DOSAR Workshop, Sao Paulo, Brazil, September 16-17, 2005 LCG Tier 2 and DOSAR Pat Skubic OU

DOSAR Workshop, Sao Paulo, Brazil, September 16-17, 2005 Outline Introduction to LCG List of LHC Tier 2 Centers Status of ATLAS SW Tier 2 Questions for Discussion Action Items?

DOSAR Workshop, Sao Paulo, Brazil, September 16-17, 2005

DOSAR Workshop, Sao Paulo, Brazil, September 16-17, 2005 Development Areas Applications Fabric Grid Deployment Grid Technology ARDA- A Realization of Distributed Analysis for LHC

DOSAR Workshop, Sao Paulo, Brazil, September 16-17, 2005 Applications

DOSAR Workshop, Sao Paulo, Brazil, September 16-17, 2005

DOSAR Workshop, Sao Paulo, Brazil, September 16-17, 2005 Grid Deployment Organization

DOSAR Workshop, Sao Paulo, Brazil, September 16-17, 2005 Grid Technology Activities Overall Requirements Technology Tracking Middleware Development Middleware Recommendations

DOSAR Workshop, Sao Paulo, Brazil, September 16-17, 2005 Overall Requirements Keep a clear view of the emerging requirements for the LHC computing including batch and interactive analysis. The HEPCAL document is the starting point for this. Track the grid activities within the experiments and help disseminate the experiences gained Disseminate the need for high quality infrastructure services and work towards their technical realization Work towards a systems architecture for grid technology to support the project

DOSAR Workshop, Sao Paulo, Brazil, September 16-17, 2005 Technology Tracking Monitor closely the technology evolution and “put into practice” the technologies as they mature in production. Work with the experiments to perform structured tests will be required. This may also involve working with industry and other sponsored developments to prototype and test solutions as they emerge Study the system architecture issues as experience is gained in order to steer the technology evolution

DOSAR Workshop, Sao Paulo, Brazil, September 16-17, 2005 Middleware Development Seek strategic advice from the individuals driving the multiple projects producing the core technologies Work towards one set of common and complementary projects encompassing the efforts underway. This involves participating in the plans for funding future projects Identify key developments that are required for the LHC computing grid that are not developed as part of existing projects and promote their development.

DOSAR Workshop, Sao Paulo, Brazil, September 16-17, 2005 Middleware Recommendations Recommend a coherent technology suite to be deployed to regional centers. This has to be done taking into account the matching with the LHC requirements Develop a plan for the evolution of this suite as new products become available and as new technologies mature Work towards developing a long term support structure for the middleware technology

DOSAR Workshop, Sao Paulo, Brazil, September 16-17, 2005 ARDA The basic middleware development team. Joint European-US team, part of EGEE project, but including participation from VDT.EGEE projectVDT At least one team in each experiment, that takes part in adapting the analysis system of their experiment to use the basic middleware. Providers of common HEP tools, such as POOL, SEAL, ROOT, GANGA and PROOF. POOLSEALROOTGANGA Users within experiments that will provide immediate feedback to the developers.

DOSAR Workshop, Sao Paulo, Brazil, September 16-17, 2005 ARDA (con’t) Service providers from regional centers who will be involved in deploying early versions of the middleware and analysis systems. The participation of teams from other sciences, such as those participating in EGEE, is welcomed.

DOSAR Workshop, Sao Paulo, Brazil, September 16-17, 2005

SW Tier 2 Status Tier 2 Center –ATLAS management selected OU, LU, UT-Arlington, as a Tier 2 Center (Southwest Tier 2 Center) –Collaboration started on grid software development (PanDA) –OCHEP linux cluster will be deployed this year Efforts will be made to increase NSF funding Physics Analysis: OCHEP collaboration will begin on physics topics, building on Tevatron experience –b tagging  tagging –top physics –Higgs/SUSY searches

DOSAR Workshop, Sao Paulo, Brazil, September 16-17, 2005 Production and Distributed Analysis (PanDA)

DOSAR Workshop, Sao Paulo, Brazil, September 16-17, 2005 Questions for Discussion

DOSAR Workshop, Sao Paulo, Brazil, September 16-17, 2005 Questions from Sergio How would we fit in the general structure of LCG? Will DOSAR VO become a distributed Tier 2 center? Which would be our associated Tier 1? Fermilab? What should we do to comply with Atlas and CMS requirements? How will we share our resources between D0 and LHC?

DOSAR Workshop, Sao Paulo, Brazil, September 16-17, 2005 Should DOSAR collaborate with other Tier 2 Centers? CMS Tier 2C? Brazil Tier 2 Federation?

DOSAR Workshop, Sao Paulo, Brazil, September 16-17, 2005 Should DOSAR participate in LCG software development or deployment? Common ATLAS-CMS projects?

DOSAR Workshop, Sao Paulo, Brazil, September 16-17, 2005 Should DOSAR software efforts be part of larger collaborations? OSG proposal? PanDA and DIRAC?

DOSAR Workshop, Sao Paulo, Brazil, September 16-17, 2005 DIRAC- Distributed Infrastructure with Remote Agent Control Services: installed on high availability, centrally managed, servers Agents: installed at various computing centres of institutes associated with the LHCb experiment Clients: available to end users to submit, monitor, and retrieve jobs

DOSAR Workshop, Sao Paulo, Brazil, September 16-17, 2005 DIRAC (con’t) It has been designed to be lightweight, robust, and scalable. This has been achieved by using a service oriented architecture and utilizing existing software for key components: 99% of DIRAC is written in Python, which provides a high performance, object oriented scripting language for rapid development, and maintenance. MySQL database is used for persistency. Services make connections to various DBs to manage job state, monitoring information, and meta-data concerning grid files. Condor ClassAds and Matchmaking are the basis of the scheduling strategy. This makes the best match between an available resource and a queued job. Jabber Instant Messaging has been used to provide asynchronous, real-time, fault-tolerant monitoring and control capabilities to DIRAC Agents, Services, and Jobs.

DOSAR Workshop, Sao Paulo, Brazil, September 16-17, 2005 Action Items To be decided after discussion