Speaker
Andrew Cameron Smith
(CERN)
Description
The LHCb Computing Model describes the dataflow model for all stages in the
processing of real and simulated events and defines the role of LHCb associated Tier1
and Tier2 computing centres. The WLCG ‘dressed rehearsal’ exercise aims to allow LHC
experiments to deploy the full chain of their Computing Models, making use of all
underlying WLCG services and resources, in preparation for real data taking. During
this exercise simulated RAW physics data, matching the properties of eventual real
data, will be uploaded from the LHCb Online storage system to Grid enabled storage.
This data will then be replicated to LHCb Tier1s and subsequently processed
(reconstructed and stripped). The product of this processing is user analysis data
that are distributed to all LHCb Tier1 sites. DIRAC, LHCb’s Workload and Data
Management System, supports the implementation of the Computing Model in a data
driven, real time and coordinated fashion.
In this paper the LHCb Computing Model will be reviewed and the DIRAC components
providing the needed functionality to support the Computing Model will be detailed.
The experience gained during WLCG's 'dressed rehearsal' exercise will be given along
with an evaluation of the preparedness for real data taking.
Author
Andrew Cameron Smith
(CERN)
