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Particle Physics Data Grid (PPDG) in ATLAS
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PPDG PPDG is developing and integrating Grid-enabled tools for data intensive distributed computing into production quality end-to-end distributed computing solutions for HENP experiments. PPDG is a collaboration of physicists with computer scientists working at the forefront of Grid technologies.

The principal PPDG deliverable for ATLAS in the first year (through June '02) is the delivery of a production distributed data service deployed to users. The purpose of this project is to develop the distributed data manager which will be deployed to meet this deliverable. The production distributed data service is to exist between CERN, the ATLAS Tier 1 facility at BNL, and a number of US ATLAS grid testbed sites (some or all of ANL, LBNL, Boston University, Indiana University, U Michigan, U Oklahoma, and UT Arlington). The objective is a multi-point U.S. Grid (in addition to the CERN link) providing distributed data services as early as possible.

The deployed service will be a vertically integrated suite of tools extending from a number of grid toolkit components (listed below) at the foundation, through a metadata cataloging and distributed data infrastructure that is partly an ATLAS-specific infrastructure layer and partly a generic testbed for exploring distributed data management technologies and approaches, to primarily experiment-specific interfaces to ATLAS users and software.

Project leaders

Torre Wenaus, project leader and physics contact
Jennifer Schopf, computer science contact

Activities

Common components

ATLAS is testing, using, and providing feedback on performance and requirements for a number of common Grid middleware components.

Group pages of PPDG-ATLAS participants

Work plan

The ATLAS PPDG work plan for the next 3 years (commencing about July 1, 2001) is shown here: As much of the ATLAS PPDG work as possible will be done in collaboration with the computer science participants in PPDG. Collaborative PPDG work between computer scientists and the experiments is in these 7 areas. See the proposal for details on these areas and their work packages.
CS-1: Job description language
Definition of job processing requirements and policies, file placement and replication in distributed systems
CS-2: Job scheduling and management
Job processing, data placement, resource discovery and optimization over the grid
CS-3: Monitoring and status reporting
CS-4: Storage resource management
CS-5: Reliable replica management services
CS-6: File transfer services
CS-7: Collect and document experiment practices
ATLAS involvement in these areas through the three years of PPDG is principally in the following work packages (P1 is in CS-1, etc.).
Year 1
  • P3-1 Monitoring and status reporting for initial production deployment
  • P4-1 HRM extensions and integration for local storage system
  • P5-2 Distributed file and replica catalogs between a few sites
  • P6-1 Reliable file transfer
Year 2
  • P1-3 Deployment of job and production computing control
  • P2-2 Remote job submission and management of production computing
  • P3-3 Fully integrated monitoring and availability of information
  • P6-2 Enhanced data transfer and replication services
Year 3
  • P1-4 Extensions to support object collections, event level access etc.
  • P2-4 Distributed data management and enhanced resource discovery and optimization
  • P3-3 Fully integrated monitoring and availability of information to job control and management
  • P4-3 Enhanced resource discovery and scheduling
  • P5-3 Enhanced replication services including cache management

Documents and reports


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