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DDM Ops User Feedback

DDM Ops User Feedback. Hong Ma BNL ATLAS DDM Workshop Jan 29,2007. Typical Uses of DDM. Validation Quick access to data from production Access to ESD/AOD datasets, validate the software/performance Or, be able to run reconstruction on RDOs Performance studies

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DDM Ops User Feedback

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  1. DDM Ops User Feedback Hong Ma BNL ATLAS DDM Workshop Jan 29,2007

  2. Typical Uses of DDM • Validation • Quick access to data from production • Access to ESD/AOD datasets, validate the software/performance • Or, be able to run reconstruction on RDOs • Performance studies • Running reconstructions on RDOs • Private code, development releases • Need to have access to RDO datasets • Physics Analysis • Proocessing large number of AOD datasets • Access to AODs • Either copy AODs, or run distributed analysis • Commissioning analysis • Access to commissioning data from detector • Some calibration data are also in DDM. SM Meeting, Hong Ma

  3. Experiences • Great effort to make the calibrations samples RDO available in BNL and Lyon • See Claire’s talk in Nov, stress test of the system, largely a success • Reconstruction benefited from the availability of the data • 12.0.4 AOD datasets were not promptly accessible for validation • Difficulty of accessing data does not match validation needs • Coupled to Production System • Dataset subscription • Very useful for dataset distribution • Some subscriptions halt in the middle • Requires too many expert intervention • Subscription before consolidation does not work well • Hard to figure out which site actually has the data • No distinction for the primary data source • Subscription to a “good” source works better, but hard to know which one is good. • Ideally user would like the system to figure out the best way to get the data • dq2 client tool (dq2_get, etc) • Very useful and essential, good documentation • Site specific instruction is very useful. SM Meeting, Hong Ma

  4. CSC11 AODs at BNL • We subscribed many CSC11 AOD datasets for BNL • Submitted tickets for some of the problems, but did not follow all. • Need to do better than this for csc12. SM Meeting, Hong Ma

  5. Outlook • We aim to support large physics analysis community at BNL • Data accessibility is always a hot issue • Past: Copy data by experts (DC2/Rome) Using DQ2 Subscription+Complaints (csc11) • Future: data come to us automatically? • csc12 AOD availability is essential for CSC studies • DDM Op’s plan of AOD replication to Tier-1 seems sound • Monitoring the data transfer, don’t wait for users’ complaint. • Expect subscriptions of other datasets (ESDs and RDOs) • Many of the SampleA RDOs • Support is greatly appreciated • Thanks for help. SM Meeting, Hong Ma

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