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A Disk-based Archival Storage System Using the EOS Erasure Coding Implementation for the ALICE Experiment at the CERN LHC / Ahn, Sang Un (KISTI, Daejeon) ; Betev, Latchezar (CERN) ; Bonfillou, Eric (CERN) ; Han, Heejune (KISTI, Daejeon) ; Kim, Jeongheon (KISTI, Daejeon) ; Lee, Seung Hee ; Panzer-Steindel, Bernd (CERN) ; Peters, Andreas Joachim (CERN) ; Yoon, Heejun (KISTI, Daejeon)
Korea Institute of Science and Technology Information (KISTI) is a Worldwide LHC Computing Grid (WLCG) Tier-1 center mandated to preserve raw data produced from A Large Ion Collider Experiment (ALICE) experiment using the world’s largest particle accelerator, the Large Hadron Collider (LHC) at European Organization for Nuclear Research (CERN). Physical medium used widely for long-term data preservation is tape, thanks to its reliability and least price per capacity compared to other media such as optical disk, hard disk, and solid-state disk. [...]
2022 - 10 p. - Published in : JISTaP 10 (2022) 56-65 Fulltext: PDF;

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(91)

The first disk-based custodial storage for the ALICE experiment / Un Ahn, Sang (KISTI, Daejeon) ; Kim, Jeongheon (KISTI, Daejeon) ; Han, Heejune (KISTI, Daejeon) ; Lee, Seung Hee (KISTI, Daejeon) ; Yoon, Heejun (KISTI, Daejeon)
We proposed a disk-based custodial storage as an alternative to tape for the ALICE experiment at CERN to preserve its raw data. The proposed storage system relies on Redundant Array of Independent Nodes (RAIN) layout – the implementation of erasure coding in the EOS storage suite, which is developed by CERN – for data protection and takes full advantage of high-density Just-Bunch-Of-Disks (JBOD) enclosures to maximize storage capacity as well as to achieve cost-effectiveness comparable to tape. [...]
2021 - 7 p. - Published in : EPJ Web Conf. 251 (2021) 02051
In : 25th International Conference on Computing in High-Energy and Nuclear Physics (CHEP), Online, Online, 17 - 21 May 2021, pp.02051

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(46)

Seeking an alternative to tape-based custodial storage / Ahn, Sang Un (KISTI, Daejeon) ; Betev, Latchezar (CERN) ; Bonfillou, Eric (CERN) ; Han, Heejune (KISTI, Daejeon) ; Kim, Jeongheon (KISTI, Daejeon) ; Lee, Seung Hee (KISTI, Daejeon) ; Panzer-Steindel, Bernd (CERN) ; Peters, Andreas Joachim (CERN) ; Yoon, Heejun (KISTI, Daejeon)
In November 2018, the KISTI Tier-1 centre started a project to design, develop and deploy a disk-based custodial storage with error rate and reliability compatible with a tape-based storage. This project has been conducted in collaboration with KISTI and CERN; especially the initial design was laid out from the intensive discussion with CERN IT and ALICE. [...]
2020 - 9 p. - Published in : EPJ Web Conf. 245 (2020) 04001 Fulltext from publisher: PDF;
In : 24th International Conference on Computing in High Energy and Nuclear Physics, Adelaide, Australia, 4 - 8 Nov 2019, pp.04001

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(22)

Evaluating CephFS Performance vs. Cost on High-Density Commodity Disk Servers / Peters, Andreas J (CERN) ; van der Ster, Daniel C (CERN)
CephFS is a network filesystem built upon the Reliable Autonomic Distributed Object Store (RADOS). At CERN we have demonstrated its reliability and elasticity while operating several 100-to-1000TB clusters which provide NFS-like storage to infrastructure applications and services. [...]
2021 - 10 p. - Published in : Comput. Softw. Big Sci. 5 (2021) 25 Fulltext: PDF;

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(21)

