Forschungszentrum Karlsruhe in der Helmholtz - Gemeinschaft. Holger Marten. Holger. Marten at iwr. fzk. de
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1 Tier-2 cloud Holger Marten Holger. Marten at iwr. fzk. de 1
2 GridKa associated Tier-2 sites spread over 3 EGEE regions. (4 LHC Experiments, 5 (soon: 6) countries, >20 T2 sites) 2
3 region DECH LHCb 0 SI2k 100 CMS Atlas Alice 3
4 atlas alice cms lhcb GridKa 4
5 Tier-2s associated with GridKa (The WLCG GridKa cloud ) Name Location Alice Atlas CMS LHCb CH / CSCS Manno X X X Czech R./FZU Prague X X D / DESY DESY Hamburg + X Zeuthen D / CMS-Fed. DESY Hamburg + X Zeuthen, RWTH Aachen D / GSI GSI Darmstadt X D / Atlas-Fed. Munich MPG + TU X Polish Tier-2 Federation Cracow, Poznan, Warsaw RU / RDIG Federation (8+?) X Candidates: Austria Innsbruck, Vienna X D / U Münster Münster X D/ U Freiburg Freiburg X X X X 5
6 Tested FTS channels GridKa Tier-0 / 1 / 2 (not sure that this is up to date) Tier-0 FZK CERN - FZK FZK Tier-1 IN2P3 - FZK PIC - FZK RAL - FZK SARA - FZK TAIWAN - FZK TRIUMF - FZK BNL - FZK FNAL - FZK INFNT1 - FZK NDGFT1 - FZK FZK Tier-2 FZK Tier-2 (cont.) FZK - CSCS FZK - TROITSKINR FZK - CYFRONET FZK - UNIFREIBURG U FZK - DESY FZK - UNIWUPPERTAL FZK - DESYZN FZK - WARSAW FZK - FZU FZK - GSI FZK - ITEP FZK - IHEP FZK - JINR FZK - PNPI FZK - POZNAN FZK - PRAGUE FZK - RRCKI FZK - RWTHAACHEN FZK - SINP FZK - SPBSU 6
7 Non-associated Tier-2s accessing data at GridKa (taken from the Megatable) 9 European sites 7US U.S. sites 5 from far East + 3 additional candidates all CMS (see CMS computing model) They will be served through FTS STAR-channels. 7
8 Transfer rates for GridKa according to Megatable T0 T MB/s 10 Gbps dedicated GridKa CERN + 10 Gbps GridKa CNAF failover T1 T1 in MB/s T1 T1 out MB/s 10 Gbps GridKa CNAF 10 Gbps GridKa SARA/NIKHEF 10 Gbps GridKa IN2P3 T2 T1 84,4 MB/s average MB/s peak 10 Gbps GridKa Internet T1 T MB/s average 1 Gbps GridKa Poland 1 Gbps GridKa Czech R MB/s peak Is that correct? D/CMS gives 8 MB/s average but 202 MB/s peak! Disk and Tape requirement for GridKa acc. to Magatable is o.k. (balance slightly positive) 8
9 Deployed services for Tier-2s usual T1 site services (CEs, SE, BDIIs, VO-Boxes ) top level BDII RB FTS (see overview of tested channels) 3D Oracle & Squid data bases deployed (3rd machine for Atlas soon) LFC (yet MySQL, to be migrated to Oracle DB But not always sure about usage of RB, top level BDII, by other sites. General trends at GridKa to virtualize services on redundant + reliable hardware run DNS round-robin for load balancing 9
10 Examples from the last Service Challenges 10
11 Data transfers November 2006 Hourly averaged dcache I/O rates and tape transfer rates achieved 477 MB/s peak (1hour average) data rate. >440 MB/s during 8 hours (T0 T1 + T1 T1) > 200 MB/s to tape achieved with 8 LTO3 drives. Higher tape throughput already in October
12 Gridview i T0 FZK Plots for Nov th 15th high CMS transfer rates > 200 MB/s 12
13 Multi-VO transfers December 06 Target: Alice 24MB/s, Atlas 83.3 MB/s, CMS 26.3 MB/s SUM: 134 MB/s CMS disk-only pools at FZK full. LFC down FTS failed RED = ATLAS It s possible but still needs reliability as everywhere 13
14 Atlas DDM tests: Tier-1 + Tier-2 cloud Participating Tier-2s: DESY-HH, DESY-ZN, Wuppertal, FZU, CSCS, Cyfronet 3 steps functional tests: 1. 1 dataset subscribed to each Tier-2 + one add. dataset to all Tier-2s 100% files transferred 2. 2d datasets t to each htier-2 Problem w/ Atlas VO at Wuppertal, few replication failures dataset in each Tier-2 subscribed to GridKa 100% files transferred. Parallel subscription of datasets (few 100 GBs) to all Tier-2s. (Dec. 06) Throughphut tests to be done! 14
15 CMS T2 Desy-Aachen Federation significant contributions to CMS SC4 and CSA06 challenges stable data transfers transferred 55 TB to DESY/Aachen disk within 45 days, 45 TB to DESY tape Aachen CMS muon and computing groups successfully demonstrated full grid-chain from data taking at T0 to user analysis at T2 for the first time. 14% of total CMS grid MC production 2007/2008: MC prod. / Calib. in Aachen, MC prod. and user analysis at Desy Significant upgrade of resources Further improve cooperation between German CMS centers (including Uni KA and GridKa) 15
16 Polish Federated d Tier-2 3 computing centres, each supporting mainly one experiment: Kraków - Atlas, LHCb Warsaw - CMS, LHCb connected via Pionier academic network Poznań - Alice 1Gb/s p2p network link to GridKa in place successful participation in Atlas SC4 T1 T2 tests: - Up to 100 MB/s transfer rates from Krakow to GridKa, 50% slower in other direction % file transfer efficiency 1000 ksi2k CPU and 250 TB disk will be provided d by Polish Tier-2 2Federation at LHC startup. 16
17 Successfull participation in Atlas DDM tests! FZU Prague nr.of jobs # CPU equivalent Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov 0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Nr. of ATLAS jobs submitted to Golias CPU equivalent usage average number of CPUs used continuously 17
18 The GridKa cloud - How do we communicate (examples) dedicated Tier-2 and experiment contact at GridKa (A. Heiss) GridKa Tier-2 meeting in Munich in Oct GridKa contrib. to Polish federation meeting in Feb German Tier-2 representative in GDB Tier-2 participation in face-to-face meetings of GridKa TAB several experiment specific meetings with Tier-2 participation 18
19 GridKa upgrades
20 Upgrades in 2007 Install additional CPUs (April) LHC experiments: 1027 ksi2k ksi2k = 1864 ksi2k non-lhc experiments: 1060 ksi2k ksi2k = 1270 ksi2k Completed on Monday, April 2nd Add tape capacity (April) LHC experiments: 393 TB TB = 1007 TB non-lhc experiments: 545 TB + 40 TB = 585 TB Completed but needs some hardware maintenance for new drives Add disk capacity (July) LHC experiments: 284 TB TB = 878 TB (usable) Non-LHC experiments 353 TB + 90 TB = 443 TB (usable) 2007: LHC experiments will Installation / allocation started have biggest fraction of the GridKa resources! 20
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