by Sang Un Ahn . Published: 28 June 2015

On 21st May 2015, the Korean Tier-1 centre, KISTI-GSDC (Korea Institute of Science & Technology Information - Global Science experimental Data hub Centre), completed the upgrade of the bandwidth of its optical fibre link reaching CERN up to 10 Gbps; that is included in the LHC Optical Private Network (OPN) which is used for fast data replication from CERN Tier-0 to Tier-1s in the Woldwide LHC Computing Grid (WLCG).

KISTI-GSDC was approved as a full Tier-1 at 24th WLCG Overview Board in November 2013 with the appreciation from ALICE community of the effort to sustain the site reliable and the contribution to computing resources for the experiment. Although KISTI-GSDC provided a dedicated connection to CERN with the bandwidth below the requirement by the time it was promoted, its roadmap for upgrading the bandwidth was accepted.

According to the roadmap for the bandwidth upgrade on OPN link between KISTI and CERN, it was originally proposed to accomplish by October 2014. However, after the in-depth revision of the executive plan with the funding agency (MSIP) to find out the best cost-effective way, the upgrading process was started at the end of February this year and finally done just before the LHC RUN2 scheduled to be started in May 2015.

The OPN link between KISTI and CERN is composed of two sections: Daejeon-Chicago (operated by KISTI) and Chicago-Geneva (operated by SURFnet). An additional line to be switched in case some intervention is required essentially complements the link. The yearly budget to sustain the link is about 1.1 MCHF.