Fermilab Computing Division

CS Document 1265-v1

CHEP06 abstract - The SAM-Grid / LCG interoperability system: a bridge between two grids

Document #:
CS-doc-1265-v1
Document type:
Conference
Submitted by:
Stuart C. Fuess
Updated by:
Stuart C. Fuess
Document Created:
13 Nov 2005, 23:33
Contents Revised:
07 Mar 2006, 09:04
Metadata Revised:
19 Oct 2006, 15:55
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Abstract:
The SAM-Grid system is an integrated data, job, and information management infrastructure. The SAM-Grid addresses the distributed computing needs of the
experiments of RunII at Fermilab. The system typically relies on SAM-Grid services deployed at the remote facilities in order to manage the computing resources. Such
deployment requires special agreements with each resource provider and it is a labor intensive process. On the other hand, the DZero VO has also access to computing
resources through the LCG infrastructure. In this context, resource sharing agreements and the deployment of standard middleware are negotiated within the framework of the EGEE project.

The SAM-Grid / LCG interoperability project was started to let DZero users retain the user-friendlyness of the SAM-Grid interface, allowing, at the same time, access to
the LCG pool of resources. This "bridging" between grids is beneficial for both the SAM-Grid and LCG, since it minimizes the deployment efforts of the SAM-Grid team and
exercises the LCG computing infrastructure with data intensive production applications of a running experiment.

The interoperability system is centered around job "forwarding" nodes, which receive jobs prepared by the SAM-Grid and submit them to LCG. This paper discusses the
architecture of the system and how it addresses inherent issues of service accessibility and scalability. The paper also presents the operational and support challenges that arise to operate the system in production.

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Keywords:
CHEP
Associated with Events:
CHEP2006 held from 13 Feb 2006 to 17 Feb 2006 in Mumbai, India
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