Sep 2 – 9, 2007
Victoria, Canada
Europe/Zurich timezone
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Data Stream handling in the LHCb experiment

Sep 3, 2007, 8:00 AM
10h 10m
Victoria, Canada

Victoria, Canada

Board: 5
poster Online Computing Poster 1


Dr Niko Neufeld (CERN)


Events selected by LHCb's online event filtering farm will be assembled into raw data files of about 2 GBs. Under nominal conditions about 2 such files will be produced per minute. These files must be copied to tape storage and made available online to various calibration and monitoring tasks. The life cycle and state transitions of each files are managed by means of a dedicated data- base. Transfer of the files to permanent storage is using the Data Management System of DIRAC, slightly adapted for the purposes of the Online system. Once files are copied to CERNs mass-storage, replication to the LHCb Tier1 centres is initiated. This system has been designed for extreme robustness and reliability with redundance in almost every component and various failover mechanisms. The software, hardware and protocols designed for this purpose will be discussed in detail. Performance figures of data- challenges done in Spring 2007 will be shown.
Submitted on behalf of Collaboration (ex, BaBar, ATLAS) LHCb Online

Primary author

Dr Niko Neufeld (CERN)

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