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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 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 • 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 • For raw data optical disks: ? • All data (except most Ntuples): castor • Some History / metadata: fatmen OPAL Data Preservation - Matthias Schröder
Documentation • Primer • Introduction for newcomers • Technical Notes • Publications • All Latex OPAL Data Preservation - Matthias Schröder
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) • 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) • 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