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OGSA-DAI Installation Guide for NGS: Middleware for Data Services

Learn how to install the OGSA-DAI user interface for the National Grid Service (NGS) at NeSC. Discover how this middleware supports replica files, logical filenames, cataloging, and virtual filesystems for structured data like RDBMS and XML databases. Explore the seamless access and manipulation of data resources on the Grid without hiding the underlying data model.

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OGSA-DAI Installation Guide for NGS: Middleware for Data Services

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  1. OGSA-DAIInstalling a User Interface for the NGSNeSC, Edinburgh17 Jan 2006Richard Hopkins

  2. Acknowledgments • Matt Ford, NGS Induction Workshop (Dec. 2004, NeSC) • Neil Chue Hong , OGSA-DAI Tutorial GGF13 • OGSA-DAI website, www.ogsadai.org NGS UI Install, NeSC, Jan 2006 OGSA-DAI

  3. Simple data files Middleware supporting Replica files Logical filenames Catalogue: maps logical name to physical storage device/file Virtual filesystems, POSIX-like I/O Storage Resource Broker Structured data RDBMS, XML databases Require extendablemiddleware tools to support Move computation near to data easy access, controlled by AA integration and federation OGSA -DAI Data services on NGS NGS UI Install, NeSC, Jan 2006 OGSA-DAI

  4. OGSA-DAI Provides • Access to and updating of data resources • Exposure of Data Resources to the Grid • Additional data manipulation functionality at the service level • Uniform access to disparate, heterogeneous data resources • Does not hide underlying data model • Data resources exposed through services • Clients interact with these services NGS UI Install, NeSC, Jan 2006 OGSA-DAI

  5. DAISGR GDS GDSF Service Types • OGSA-DAI uses three main service types • DAISGR (registry) for discovery • GDSF (factory) to represent a data resource • GDS (data service) to access a data resource locates creates represents accesses Data Resource

  6. Interacting with Data Resources • Activity: The data resource manipulation, data transformation and delivery actions that the client wants the service to perform. • Think of sending the job to the data not the data to the job. • Perform documents: Used by clients to specify to the services the activities they want executed. • Response documents: Used by the services to inform clients as to the status of execution of their Perform documents and, often, to also return data to a client. NGS UI Install, NeSC, Jan 2006 OGSA-DAI

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