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In current cloud computing systems, when leveraging virtualization technology, the customer’s requested data computing or storing service is accommodated by a set of communicated virtual machines (VM) in a scalable and elastic manner. These VMs are placed in one or more server nodes according to the node capacities or failure probabilities. The VM placement availability refers to the probability that...
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...
Availability is one of the key requirements for modern networked system. Availability of a virtualized system can be modelled and analyzed using stochastic models. In our previous work, availability of a virtualized system was modeled using a hierarchical model to incorporate the detailed behavior of virtual machines (VMs)' failure and recovery with respect to the system behavior. In particular, a...
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...
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...
Nowadays, universities and research institutes are more and more feeling the need to establish collaboration networks for sharing skills, as well as material, human, software and virtualized resources. This refers to the idea of Virtual Organizations (VOs) which allow any user of a member organization to access technological and pedagogical resources available in another partner organization. However,...
Cloud computing technology is a relatively new concept of providing dramatically scalable and virtualized resources, software and hardware on demand to consumers. Cloud Computing offers a whole new paradigm to provide users with high end and scalable infrastructure at an affordable cost. It is based on many new technologies like virtualization and distributed computing. However, security concerns...
In the past few years, there has been a steady increase in the attention, importance and focus of green initiatives related to data centers. While various energy aware measures have been developed for data centers, the requirement of improving the performance efficiency of application assignment at the same time has yet to be fulfilled. For instance, many energy aware measures applied to data centers...
Cloud computing platform relies on principle of sharing of resources. VMware products and OpenStack are the cloud platforms being used extensively in the industry. Of which OpenStack is the new competitor, which provides support for hybrid cloud environment. We compare features of VMware products and OpenStack in this paper. Resources in cloud include computing resources, storage and network. These...
The recent decade witnesses the prevalence of hybrid storage systems that offer storage based on diverse storage devices to achieve both cost savings and performance improvements. However, there have been little of studies focusing on the challenging scenario of providing hybrid block storage for Virtual Machines (VMs), which is subject to several stringent requirements such as availability and scalability...
Power and performance tradeoffs are critical and challenging issues faced by cloud service providers (CSPs) while managing their data centers. On the one hand, CSPs strive to reduce power consumption of their data centers to not only decrease their energy costs but to also reduce adverse impact on the environment. On the other hand, CSPs must deliver performance expected by the applications hosted...
The huge earthquake struck Japan on 11th March, 2011, caused a massive congestion of call attempts from mobile phones that resulted in only 5% of accepted connections due to the congestion control by telephone companies. It is an emergent issue to improve resiliency of communication service in anticipation of future disasters and thus communication service infrastructure necessitates the flexibility...
The service-oriented hosts in enterprises like ERP system have always encountered the crucial problem of unexpected down-time or system failure that will cause data loss and system termination. Failover is a challenge issue that it cannot be done successfully between physical hosts. Therefore this paper introduces high availability architecture to build an in-cloud Enterprise Resources Planning together...
The idea of computing utility incarnated by the cloud paradigm is gaining a lot of success, both for entertainment and business applications. The consequent increasing demand of computing, storage and communication resources within data centers is fostering new forms of infrastructure sharing such as cloud federations, which can take advantage of virtualization technologies and, in particular, of...
Performance and availability are key aspects to evaluate the quality of cloud computing systems. The assessment of these systems should consider the effects of queuing and failure/recovery behavior of data center subsystems and disaster occurrences. Additionally, penalties may be applied if the defined quality level of SLA contracts is not satisfied. Thus, IaaS providers need to evaluate the performability...
Until now if you want to implement High Availability and Disaster Recovery for our business critical applications we would have to invest in Geo-Cluster Technologies which is absolutely not affordable for Small and medium business customers. Now the arrival of Windows Server 2012 brings with its perfectly acceptable disaster recovery solution for business applications which are running on hyper-V...
Recovery is a promising approach for building intrusion tolerant systems that remove or minimize the effects of malicious attacks. In this paper, a Virtualization-based Recovery approach for Intrusion Tolerance systems (VRIT) is proposed. We present the architecture of the VRIT, construct the state transition model of the VRIT, and analyze quantitatively the security of the VRIT system. We characterize...
The paper examines the challenges of defining and measuring availability to support real-word service comparison and dispute resolution through SLAs. We propose a rigorous and unambiguous definition of availability in cloud services. In the light of this, we show that what appear to be apples-for-apples comparisons between real-world SLAs are often based on ambiguous definitions, and even where SLAs...
Providing high availability in a diverse client demand scenario is a key challenge of cloud computing providers. A possible approach to protect cloud systems from natural disasters corresponds to the utilization of redundant data centers located far enough apart. The time to migrate a virtual machine (VM) from a data center to another increases due to distance. As this time impacts the overall system...
Today, many organizations are concerned with keeping their information infrastructure running smoothly and ensuring that users have continuous access to fundamental resources, even in the face of disasters and disruptions. Citrix Xenserver provides a robust set of virtualization technologies to help improve the resilience and usefulness of an organization's in order infrastructure, ensure that not...
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