17 research outputs found
A monitoring tool for a GRID operation center
WorldGRID is an intercontinental testbed spanning Europe and the US
integrating architecturally different Grid implementations based on the Globus
toolkit. The WorldGRID testbed has been successfully demonstrated during the
WorldGRID demos at SuperComputing 2002 (Baltimore) and IST2002 (Copenhagen)
where real HEP application jobs were transparently submitted from US and Europe
using "native" mechanisms and run where resources were available, independently
of their location. To monitor the behavior and performance of such testbed and
spot problems as soon as they arise, DataTAG has developed the EDT-Monitor tool
based on the Nagios package that allows for Virtual Organization centric views
of the Grid through dynamic geographical maps. The tool has been used to spot
several problems during the WorldGRID operations, such as malfunctioning
Resource Brokers or Information Servers, sites not correctly configured, job
dispatching problems, etc. In this paper we give an overview of the package,
its features and scalability solutions and we report on the experience acquired
and the benefit that a GRID operation center would gain from such a tool.Comment: Talk from the 2003 Computing in High Energy and Nuclear Physics
(CHEP03), La Jolla, Ca, USA, March 2003, 3 pages, PDF. PSN MOET00
ATLAS and CMS applications on the WorldGrid testbed
WorldGrid is an intercontinental testbed spanning Europe and the US
integrating architecturally different Grid implementations based on the Globus
toolkit. It has been developed in the context of the DataTAG and iVDGL
projects, and successfully demonstrated during the WorldGrid demos at IST2002
(Copenhagen) and SC2002 (Baltimore). Two HEP experiments, ATLAS and CMS,
successful exploited the WorldGrid testbed for executing jobs simulating the
response of their detectors to physics eve nts produced by real collisions
expected at the LHC accelerator starting from 2007. This data intensive
activity has been run since many years on local dedicated computing farms
consisting of hundreds of nodes and Terabytes of disk and tape storage. Within
the WorldGrid testbed, for the first time HEP simulation jobs were submitted
and run indifferently on US and European resources, despite of their underlying
different Grid implementations, and produced data which could be retrieved and
further analysed on the submitting machine, or simply stored on the remote
resources and registered on a Replica Catalogue which made them available to
the Grid for further processing. In this contribution we describe the job
submission from Europe for both ATLAS and CMS applications, performed through
the GENIUS portal operating on top of an EDG User Interface submitting to an
EDG Resource Broker, pointing out the chosen interoperability solutions which
made US and European resources equivalent from the applications point of view,
the data management in the WorldGrid environment, and the CMS specific
production tools which were interfaced to the GENIUS portal.Comment: Poster paper from the 2003 Computing in High Energy and Nuclear
Physics (CHEP03), La Jolla, Ca, USA, March 2003, 10 pages, PDF. PSN TUCP004;
added credit to funding agenc
The INFN-grid testbed
The Italian INFN-Grid Project is committed to set-up, run and manage an unprecedented nation-wide Grid infrastructure. The implementation and use of this INFN-Grid Testbed is presented and discussed. Particular care and attention are devoted to those activities, relevant for the management of the Testbed, carried out by the INFN within international Grid Projects
Analysis of the ATLAS Rome production experience on the LHC computing grid
The Large Hadron Collider at CERN will start data acquisition in 2007. The ATLAS (A Toroidal LHC ApparatuS) experiment is preparing for the data handling and analysis via a series of Data Challenges and production exercises to validate its computing model and to provide useful samples of data for detector and physics studies. The last Data Challenge, begun in June 2004 and ended in early 2005, was the first performed completely in a Grid environment. Immediately afterwards, a new production activity was necessary in order to provide the event samples for the ATLAS physics workshop, taking place in June 2005 in Rome. This exercise offered a unique opportunity to estimate the reached improvements and to continue the validation of the computing model. In this paper we discuss the experience of the "Rome production" on the LHC Computing Grid infrastructure, describing the achievements, the improvements with respect to the previous Data Challenge and the problems observed, together with the lessons learned and future plans
The ATLAS Computing activities and developments of the Italian Cloud
The large amount of data produced by the ATLAS experiment needs new computing paradigms for data processing and analysis, involving many Computing Centres spread around the world. The computing workload is managed by regional federations, called Clouds. The Italian Cloud consists of a main (Tier-1) centre, located in Bologna, four secondary (Tier-2) centres, and a few smaller (Tier-3) sites. In this contribution we describe the Italian Cloud site facilities and the activities of Data Processing, Analysis, Simulation and Software Development performed within the Cloud, and we discuss the tests of the new Computing Technologies contributing to the ATLAS Computing Model evolution
ATLAS computing activities and developments in the Italian Grid cloud
The large amount of data produced by the ATLAS experiment needs new
computing paradigms for data processing and analysis, which involve many computing centres spread around the world. The computing workload is managed by regional federations,
called ”clouds”. The Italian cloud consists of a main (Tier-1) center, located in Bologna, four secondary (Tier-2) centers, and a few smaller (Tier-3) sites. In this contribution we describe the Italian cloud facilities and the activities of data processing, analysis, simulationand software development performed within the cloud, and we discuss the tests of the new computing technologies contributing to evolution of the ATLAS Computing Model
Activities and performance optimization of the Italian computing centers supporting the ATLAS experiment
With this work we present the activity and
performance optimization of the Italian computing centers
supporting the ATLAS experiment forming the so-called Italian
Cloud. We describe the activities of the ATLAS Italian Tier-2s
Federation inside the ATLAS computing model and present some
Italian original contributions. We describe StoRM, a new Storage
Resource Manager developed by INFN, as a replacement of
Castor at CNAF - the Italian Tier-1 - and under test at the Tier-2
centers. We also show the failover solution for the ATLAS LFC,
based on Oracle DataGuard, load-balancing DNS and LFC
daemon reconfiguration, realized between CNAF and the Tier-2
in Roma. Finally we describe the sharing of resources between
Analysis and Production, recently implemented in the ATLAS
Italian Cloud with the Job Priority mechanism