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Status of Tier-1 @ GSDC, KISTI

Status of Tier-1 @ GSDC, KISTI. Sang-Un Ahn , for the GSDC Tier-1 Team sahn@kisti.re.kr. GSDC Tier-1 Team. News. Nov. 2012: EMI-2 middleware migration done End of support to gLite 3.2: decommissioned by 30 Nov 2012 End of support to EMI-1: decommissioned by 30 Apr 2013

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Status of Tier-1 @ GSDC, KISTI

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  1. Status of Tier-1 @ GSDC, KISTI Sang-Un Ahn, for the GSDC Tier-1 Team sahn@kisti.re.kr

  2. GSDC Tier-1 Team 13th CERN-Korea Committee

  3. News • Nov. 2012: EMI-2 middleware migration done • End of support to gLite 3.2: decommissioned by 30 Nov 2012 • End of support to EMI-1: decommissioned by 30 Apr 2013 • OS upgrade: Scientific Linux 6 • Some component, e.g. VOBOX, is still glite-3.2 and remaining on SL5 (In a few weeks, new release will be deployed) • Dec. 2012: Tape system installation complete • IBM TS3500 • Dual Caches: Xrootd, GPFS (High Availability) • Mar. 2013: start of p-Pb collision data migration to KISTI • 310 TB with 400k files 13th CERN-Korea Committee

  4. Resource • 1512 cores (63 WNs * 24 cores) with 3GB memory/core • 1 PB Disk space • Old SE(100TB) will be decommissioned(test-bed, maintenance difficulties) • Migration is on-going (to ALICE::KISTI_GSDC::SE2): ~60% done • 1 PB Tape space for data archiving • 8 tape drives (total 2GB/s throughput) with 260 media (4 TB per medium) • For cache, • 200 TB xrootd pool • 275 TB GPFS pool 13th CERN-Korea Committee

  5. Operation • Concurrent job capacity: 1512 • Last 3 months average: 1328 (~ 88% of job capacity) • Requirement: 85% of job capacity at least for 2 months • Announced shutdown for maintenance, no critical outage • Correlation with production/user job activities, central services • Mass MC production/reconstruction, Holidays, Weekends Backbone Network Maintenance 13th CERN-Korea Committee

  6. Site Availability/Reliability • WLCG SAM project: • Service Availability Monitoring framework • Dispatch probes corresponding each service (CE, SE, WN, etc.) • Target: 97% • Definition: • Monthly report by WLCG for VOs • OPS, ALICE, ATLAS, CMS, LHCb … • Since Feb 2013, ALICE probe has been dispatched to KISTI • Requirement: Running of the reliability tests (both OPS and ALICE-specific) and publishing those to the new SAM infrastructure 13th CERN-Korea Committee

  7. 2013 p-Pb RAW replication • p-Pb data transfer started on 7th March • Passed periodic functional test by ALICE (100% availability after tape configuration) • Requirement: 90% Storage Element availability (functional tests) for at least 2 months • Total data size: 309.9 TB (400k files are in queue) • 39runs done + 8 runs running out of 177 runs (14th Apr) : ~100k files w/ 80 TB (26% of tatal) • Optimization of the policy (migrate/purge) for xrootd and GPFS is in progress • Transfer speed: 24MB/s on average, 379MB/s on peak • Requirement: High speed transfer of data from CERN to KISTI at the speed required to receive and archive 10% of the ALICE AA raw data foreseen for 2012 over a continuous period of 2 weeks • Effort to improve the network performance in on-going together with KISTI network expert 30MB/s 20MB/s 11 Apr 2013 03 Mar 2013 13th CERN-Korea Committee

  8. Network • Currently 1Gbps (dedicated) bandwidth between CERN-KISTI is now being fully used • Requirement: 3Gbps or higher bandwidth to join LHC OPN • In May 2013, dedicated 2Gbps link will be deployed: • Connection: GLORIAD-KR – NLR* - SURFnet - CERN • Before: (1Gbps) GLORIAD-KR – CAnet, CANARIE – SURFnet - CERN • With 2Gbps, discussion among network experts (KISTI-CERN) to join LHC OPN will soon be started * National LambdaRail(U.S.) 13th CERN-Korea Committee

  9. Pledged • Pledged resources • Based on WLCG & ALICE CollaborationMoU • Meeting ALICE requirement by 2013 13th CERN-Korea Committee

  10. Milestones (Summary of Requirements) • Remaining requirements: plans for • Improving network bandwidth/performance and joining LHC OPN • Establishing a system to support Tier-1 services in 24/7 13th CERN-Korea Committee

  11. Conclusion • KISTI-GSDC has been demonstrating WLCG Tier-1 for ALICE experiment following the proposed plan • Full sets of p-Pb collision data is being replicated to KISTI tape storage • Heavy activities to reconstruct them are foreseen as well as that of exploiting them • In May, dedicated 2Gbps bandwidthwill be establishedbetween CERN and KISTI, and discussion to join OPN will be started • Target date for qualification of Tier-1: Oct. 2013 (the next WLCG Overview Board) 13th CERN-Korea Committee

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