http://www.grid-support.ac.uk
http://www.ngs.ac.uk
Data services on the NGS
http://www.nesc.ac.uk/
http://www.pparc.ac.uk/
http://www.eu-egee.org/
Acknowledgments
• Matt Ford for OGSA-DAI and Oracle slides taken
from his presentations for the NGS Induction
Workshop (Dec. 2004, NeSC)
• Peter Berrisford for SRB slides
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Overview
• OGSA-DAI: database access and integration
– grid-enabled database access….
• GridFTP: a protocol for large file transfer
• The Storage Resource Broker:
– virtual file system for distributed file systems
– Replica files in different locations, catalogue service
to find them.
• But first….
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Oracle and the NGS
• The NGS core nodes, from the outset, have been
partitioned into compute and data clusters.
• As the NGS matures the requirement for data hosting
will grow
• Oracle database: for both users and services offered by
the NGS.
• The RAL and Manchester sites are designated as the
data clusters with each site having the ability to dedicate
up to eight nodes for use by Oracle.
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Oracle and the NGS
Support
• Additional application needed after joining the
NGS
• All enquiries and production support for the
Oracle service is via the Grid Operations
Support Centre (GOSC)
– 9-5 Operational support (monitoring, notification,
maintenance) other times best endeavours basis.
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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 extendable
middleware tools to support
– Move computation near to
data
– easy access, controlled by AA
– integration and federation
• OGSA -DAI
DAI: Data Access and
Integration
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OGSA-DAI
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What is OGSA-DAI?
• The Open Grid Services Architecture Data Access and
Integration project is concerned with constructing
middleware to assist with access and integration of data
from separate data sources via the grid.
• The project was conceived by the UK Database Task
Force and is working closely with the Global Grid Forum
DAIS-WG and the Globus team.
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OGSA-DAI and the NGS
• the OGSA-DAI deployment on the NGS is being actively
developed
• users should expect that procedures may change – it
does not reflect the commitment NGS has to providing a
service.
• Initially the Manchester JISC data cluster has been
charged with deploying the OGSA-DAI service
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OGSA-DAI practical
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