Speaker
Dr
Josva Kleist
(Nordic Data Grid Facility)
Description
The Nordic Data Grid Facility (NDGF) consists of Grid resources running ARC
middleware in Scandinavia and other countries. These resources serve many virtual
organisations and contribute a large fraction of total worldwide resources for the
ATLAS experiment, whose data is distributed and managed by the DQ2 software. Managing
ATLAS data within NDGF and between NDGF and other Grids used by ATLAS (the LHC
Computing Grid and the Open Science Grid) presents a unique challenge for several
reasons. Firstly, the entry point for data, the Tier 1 centre, is physically
distributed among heterogeneous resources in several countries and yet must present a
single access point for all data stored within the centre. The middleware framework
used in NDGF differs significantly from other Grids, specifically in the way that all
data movement and registration is performed by services outside the worker node
environment. Also, the service used for cataloging the location of data files is
different from other Grids but must still be useable by DQ2 and ATLAS users to locate
data within NDGF. This paper presents in detail how we solve these issues to allow
seamless access worldwide to data within NDGF.
Authors
Dr
Adrian Taga
(Oslo University)
Dr
David Cameron
(Nordic Data Grid Facility)
Dr
Gerd Behrmann
(Nordic Data Grid Facility)
Dr
Josva Kleist
(Nordic Data Grid Facility)
Dr
Mattias Ellert
(Nordic Data Grid Facility)
