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Grid-Ireland, the national computational grid for Ireland, has a centrally managed core infrastructure: the installation and configuration of grid gateways at constituent sites are controlled from an Operations Centre based at Trinity College Dublin. We have developed tools to automate and simplify the deployment of Grid middleware to these sites. Virtual machine (VM) technology has performed an important role, allowing us to maximise the utilisation of server hardware and to simplify installation and management procedures. By running multiple OS instances, each on a VM, a full LCG-compatible Grid gateway can be hosted on a single computer. This has significantly reduced the hardware, installation and management investment needed to deploy a new site. In this paper, we summarise an evaluation of competing VM technologies and relate our experience with virtual machines to date. We also describe a single-computer Grid gateway based on the Xen VM system which we plan to deploy to eleven new sites in early 2005. [ABSTRACT FROM AUTHOR]

R-GMA (Relational Grid Monitoring Architecture) [1] is a grid monitoring and information system that provides a global view of data distributed across a grid system. R-GMA creates the impression of a single centralised repository of information, but in reality the information can be stored at many different locations on the grid. The Registry and Schema are key components of R-GMA. The Registry matches queries for information to data sources that provide the appropriate information. The Schema defines the tables that can be queried. Without the combined availability of these components, R-GMA ceases to operate as a useful service. This paper presents an overview of R-GMA and describes the Registry replication design and implementation. A replication algorithm for the Schema has also been designed. [ABSTRACT FROM AUTHOR]

A heterogeneous implementation of the current LCG2/EGEE grid computing software is supported in the Grid-Ireland infrastructure. The porting and testing of the current softwareversionofLCG2iswellunder way on Red Hat 9, Fedora Core 2, IRIX and AIX. The issues concerned are discussed, and recommendations are presented for improvement of portability to non-reference operating systems. [ABSTRACT FROM AUTHOR]

Grid-Ireland is unusual in its integrated infrastructure, and the stress that is laid on homogeneity of its core. The major benefit is the decoupling of site details from the core infrastructure, and the resulting freedom for heterogeneity of site resources. We describe the efforts to support this heterogeneity in a systematic way. We also describe the deployment architecture and a methodology to increase the availability of the core infrastructure. [ABSTRACT FROM AUTHOR]

We describe SANTA-G (Grid-enabled System Area Networks Trace Analysis), an instrument monitoring framework that uses the R-GMA (Relational Grid Monitoring Architecture). We describe the CanonicalProducer, the component that allows for instrument monitoring, and how it would be used to construct the basis of a Grid-wide intrusion detection system. [ABSTRACT FROM AUTHOR]

This paper examines the availability of grid infrastructures, describes the principles of transactional grid deployment, outlines the design and implementation of a transactional deployment system for the Grid-Ireland national grid infrastructure based on these principles, and estimates the resulting availability. [ABSTRACT FROM AUTHOR]