CERN Accelerating science

CMS Note
Report number	CMS-CR-2012-124
Title	Distributed error and alarm processing in the CMS data acquisition system
Author(s)	Bauer, Gerry (MIT) ; Behrens, Ulf (DESY) ; Bowen, Matthew (CERN) ; Branson, James (UC, San Diego) ; Bukowiec, Sebastian Czeslaw (CERN) ; Cittolin, Sergio (UC, San Diego) ; Coarasa, J A (CERN) ; Deldicque, Christian (CERN) ; Dobson, Marc (CERN) ; Dupont, Aymeric (CERN) ; Erhan, Samim (UCLA) ; Flossdorf, Alexander (DESY) ; Gigi, Dominique (CERN) ; Glege, Frank (CERN) ; Gomez-Reino, R (CERN) ; Hartl, Christian (CERN) ; Hegeman, Jeroen Guido (Princeton U.) ; Holzner, Andre Georg (UC, San Diego) ; Hwong, Yi Ling (CERN) ; Masetti, Lorenzo (CERN) ; Meijers, Franciscus (CERN) ; Meschi, Emilio (CERN) ; Mommsen, Remigius (Fermilab) ; O'Dell, Vivian (Fermilab) ; Orsini, Luciano (CERN) ; Paus, Christoph Maria Ernst (MIT) ; Petrucci, Andrea (CERN) ; Pieri, Marco (UC, San Diego) ; Polese, Giovanni (CERN) ; Racz, Attila (CERN) ; Raginel, Olivier (MIT) ; Sakulin, Hannes (CERN) ; Sani, Matteo (UC, San Diego) ; Schwick, Christoph (CERN) ; Shpakov, Denis (Fermilab) ; Simon, M (CERN) ; Spataru, Andrei Cristian (CERN) ; Sumorok, Konstanty (MIT)
Publication	2012
Imprint	31 May 2012
Number of pages	14
In:	J. Phys.: Conf. Ser. 396 (2012) pp.012038
In:	Computing in High Energy and Nuclear Physics 2012, New York, NY, USA, 21 - 25 May 2012, pp.012038
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; CMS
Abstract	The error and alarm system for the data acquisition of the Compact Muon Solenoid (CMS) at CERN was successfully used for the physics runs at Large Hadron Collider (LHC) during first three years of activities. Error and alarm processing entails the notification, collection, storing and visualization of all exceptional conditions occurring in the highly distributed CMS online system using a uniform scheme. Alerts and reports are shown on\-line by web application facilities that map them to graphical models of the system as defined by the user. A persistency service keeps a history of all exceptions occurred, allowing subsequent retrieval of user defined time windows of events for later playback or analysis. This paper describes the architecture and the technologies used and deals with operational aspects during the first years of LHC operation. In particular we focus on performance, stability, and integration with the CMS sub\-detectors.
Copyright/License	Preprint: (License: CC-BY-4.0)