CERN Data services for LHC computing

For CHEP

2016 (San Francisco, Oct 2016)

Author(s)

FDO section

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Submission type

TALK

Abstract

Dependability, resilience, adaptability, and efficiency. Growing requirements require tailoring storage services and novel solutions. Unprecedented volumes of data coming from the detectors need to be quickly available in a highly scalable way for large-scale processing and data distribution while in parallel they are routed to tape for long-term archival. These activities are critical for the success of HEP experiments. Nowadays we operate at high incoming throughput (14GB/s during 2015 LHC Pb-Pb run) and with concurrent complex production work-loads. In parallel our systems provide the platform for the continuous user and experiment driven work-loads for large-scale data analysis, including end-user access and sharing. The storage services at CERN cover the needs of our community: EOS and CASTOR as a large-scale storage; CERNBox for end-user access and sharing; Ceph as data back-end for the CERN OpenStack infrastructure, NFS services and S3 functionality; AFS for legacy distributed-file-system services.

In this paper we will summarise the experience in supporting LHC experiments and the transition of our infrastructure from static monolithic systems to flexible components providing a more coherent environment with pluggable protocols, tunable QoS, sharing capabilities and fine grained ACLs management while continuing to guarantee the dependable and robust services.

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