As the Internet continues to experience a tremendous expansion in number of users and services today, the importance of satisfying service availability becomes recently one of the most critical factors for the success of “Internet services” such as the World Wide Web, peer-to-peer file sharing and digital audio/video streaming. In this thesis, we take an availability-centric view on end-to-end ...

In distributed systems, communication cost is one of the major concerns. Many existing research have been conducted on placement of data to reduce communication cost and improve performance in widely distributed systems. All these research works focus on independent data objects. However, data are correlated due to accesses from clients and the correlation has some impact on date placement. In ...

QoS-aware replica placement decides how many replicas are needed and where to deploy them to meet every request from individual clients. In this paper, a novel three-phase algorithm, namely CPI, is proposed. By dividing candidate nodes into proper medium-scale partitions, CPI is capable to handle with large-scale QoS-aware replica placement problem. Pharos-based clustering algorithm obtains ide...

Replica placement is one of the important factors to improve performance in data grid systems. A good replica placement algorithm can result in good performance gains. It should be mentioned that, these algorithms or strategies are dependent on architecture of the data grid. By considering different kinds of architecture in data grid systems, a true representation of a grid is a general graph. ...

Recently there has been significant research focus on distributed computing network massively caching and replica placement problems for content distribution in globally. Peer-to-Peer (P2P) network provides dynamically decentralized, self organized, scalable objects in distributed computing system. However such networks suffer from high latency, network traffic and cache update problems. The ex...

The replica server placement problem determines the optimal location where replicated servers should be placed in content distribution networks, in order to optimize network performance. The estimated traffic demand is fundamental input to this problem and its accuracy is essential for the target performance to be achieved. However, deriving accurate traffic demands is far from trivial and unce...

Data Grid is an infrastructure that manages huge amount of data files, and provides intensive computational resources across geographically distributed collaboration. To increase resource availability and to ease resource sharing in such environment, there is a need for replication services. Data replication is one of the methods used to improve the performance of data access in distributed sys...

Data grid is an infrastructure built based on internet which facilitates sharing and management of geographically distributed data resources. Data sharing in data grids is enhanced through dynamic data replication methodologies to reduce access latencies and bandwidth consumption. Replica placement is to create and place duplicate copies of the most needed file in beneficial locations in the da...

Data Grid is composed of a large number of distributed computation and storage resources to facilitate the management of the huge distributed and sharing data resources efficiently. Dynamic replication can reduce the file storage time and use the grid resources effectively in a Data Grid environment. The Data Grid topology is divided into three layers: Regional level, LAN level, the grid site l...