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OPAL Data Preservation. Matthias Schröder, CERN. LEP. Large Electron Positron Collider Four general purpose experiments ALEPH, DELPHI, L3, OPAL Varying detector layouts Varying data structures Varying software approaches Optimization Personal preferences Data taking: 1989 – 2000

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Opal data preservation

OPAL Data Preservation

Matthias Schröder, CERN


LEP

  • Large Electron Positron Collider

  • Four general purpose experiments

    • ALEPH, DELPHI, L3, OPAL

    • Varying detector layouts

    • Varying data structures

    • Varying software approaches

      • Optimization

      • Personal preferences

  • Data taking: 1989 – 2000

    • ‘89 to ‘95: at and around Z-peak (91 GeV)

    • ‘95 to ‘00 increase in various steps up to 209 GeV

OPAL Data Preservation - Matthias Schröder


Opal data
OPAL Data

  • Type:

    Raw Data

    Reconstructed + Raw

    Compressed Reconstructed + some Raw

    Compressed Reconstructed (Monte Carlo only)

    Ntuples

    Calibration + Conditions

  • Format:

    Zebra

  • Medium:

    Optical Disks (raw data only)

    Tape (everything, except most Ntuples)

OPAL Data Preservation - Matthias Schröder


Catalogs
Catalogs

  • For raw data optical disks: ?

  • All data (except most Ntuples): castor

  • Some History / metadata: fatmen

OPAL Data Preservation - Matthias Schröder


Documentation
Documentation

  • Primer

    • Introduction for newcomers

  • Technical Notes

  • Publications

  • All Latex

OPAL Data Preservation - Matthias Schröder


Software
Software

  • F77

  • Relies heavily on CERNLIB

  • Reconstruction packages in archive

    • Ported to actual SLC

    • Validation minimal

  • Calibration SW, workgroup and private code dispersed

  • Tools

  • Future of Fortran compiler is a worry

OPAL Data Preservation - Matthias Schröder


To do i
To Do (I)

  • Data

    • Copy off site

    • Create catalog outside castor

    • Extract info from fatmen database

    • Check completeness

    • Recreate lost data sets

OPAL Data Preservation - Matthias Schröder


To do ii
To Do (II)

  • Documentation

    • Validate Primer

    • Move docs to archive

  • Software

    • Keep adapting to new OS versions

      • Ok to adapt to more picky compiler

      • Can we cope with compiler dropping features

    • Validation suite needed

    • Image full reconstruction environment?

OPAL Data Preservation - Matthias Schröder


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