Evaluating CephFS Performance vs. Cost on High-Density Commodity Disk Servers / van der Ster, Dan (speaker) (CERN)
CephFS is a network filesystem built upon the Reliable Autonomic Distributed Object Store (RADOS). At CERN we have demonstrated its reliability and elasticity while operating several 100-to-1000TB clusters which provide NFS-like storage to infrastructure applications and services. [...]
2021 - 1843. Conferences; 25th International Conference on Computing in High Energy & Nuclear Physics External links: Talk details; Event details In : 25th International Conference on Computing in High Energy & Nuclear Physics

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(21)

The first disk-based custodial storage for the ALICE experiment / Ahn, Sang Un (speaker) (Korea Institute of Science & Technology Information (KR))
We proposed a disk-based custodial storage as an alternative to tape for the ALICE experiment at CERN to preserve its raw data. The proposed storage system relies on RAIN layout -- the implementation of erasure coding in the EOS storage suite, which is developed by CERN -- for data protection and takes full advantage of high-density JBOD enclosures to maximize storage capacity as well as to achieve cost-effectiveness comparable to tape. The system we present provides 18 PB of total raw capacity from the 18 set of high-density JBOD enclosures attached to 9 EOS front-end servers. In order to balance between usable space and data protection, the system will stripe a file into 16 chunks on the 4-parity enabled RAIN layout configured on top of 18 containerized EOS FSTs. Although the reduction rate of available space increases up to $33.3\%$ with this layout, the estimated annual data loss rate drops down to $8.6 \times 10^{-5}\%$. In this paper, we discuss the system architecture of the disk-based custodial storage, 4-parity RAIN layout, deployment automation, and the integration to the ALICE experiment in detail..
2021 - 961. Conferences; 25th International Conference on Computing in High Energy & Nuclear Physics External links: Talk details; Event details In : 25th International Conference on Computing in High Energy & Nuclear Physics

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(17)

Operation status of Custodial Disk Storage for the ALICE experiment / Ahn, Sang Un (speaker) (Korea Institute of Science & Technology Information (KR))
This is going to be a brief presentation regarding the operation status of Custodial Disk Storage (CDS) system provided for the ALICE experiment as a Tape. The CDS system is basically using EOS with its erasure coding implementation (RAIN) for the data protection. [...]
2022 - 848. HEP Computing; EOS workshop External links: Talk details; Event details In : EOS workshop

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(15)

Operation Status of CDS for ALICE experiment / Ahn, Sang Un (speaker) (Korea Institute of Science & Technology Information (KR))
We present the current operation status of CDS (the Disk-based Custodial Storage) for ALICE experiment. The CDS is based on EOS Erasure Coding implementation with four parity mode to match with Tape based archival storage in terms of data protection. [...]
2023 - 1548. HEP Computing; EOS 2023 Workshop External links: Talk details; Event details In : EOS 2023 Workshop

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(13)

Extending DIRAC File Management with Erasure-Coding for efficient storage / Skipsey, Samuel Cadellin (Glasgow U.) ; Todev, Paulin (Glasgow U.) ; Britton, David (Glasgow U.) ; Crooks, David (Glasgow U.) ; Roy, Gareth (Glasgow U.)
The state of the art in Grid style data management is to achieve increased resilience of data via multiple complete replicas of data files across multiple storage endpoints. While this is effective, it is not the most space-efficient approach to resilience, especially when the reliability of individual storage endpoints is sufficiently high that only a few will be inactive at any point in time. [...]
arXiv:1510.09117.- 2015 External link: Preprint
In : 21st International Conference on Computing in High Energy and Nuclear Physics, Okinawa, Japan, 13 - 17 Apr 2015, pp.042051

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Alternative to tape based archive storage project at KISTI / Ahn, Sang Un (speaker) (Korea Institute of Science & Technology Information (KR)) ; Kim, Jeongheon (speaker) (Korea Institute of Science and Technology Information) ; Han, Heejune (speaker) (Korea Institute of Science & Technology Information (KR))
This contribution is about the current status of the project on procurement and deployment of a custodial storage system based on high-density JBOD enclosures with EOS RAIN. System design and considerations, preliminary test results, procurement, installation and basic deployment setup will be presented..
2020 - 787. HEP Computing; EOS workshop External links: Talk details; Event details In : EOS workshop

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