NDLI: The data-logging system of the trigger and data acquisition for the ATLAS experiment at CERN

Content Provider	IEEE Xplore Digital Library
Author	Battaglia, A. Beck, H.P. Dobson, M. Gadomski, S. Kordas, K. Vandelli, W.
Copyright Year	2007
Description	Author affiliation: Univ. of Bern, Bern (Battaglia, A.; Beck, H.P.)
Abstract	The ATLAS experiment is getting ready to observe collisions between protons at a centre of mass energy of 14 TeV. These will be the highest energy collisions in a controlled environment to-date, to be provided by the Large Hadron Collider at CERN by mid 2008. The ATLAS Trigger and Data Acquisition (TDAQ) system selects events online in a three level trigger system in order to keep those events promising to unveil new physics at a budgeted rate of ~200 Hz for an event size of ~1.5 MB. This corresponds to a reduction of $O(10^{5})$ from the initial bunch-crossing rate of 40 MHz at nominal operating conditions. This paper focuses on the data-logging system on the TDAQ side, the so-called "Sub-Farm Output" (SFO) system. It takes data from the Event Filter farm, which is the third level trigger, and it streams and indexes the events into different files, according to each event's trigger path. The data files are moved to CASTOR, the central mass storage facility at CERN. The final TDAQ data-logging system has been installed using 6 Linux PCs, holding 24 disks of 500 GB each, managed by three RAID controllers on each PC. The data-writing is managed in a controlled round-robin way among three independent filesystems associated to a distinct set of disks, managed by a distinct RAID controller. This design allows fast I/O, which together with a high speed network permits to minimize the number of SFO nodes. We report here on the functionality and performance requirements on the system, our experience with commissioning it and on the performance achieved,
Starting Page	527
Ending Page	532
File Size	432618
Page Count	6
File Format	PDF
ISBN	9781424409228
ISSN	10957863
DOI	10.1109/NSSMIC.2007.4436385
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-10-26
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Data acquisition Filters Physics Control systems Magnetic separation Helium Laboratories Event detection Detectors Performance analysis Disks Data handling
Content Type	Text
Resource Type	Article

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The Data-Logging System of the Trigger and Data Acquisition for the ATLAS Experiment at CERN

The Data-Logging System of the Trigger and Data Acquisition for the ATLAS Experiment at CERN

Performance of the final data-logging system of the trigger and data acquisition for the ATLAS experiment at CERN

Muon identification with the event filter of the ATLAS experiment at CERN LHC's

Computer modeling the ATLAS Trigger/DAQ system performance

The trigger of the atlas experiment (2003).

Muon identification with the event filter of the ATLAS experiment at CERN LHC

Implementation and performance of the third level muon trigger of the ATLAS experiment at LHC

Multi-Threaded Evolution of the Data-Logging System of the ATLAS Experiment at CERN

The data-logging system of the trigger and data acquisition for the ATLAS experiment at CERN

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