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Using OGSA-DAI to Grid enable data for the Arts, Humanities and Social Sciences - part 2, Web Based
Event
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OGSA-DAI is an extensible toolkit middleware to expose data resources to grids. These resources may be relational databases, XML-databases, or files - and extensions can be developed to permit OGSA-DAI to support additional resources (such as the Open Geospatial Consortium web services used by the geographical communities). OGSA-DAI executes workflows that access, transform and deliver data and these can minimise the need for the transfer of large amounts of data around a Grid.
This
event is a pre-requisite for a consultancy/workshop with the OMII-UK OGSA-DAI team on 23-25 March.
Participants in this web-based event will need to:
1. Have an e-science
certificate - see here If you
do not have a certificate already - apply NOW!!
2. Register for this event here
Further guidance and instructions will be sent to registered participants.
3. Apply for (or already
have) an NGS account. (One of the practicals to be made available later in the course will show use of OGSA-DAI
on NGS resources). To apply for an NGS account see here.
You are welcome to join the event at any time before 22 April. It is expected that between 2 and 3 days effort is needed to gain full benefit from this course.
Introductory talks
- Short introduction to OGSA-DAI for this course here
- Talk from the International Summer School for Grid Computing here
Using the OGSA-DAI client toolkit
To follow these practicals you need to have registered and been given an account on a TOE machine.
- connecting to the machine on which you can run the client-side practicals - here
- Three
practical exercises give experience of the client toolkit with increasing levels of difficulty. (these are rthe same
exercises given in the course
in March 2008 at eSI.) BUT - note that you need to add security as
described here.
- You can also try to run your OGSA-DAI client programs on an NGS node, see this page for how to do it.
Once you have understanding of the concepts and the use of the client toolkit, you are ready to proceed to....
Installation of OGSA-DAI
(This is the same material already given in the course in March 2008 at eSI.)
You will need to have been given access to a virtual machine on which you are going to install first Globus Toolkit 4, and hten add to that container the OGSA-DAI service.
OGSA-DAI can also be installed to work with Tomcat Axis which is a Web-service platform, see OGSA-DAI Documation for details.
Creating new activities
When a dataset is exposed by OGSA-DAI (How to expose a dataset?), a set of activities is available for data resources such as relational databases. These activites are composed into workflow by use of the OGSA-DAI client toolkit - as the early practicals showed.
New activities can be created - to add to the richness of workflow that is executed close to the data resource, in the OGSA-DAI service.
The objective of the next practial exercise is to show how to create a new activity. This will require a half-day to follow.
Additional Talks
- OGSA-DAI and the National Grid Service
- OGSA-DAI
portlets in P-Grade
- P-Grade is a portal used in NGS and EGEE applicaitons communities.
- This talk is included here to see if it provokes interest from participants
- Portlets, currently in pre-release with OGSA-DAI
2 expose routine client functionality alongside the established P-Grade functionality for composing nad executign workflow
on gids, whnere each element in the workflow comprises a job (parallelised or sequential) that takes files as inputs, and
creates files as outputs.
- P-Grade is a portal used in NGS and EGEE applicaitons communities.
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