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안상언,한희준,Eric Bonfillou,Latchezar Betev,김정헌,이승희,Bernd Panzer-Steindel,Andreas-Joachim Peters,윤희준 한국과학기술정보연구원 2022 Journal of Information Science Theory and Practice Vol.10 No.-
Korea Institute of Science and Technology Information (KISTI) is a Worldwide LHC Computing Grid (WLCG) Tier-1 center mandated to preserve raw dataproduced from A Large Ion Collider Experiment (ALICE) experiment using the world’s largest particle accelerator, the Large Hadron Collider (LHC) atEuropean Organization for Nuclear Research (CERN). Physical medium used widely for long-term data preservation is tape, thanks to its reliability andleast price per capacity compared to other media such as optical disk, hard disk, and solid-state disk. However, decreasing numbers of manufacturersfor both tape drives and cartridges, and patent disputes among them escalated risk of market. As alternative to tape-based data preservation strategy,we proposed disk-only erasure-coded archival storage system, Custodial Disk Storage (CDS), powered by Exascale Open Storage (EOS), an open-sourcestorage management software developed by CERN. CDS system consists of 18 high density Just-Bunch-Of-Disks (JBOD) enclosures attached to 9 serversthrough 12 Gbps Serial Attached SCSI (SAS) Host Bus Adapter (HBA) interfaces via multiple paths for redundancy and multiplexing. For data protection,we introduced Reed-Solomon (RS) (16, 4) Erasure Coding (EC) layout, where the number of data and parity blocks are 12 and 4 respectively, which givesthe annual data loss probability equivalent to 5×10-14. In this paper, we discuss CDS system design based on JBOD products, performance limitations, anddata protection strategy accommodating EOS EC implementation. We present CDS operations for ALICE experiment and long-term power consumptionmeasurement.
NA49 Collaboration,Alt, C.,Anticic, T.,Baatar, B.,Barna, D.,Bartke, J.,Betev, L.,BiaBkowska, H.,Blume, C.,Boimska, B.,Botje, M.,Bracinik, J.,Buni, P.,Cerny, V.,Christakoglou, P.,Chung, P.,Chvala, O.,C North-Holland Pub. Co 2010 Physics letters: B Vol.685 No.1
Source imaging methodology is used to provide a three-dimensional two-pion source function for mid-rapidity pion pairs with p<SUB>T</SUB><70 MeV/c in central (0-7%) Pb + Pb collisions at s<SUB>NN</SUB>=17.3 GeV. Prominent non-Gaussian tails are observed in the pion pair transverse momentum (outward) and in the beam (longitudinal) directions. Model calculations reproduce them with the assumption of Bjorken longitudinal boost invariance and transverse flow blast-wave dynamics; they also yield a proper time for breakup and emission duration for the pion source.