Speaker
With a forward look to future evolution, discuss the issues you have encountered (or that you expect) in using the EGEE infrastructure. Wherever possible, point out the experience limitations (both in terms of existing services or missing functionality)
The DIRAC Data Management System has recently been reviewed to allow transfer
requests present on site VOBOXes to be processed using FTS to increase the efficiency
and redundancy of data distribution. This development as well as the systems
mentioned above will be presented here.
Report on the experience (or the proposed activity). It would be very important to mention key services which are essential for the success of your activity on the EGEE infrastructure.
During WLCG’s Service Challenge 3 (2005) the LHC experiments tested their bulk data
transfer frameworks for the distribution of files from CERN to their associated Tier1
sites. LHCb’s Data Management System was interfaced to gLite’s File Transfer Service
(FTS) and showed, during optimal performance, it could meet the requirements of the
Computing Model for data distribution from Tier0. During LHCb’s Data Challenge 2006
the Data Management System components for data driven distribution was used to
transfer over half a million files, using FTS, and their registration in grid
catalogue (LFC). Future developments of the Data Management System will embrace the
new functionality provided by the Storage Resource Manager (SRM) v2.2 implementations
allowing LHCb to fully manage space reservation, pinning and storage classes of its data.
Describe the scientific/technical community and the scientific/technical activity using (planning to use) the EGEE infrastructure. A high-level description is needed (neither a detailed specialist report nor a list of references).
The LHCb experiment being built to utilize CERN’s flagship Large Hadron Collider will
generate data to be analysed by a community of over 600 physicists worldwide. DIRAC,
LHCb’s Workload and Data Management System, facilitates the use of underlying EGEE
Grid resources to generate, process and analyse this data in the distributed
environment. The Data Management System, presented here, provides real time, data
driven distribution in accordance with LHCb’s Computing Model.
Describe the added value of the Grid for the scientific/technical activity you (plan to) do on the Grid. This should include the scale of the activity and of the potential user community and the relevance for other scientific or business applications
The data volumes produced by the LHC experiments are unprecedented, rendering
individual institutes and even countries, unable to provide the computing and storage
resources required to make full use of the produced data. EGEE Grid resources allow
the processing of LHCb data possible in a distributed fashion and LHCb’s Computing
Model is based on this approach. Data Management in this environment requires
reliable and high-throughput transfer of data, homogeneous access to storage
resources and the cataloguing of data replicas, all of which are provided by EGEE
infrastructure and utilized by LHCb.
