NDLI: The Monitoring Data Archiving Service for ATLAS

Content Provider	IEEE Xplore Digital Library
Author	Zema, P.F.
Copyright Year	2006
Description	Author affiliation: CERN, Geneva (Zema, P.F.)
Abstract	ATLAS is one the four experiments being assembled at the CERN Large Hadron Collider (LHC). The complexity of the ATLAS experiment and the high event rate make the monitoring system an essential tool to assess the status of the hardware and the quality of the data while they are being acquired. It is important that all the monitoring data, mainly ROOT histograms, are saved to a permanent storage system, so that they can be used later for studying the time evolution of the experimental conditions or as reference for the future runs. The presentation will show the solution proposed to this issue within the ATLAS Trigger and Data Acquisition (TDAQ) project. Many GB of monitoring data are expected per run. At the end of each run, the Monitoring Data Archiving service (MDA) retrieves all the available histograms from the Online Histogramming service (a temporary storage provided within the ATLAS TDAQ software framework) and writes them into ROOT files, which in turn will be stored on tapes. The Collection and Cache service (CoCa) manages a disk based cache in order to guarantee a fast access to the histograms produced during the last runs. Furthermore, it collects many small files and produces big archives to be stored on tape, thus enhancing the efficiency in the tape usage. Initially meant as a component of MDA, CoCa has evolved as an independent package that can be used by any ATLAS online application.
Starting Page	12
Ending Page	19
File Size	253367
Page Count	8
File Format	PDF
ISBN	1424405602
ISSN	10957863
DOI	10.1109/NSSMIC.2006.356100
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-10-29
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Monitoring Large Hadron Collider Detectors Assembly Histograms Data acquisition Mesons Spectroscopy Event detection Hardware archiver ATLAS TDAQ DAQ online monitoring storage archiving
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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