Last update:
Apr 1, 2000
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Status Report of the RD45 Project
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RD45 Collaboration
See http://wwwinfo.cern.ch/asd/rd45/reports/sr_99/status_report99.html for a list
Speaker:
Jamie Shiers
Since 1995, the RD45 project has been investigating solutions to the problem of
providing persistency to the physics data of the LHC experiments, assumed to be in the form of
(collections of) objects. At the end of the first year, a potential solution, based on
standards-conforming products, was presented. During the second year, this possible solution was
studied further – performance comparisons with existing systems and tests of functionality and
scalability were carried out and production demonstrations were made. These results were presented
at CHEP ’95 and CHEP ’97 respectively.
During the past 18 months, production services have been offered, based on a
combination of the two most promising commercial products identified in the first stage of the
project, namely Objectivity/DB and HPSS. These tools, together with a small amount of HEP-specific
code, are now distributed via LHC++. In parallel, research has continued on a number of critical
issues identified by the experiments, such as the integration of mass storage systems, the use of
an ODBMS in the wide-area and clustering / re-clustering issues. In addition, an in-depth risk
analysis has been performed.
In this report, we summarise the activities of the RD45 project since the last review
by the LCB in April 1998. We report on progress on the milestones set by the LCB, experience with
experiments such as BaBar, COMPASS and NA45, the on-going risk analysis and make suggestions
concerning possible future activities, primarily related to the LHCC milestone for a “choice of
ODBMS” for ATLAS and CMS in 2001.
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