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OGSA-DAI Installing a User Interface for the NGS NeSC, Edinburgh 17 Jan 2006 Richard Hopkins. Acknowledgments . Matt Ford, NGS Induction Workshop (Dec. 2004, NeSC) Neil Chue Hong , OGSA-DAI Tutorial GGF13 OGSA-DAI website, www.ogsadai.org. Simple data files Middleware supporting

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ogsa dai installing a user interface for the ngs nesc edinburgh 17 jan 2006 richard hopkins

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

acknowledgments
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

data services on ngs
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

ogsa dai provides
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

service types

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

interacting with data resources
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