharing the resources. T-Grid is the model...
A new methodology is presented, allowing to evaluate protection systems reliability and availability indexes, taking into account equipment failure and repair rates. The protection scheme is translated into a reliability graph, enabling to identify all possible logical occurrences in the system, either meaning failure or successful operation. Evaluation of the system reliability and availability indexes...
The use of sensor networks has increased rapidly over the last years. Due to their low resources, sensors come along with new issues regarding network security and energy consumption. Focusing on the network availability, previous studies proposed to protect the network against denial of service attacks with the use of traffic monitoring agents on some nodes. But if the control nodes go down or get...
Modeling based approach is described for analyzing and evaluating Internet server system reliability and availability in this paper. In the given model the states are defined by the different kinds of failures of the server system. The Markov model evaluates the probability of jumping from one known state into the next logical state. The probabilities between transitions of the states are a function...
As the use of public cloud resource has increased, the concern on Quality of Service (QoS) and cost has also increased. Amazon Elastic Compute Cloud (EC2) introduced spot instance in late 2009, to utilize the unused resources in better manner. Price of resource varies as per the availability and requirement of resources. Users bid for the required Spot Instance (SI), it is assigned if the bid price...
Availability of Ships can wholly delegate the specialty of reliability, maintainability and supportability. The parameters of RMS of ships usually submit to logarithmic normal distribution elaborated in the paper. A Quasi Monte Carlo method and it's program of computation are proposed introducing the Halton sequence instead of the pseudorandom numbers of traditional Monte Carlo method to compute the...
In this paper, rejuvenation is modeled in a redundant computer system in order to counteract software aging. The evolution of such a system in time could be modeled by a Markov or a semi-Markov process. Nevertheless, due to generally distributed repair times of system components, the entire system is non -- Markovian. Thus, Monte Carlo simulation methods are used for studying system's evolution in...
In energy-aware information systems, it is critical to discuss how to select a server for each request from clients in order to not only achieve performance objectives but also reduce the total power consumption of a system. In addition, application requests have to be reliably performed in presence of server faults. In our previous studies, the improved power consumption laxity based (IPCLB) algorithm...
High availability in cloud computing services is essential for maintaining customer confidence and avoiding revenue losses due to SLA violation penalties. Since the software and hardware components of cloud infrastructures may have limited reliability, fault tolerance mechanisms are a means of achieving the necessary dependability requirements. This paper investigates the benefits of a warm-standy...
The MapReduce programming paradigm is gaining more and more popularity recently due to its merits of ease of programming, data distribution and fault tolerance. The low barrier of adoption of MapReduce makes it a promising framework for non-dedicated distributed computing environments. However, the variability of hosts resources and availability could substantially degrade the performance of MapReduce...
This paper deals with the availability analysis of a Lube oil system used in a combined cycle power plant. The system is modeled as a Generalized Stochastic Petri Net (GSPN) and analyzed using Monte Carlo Simulation method. The superiority of this approach over others is demonstrated. The proposed GSPN is a promising tool that can be conveniently used to model and analyze any complex systems.
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