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In this letter, we investigate a class of codes with the following property: any decodable set of erased symbols can be repaired from any single set of several disjoint symbol sets with small cardinality. We refer such codes to locally repairable codes (LRCs) with joint availability. In particular, if information symbols of a code have this property, then we refer the code to an LRC with joint information...
The growing importance of huge amount of data and the data analysis for business agility has prophesied managerial decisions to ensure data security and disaster recovery options. This growing dependency has triggered extensive storage of data and development of ‘high availability’ databases. One of the prevalent practices in the industry is to provide for a data center (DC) where the on-going service...
Cloud-based file systems are widely accepted and adopted for personal and business purposes in recent years. Statistics shows that approximately 25% of file operations from a typical user are random writes. Inherited from traditional disk-based file systems, most distributed file systems are also based on objects or chunks of fixed sizes, which work well for sequential writes but poorly for random...
Distributed computing is a new paradigm in the field of resource sharing. Distributed computing seems as more promising in terms of request failure, security, flexibility and resource availability. It's main feature is to maintain the Quality of Service (QoS) provided to the end user in term of request processing power, request failure rate and many more. So resource management is important and maintaining...
Distributed storage systems have greatly evolveddue to cloud computing upsurge in the past several years. Thedistributed file systems inherit many components fromcentralized ones and use them in a distributed manner. There aretwo ways to grow the storage capacity: by scaling-up or byscaling-out and growing the number of storage devices in astorage system. The growth of storage devices impose manychallenges...
In view of the present situation of data management for intelligent transportation, this paper proposes a multi-source data organization and management method. It uses a combination of centralized and distributed organization mode, with hierarchical model of data management and query mapping conversion mechanism to achieve multi-source traffic data isolated storage and transparent management. Finally,...
The Temporal database is one of the databases that manipulate by append-only policy instead of updating in-place. The data in these databases have two main features: valid-time and transaction-time. Since, the data aren't deleted in temporal database; instead they are increasingly expanded and grown up, it's necessary to adopt a mechanism for controlling the volume and capacity of the database. In...
This paper presents a prototype system for generalized searching of cloud-scale biometric data as well as an application of this system to the task of matching a collection of synthetic human iris images. First, we discuss growth trends in the biometric technology market that warrant the application of new data storage and retrieval technologies. Next, we discuss the considerations that motivated...
Cloud computing represents a new IT model for consumption and delivery of the services over the Internet. Cloud computing is a natural evolution of the widespread adoption of virtualization, service-oriented architecture and utility computing.
Growing core counts have highlighted the need for scalable on-chip coherence mechanisms. The increase in the number of on-chip cores exposes the energy and area costs of scaling the directories. Duplicate-tag-based directories require highly associative structures that grow with core count, precluding scalability due to prohibitive power consumption. Sparse directories overcome the power barrier by...
Replica management has become a hot research topic in data grid, It improves the availability and fault tolerant of data in grid computing environment. Based on the deep research on the mainstream replica management technology in traditional data grid, we propose a dynamic replica management strategy. Our replica management strategy consists of the creation method of dynamic replica that can automatically...
Replication in distributed environment has become increasingly popular due to its high degree of availability, fault tolerance and enhance the performance of a system. These advantages of replication are important because it enables organizations to provide users with access to current data where and when user needed at anytime or anywhere, even if the users are geographically remote. However, this...
Large scientific projects need collaborative data sharing environments. For projects like the Ocean Observations Initiative (OOI), the Temporal Dynamics of Learning Center (TDLC) and Large-scale Synoptic Survey Telescope (LSST) the amount of data collected will be on the order of Petabytes, stored across distributed heterogeneous resources under multiple administrative organizations. Policy-oriented...
It is well known that the primary objective of a world wide business organization is to find a way to improve the delivery of services and facilities for business interactions. Advancements in information and communication technologies especially in the field of networking can be utilized to enhance the co-ordination and enforcement policies of such organizations. The information needed by an organization...
We describe a system for sharing distributed XML data among organizations using customizable schema. In our system, each organization can customize common DTD (Document Type Definition) within the bound of rule to create its own DTD, which is called customized DTD. And then it can describe information with tags according to the customized DTD. Basically, the upper structure of shared XML data is common...
Data is becoming more and more important in the current computing environment and enterprise application. In the grid, many systems and middleware aim to hide the heterogeneity of the data resources and to provide a unified way to access them. However, there are a few systems focusing on data integration which means combining structured and unstructured data residing at different data resources and...
In high performance computing environment, the metadata servers of distributed file system become critical to impact overall system performance. An approach of memory based metadata server is proposed, instead of the disk based approach. We present a metadata management system with matrix organization, non-overhead reliable mechanism and static scalability method, which is design to efficiently utilize...
Data centers (DC) suffer from an increasing number of threats; these are exaggerated by the incredible growth of critical data volumes in addition to vulnerabilities in technologies used for distributed architectures. This paper demonstrates the need to define a new metric for ldquoresilience levelrdquo to complement other system metrics such as performance, availability, robustness and fault tolerance...
This paper presents the goal, accomplishments and research issues of an NSF project. The project aims to develop a distributed event-triggered knowledge sharing network (ETKnet) for government organizations to share, not only data and application operations, but also knowledge embedded in organizational and inter-organizational policies, regulations, data and security constraints as well as collaborative...
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