Speaker
Marco Clemencic
(European Organization for Nuclear Research (CERN))
Description
The LHCb Conditions Database project provides the necessary tools to handle non-event
time-varying data. The main users of conditions are reconstruction and analysis
processes, which are running on the Grid. To allow efficient access to the data, we
need to use a synchronized replica of the content of the database located at the same
site as the event data file, i.e. the LHCb Tier1. The replica to be accessed is
selected from information stored on LFC (LCG File Catalog) and managed with the
interface provided by the LCG developed library CORAL. The way we limit the
submission of jobs to those sites where the required conditions are available will
also be presented.
LHCb applications are using the Conditions Database framework on a production basis
since March 2007. We have been able to collect statistics on the performances and
effectiveness of both the LCG library COOL (the library providing conditions handling
functionalities) and the distribution framework itself. Stress tests on the CNAF
hosted replica of the Conditions Database have been performed and the result will be
summarized here.
Author
Marco Clemencic
(European Organization for Nuclear Research (CERN))
