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QCDgrid status report

QCDgrid status report. UKQCD data grid Chris Maynard. QCDgrid outline . QCDgrid is primarily a data grid Store data online (disk) Security through redundancy Multiple copies of files in geographically distinct locations

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QCDgrid status report

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  1. QCDgrid status report UKQCD data grid Chris Maynard QCDgrid

  2. QCDgrid outline • QCDgrid is primarily a data grid • Store data online (disk) • Security through redundancy • Multiple copies of files in geographically distinct locations • Replica catalogue service (RC) links copies to logical file name (LFN) • Data access through metadata catalogue service (MC) • Configurations marked up in QCDml1.1 QCDgrid

  3. Machines – LHC terminology • Tier 1 system • 50TByte SAN system • QCDOC front end directly connected • Hold one copy of all UKQCD data • Machine exists, not yet part of grid • Tier 2 systems • Edinburgh, Liverpool, Southampton, Swansea • Linux server + RAID array disk • Now: 5 TByte. Upgrade to12.5 TByte • 50 TByte capacity + 50 TByte replicated QCDgrid

  4. Software • Middleware: Globus 2.4 • RC: Globus RC • MC: Native XML database eXist • Bespoke Control Thread (CT) • Command line client tools • GUI client tools • Metadata browser • Based on OGSA-DIA browser • Job submission tool QCDgrid

  5. Control Thread QCDgrid

  6. Command line tools • For grid administrator • Add/remove machine • Disable/enable machine • Add/remove users (see later) • Remove Data • For user • Add, retrieve, store locally, data • Job submission post-production on grid data • Remote machine not required to be QCDgrid QCDgrid

  7. QCDgrid GUI • Same functionality as command line • Metadata browser • Search and read metadata • Based on OGSA-DIA browser • Freely available from qcdgrid.forge.nesc.ac.uk • Undergoing modification to take account of split schema in QCDml • Demonstration • Can read MC without authentificaton QCDgrid

  8. MC Browser and QCDml • QCDml1.1 • Two schemata • Configuration XML • Ensemble XML • MD catalogue and browser being modified • QCDml split is logical split • Nearly always search on Ensembles not • Native XML database has few ensemble files • Relational DB good, Hierarchical DB Bad • Quick searching! QCDgrid

  9. Ensemble • Look for actions • Couplings • Volumes • Can then examine individual config XML QCDgrid

  10. Config XML • Can search and display for an individual config XML QCDgrid

  11. Download data • Can download data using GUI • Or extract markovChainLFN • Download data later from script for interactive job QCDgrid

  12. Authenticated access • QCDgrid data access • X509 certificate from trusted CA • Currently only UK e-Science CA • We can trust your CA! • QCDgrid is not closed • Not anonymous, but authenticated access. • ILDG data sharing • Technically could move to anonymous access • Require data sharing policy from ILDG board QCDgrid

  13. QCDgrid and ILDG • ILDG RC services are SRM • QCDgrid RC catalogue published as SRM • This is not yet implemented • QCDgrid will appear as single ILDG node • ILDG MD services • UKQCD configurations marked up in QCDml1.1 • MC catalogue public anonymous access • Aggregate to obtain ILDG MC QCDgrid

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