Storage is undoubtedly one of the main resources in data grids, and planning the capacity of storage nodes is an important step in any data-grid design. This paper focuses on storage-capacity planning for data grids. We have developed a tool to calculate, for a specific scenario, the minimum capacity required for each storage node in a grid, and we have used this tool to show that different str...

Data Grid is a good solution to large scale data management problems including efficient file transfer and replication. Dynamic data replication in Data Grid aims to improve data access time and to utilize network and storage resources efficiently. Since the data files are very large and the Grid storages are limited, managing replicas in storages for the purpose of more effective utilization o...

Unlike traditional high performance computing environment, such as supercomputers, the cloud computing is a collection of interconnected and virtualized computing resources that are managed to be one or more unified computing resources. The Cloud environment constitutes a heterogeneous and a highly dynamic environment. Failures on the data centers storage nodes are normal rather than exceptiona...

Efficient I/O on large-scale spatiotemporal scientific data requires scrutiny of both the logical layout of the data (e.g., row-major vs. column-major) and the physical layout (e.g., distribution on parallel filesystems). For increasingly complex datasets, hand optimization is a difficult matter prone to error and not scalable to the increasing heterogeneity of analysis workloads. Given these f...

Data Grids provide geographically distributed resources for large-scale data-intensive applications that generate large data sets. However, ensuring efficient access to such huge and widely distributed data is hindered by the high latencies of the Internet. We address these challenges by employing intelligent replication and caching of objects at strategic locations. In our approach, replicatio...

A new insight is revealed by Anglana et al. 128 kb of the single, primary (high frequency) oriGNA13. mary origin represses initiation at the secondary origins. Moreover, increasing the nucleotide pool by addition of DNA precursors to the culture medium reduces the frequency of initiation at secondary origins, whereas reducing the nucleotide pool by addition of hydroxyurea (a specific inhibitor ...

Cloud computing has attracted a great deal of attention in both academia and industry. We envision the provisioning of differentiated services as being one of the key components to the success of cloud computing. Unfortunately, this issue has not been fully addressed in the past. Realizing that different users might have different requirements regarding availability, reliability, durability, re...

Mobile data management has been an active area of research for the past fifteen years. Besides dealing with mobility itself, issues central in data management for mobile computing include low bandwidth, intermittent network connectivity and scarcity of resources with emphasis on power management. In this article, we focus on how caching and replication in mobile data management address these ch...

We present a transactional and concurrent replication scheme that is designed for hybrid data store architectures. The system design and the requirements are motivated by the real business cases we encountered during the development of our commercial database product. We consider two databases where the original database handles read/write transactional application workloads while the second da...

Data replication is a widely used technique for achieving fault tolerance and improved performance. With the advent of content delivery networks, it is becoming more and more frequent that data content is placed on hosts that are not directly controlled by the content owner, and because of this, security mechanisms to protect data integrity are necessary. In this paper we present a system archi...