Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 67: Poster Session

HK 67.97: Poster

Thursday, March 19, 2009, 14:00–16:00, Audi-Max

Reliable On-line Storage in the ALICE High-Level Trigger — •Sebastian Kalcher and Volker Lindenstruth — Kirchhoff Institute of Physics, University of Heidelberg, Germany

The on-line disk capacity within large computing clusters such as used in the ALICE High-Level Trigger (HLT) is often not used due to the inherent unreliability of the involved disks. With currently available hard drive capacities the total on-line capacity can be significant when compared to the storage requirements of present high energy physics experiments. In this talk we report on ClusterRAID, a reliable, distributed mass storage system, which allows to harness the (often unused) disk capacities of large cluster installations. The key paradigm of this system is to transform the local hard drive into a reliable device. It provides adjustable fault-tolerance by utilizing sophisticated error-correcting codes. To reduce the costs of coding and decoding operations the use of modern graphics processing units as co-processor has been investigated. Also, the utilization of low overhead, high performance communication networks has been examined. A prototype set up of the system exists within the HLT with 90 TB gross capacity.