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Traditional cloud stacks are designed to tolerate server or rack-level failures, that are unpredictable and uncorrelated. � Such stacks successfully deliver highly-available cloud services at global scale. The increasing criticality of cloud services to the overall world economy is causing concern about the impact of power outages, cyber-attacks, configuration errors, or other causes of datacenter...
Failure in cloud system is defined as an even that occurs when the delivered service deviates from the correct intended service. As the cloud computing systems continue to grow in scale and complexity, there is an urgent need for cloud service providers (CSP) to guarantee a reliable on-demand resource to their customers in the presence of faults thereby fulfilling their service level agreement (SLA)...
Cloud services may suffer from outages, which interrupt customers' activities and result in economic losses. A linear model is proposed here to translate outages into economic losses, accounting for both the frequency and the duration of outages. Two tools, the exceedance loss probability and the Value-at-Risk, are employed to assess the maximum economic exposure of a customer. The use of both tools...
Availability is an important non-functional requirement for carrier grade services. Cloud computing is gaining in popularity but availability remains one of its main challenges in order to convince carrier grade service providers to migrate to the cloud. Several solutions, including Pacemaker/Corosync, have been proposed for managing the availability of cloud systems. On the other hand, OpenSAF, an...
More and more software developers and information-technology professionals embrace the container technology, because it packs the required libraries and settings of software into a single image so that the deployment can be easily done anywhere without the issues of compatibility. On top of single containers, orchestration tools are essential to automate the deployment and operation of complex systems...
Nowdays, several streaming servers are available to provide a variety of multimedia applications such as Video on Demand in cloud computing environments. These environments have the business potential because of the pay-per-use model, as well as the advantages of easy scalability and, up-to-date of the packages and programs. This paper uses hierarchical modeling and different sensitivity analysis...
Large-scale virtualized datacenters require considerable automation in infrastructure management in order to operate efficiently. Automation is impaired, however, by the fact that deployments are prone to multiple types of subtle faults due to hardware failures, software bugs, misconfiguration, crashes, performance degraded hardware, etc. Existing Infrastructure-as-a-Service (IaaS) management stacks...
Wireless Sensor Networks (WSNs) are spatially dispersed networks furnished with a large number of nodes for monitoring and recording various environmental conditions. These networks are restrained in terms of their processing power, storage resources, and battery life. In other words, they are not themselves proficient in performing such diverse task set like localization of nodes, data processing...
It is becoming more common to see software applications taking advantage of the many RESTful web services available publicly to meet their needs rather than developing an in-house solution. This introduces the problem where failures can occur in the network or on the service provider outside the influence of a developer. This paper introduces a reliability-aware framework with a focus on availability...
Cost-effective cloud storage services attract users with their convenience; there is a trade-off between the service availability and the usage cost. We develop two cloud provider selection models for cloud storage services to minimize the total cost of usage. The models select multiple cloud providers with considering unavailability to meet the user requirements. The first model, called a user-copy...
Predicting the amount of resources available to system's users has become a task of interest to services providers even with the advent of elastic cloud computing, because the number of resources is finite despite being virtually infinite on the customer view. This paper proposes a model to evaluate node's capacity in a cloud computing environment based on the amount of available hardware resources...
As the cloud storage is becoming center part for storing data remotely, user no longer store his data in local depository and user can access data from anywhere. Mostly the users store their data to public cloud, it reduces the storage management of data locally. But there are also security issues such as confidentiality, integrity and availability. Shen et al. [6] has proposed an effective integrity...
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 services often come with security issues such as confidentiality and integrity. The problem scenario ranges multi-fold: to secure organizational data from peer organizations, to provide sharing of data files between users keeping the identity anonymous, handling recovery of vital data modules, etc. This paper proposes a solution in order to eliminate the above mentioned problems. The solution...
Multi-cloud systems have been gaining popularity due to the several benefits of the multi-cloud infrastructure such as lower level of vendor lock-in and minimize the risk of widespread data loss or downtime. Thus, the multi-cloud infrastructure enhances the dependability of the cloud-based system. However, it also poses many challenges such as nonstandard and inherent complexity due to different technologies,...
The article is an extension of this paper1. It describes methods for dealing with reliability and fault tolerance issues in cloud-based datacenters. These methods mainly focus on the elimination of a single point of failure within any component of the cloud infrastructure, availability of infrastructure and accessibility of cloud services. Methods for providing the availability of hardware, software...
Data generation and its utilization in important decision applications has been growing an extremely fast pace, which has made data a valuable resource that needs to be rigorously protected from attackers. Cloud storage systems claim to offer the promise of secure and elastic data storage services that can adapt to changing storage requirements. Despite diligent efforts being made to protect data,...
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...
In nowadays cloud computing systems, leveraging the virtualization technology, the customer's requested data computing or storing service is accommodated by a set of mutual-communicated Virtual Machines (VM) in a scalable and elastic manner. These VMs are placed in one or more datacenter nodes according to nodes' capacities, failure probabilities, etc. The VM placement availability refers to the probability...
Third-party measurements of cloud availability are needed as a checkpoint of cloud providers' quality statements, and ICMP has been proposed to carry on such measurements. Simple ICMP-based measurement schemes, however, provide a poor discrimination between false outages and true cloud outages, unless the cloud outage probability is quite higher than the packet loss rate incurred by probing packets...
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