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Paper ID: 1481

Dynamic Data Replication in LCG 2008
Caitriana,Nicholson David G,Cameron Anthony T,Doyle A Paul,Millar Kurt,Stockinger

Appeared in: Proceedings of the UK e-Science All Hands Conference 2006 website: http://www.allhands.org.uk/2006/
Page Numbers:112 - 120
Publisher: National e-Science Centre
Year: 2006
ISBN/ISSN: 0-9553988-0-0
Contributing Organisation(s):
Field of Science: e-Science

URL: http://www.allhands.org.uk/2006/proceedings/papers/613.pdf

Abstract: To provide performant access to data from high energy physics experiments such as the Large Hadron Collider (LHC), controlled replication of files among grid sites is required. Dynamic, automated replication in response to jobs may also be useful, and has been investigated using the grid simulator OptorSim. In this paper, results from simulation of the LHC Computing Grid in 2008, in a physics analysis scenario, are presented. These show, first, that dynamic replication does give improved job throughput; second, that for this complex grid system, simple replication strategies such as LRU and LFU are as effective as more advanced economic models; third, that grid site policies which allow maximum resource sharing are more effective; and lastly, that dynamic replication is particularly effective when data access patterns include some files being accessed more often than others, such as with a Zipf-like distribution.

Keywords: e-Science, AHM 2006


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