Speaker
Prof.
Jesus Marco
(IFCA (CSIC-UC) Santander Spain)
Description
The strategy at the end of the LEP era for the long term
preservation of physics results and data processing framework
was not obvious.
One of the possibilities analyzed at the time, previously to the
generalization of virtualization techniques, was the setup of
a dedicated farm, to be conserved in its original state for
medium-long term, at least until the new data from LHC could
indicate the need to reanalyze LEP data, the most significant
example being the Higgs boson search.
Such an infrastructure was setup at IFCA in 2001, including 80
equal servers where the software of the DELPHI experiment
was installed and tested, and analysis ntuples and code were stored.
This set of servers have been periodically restarted and tested,
to examine the feasibility of this approach for complete preservation,
and allow a detailed comparison with the approach based on the use
of virtual machines.
In parallel, all DELPHI data at DST (Data Summary Tapes) level were copied to IFCA and stored in tape in LTO-1 format.
The latest results at LHC indicate that there will be likely no need to
reanalyze LEP data.
This contribution describes this experience, the results obtained
after more than 10 years of "freezing", and concludes with the lessons
learnt in this cycle across two generation of experiments.
Primary author
Mr
Rafael Marco De Lucas
(IFCA (CSIC-UC) Santander SPAIN)
Co-authors
Dr
David Rodriguez
(IFCA (CSIC-UC) (now at University of Edinburgh))
Prof.
Jesus Marco
(IFCA (CSIC-UC) Santander Spain)
Mr
Miguel Angel Nuñez
(IFCA (CSIC-UC), Santander SPAIN)
