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The LHCb experiment at CERN uses a server farm to filter the events consisting of up to 4400 cores, which receives events at a rate of 1MHz and filters them with a trigger application that has an output of around 2 kHz. Configuring and starting 0(5000) instances of a very large trigger application, each consisting of hundreds of shared libraries is a formidable task and for the efficient operation...
The High Level Trigger (HLT) and Data Acquisition System select about 2 kHz of events out of the 40 MHz of beam crossings. The selected events are consolidated into files on an onsite storage and then sent to permanent storage for subsequent analysis on the Grid. For local and full-chain tests a method to exercise the data-flow through the HLT when there are no actual data needed. In order to test...
The LHCb experiment is a hadronic precision experiment at the LHC accelerator aimed at mainly studying b-physics by profiting from the large b-anti-b-production at LHC. The challenge of high trigger efficiency has driven the choice of a readout architecture allowing the main event filtering to be performed by a software trigger with access to all detector information on a processing farm based on...
This document describes the architecture of the LHCb storage system, and discusses the key criteria which formed the basis of the evaluation of the system. The configuration of the current solution and its capabilities are also described, accompanied by performance figures.
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