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Status GridKa & ALICE T2 in Germany

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kelly-moody
14 diapositives · 399 Views · Oct 31, 2014

Status GridKa & ALICE T2 in Germany. Kilian Schwarz GSI Darmstadt. ALICE T2. Present status Plans and timelines Issues and problems. Status GridKa. Pledged: 600 KSI2k, delivered: 133%, 11% of ALICE jobs (last month). FZK. CERN. GridKa – main issue.

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  1. Status GridKa&ALICE T2in Germany Kilian Schwarz GSI Darmstadt

  2. ALICE T2 • Present status • Plans and timelines • Issues and problems

  3. Status GridKa • Pledged: 600 KSI2k, delivered: 133%, 11% of ALICE jobs (last month) FZK CERN

  4. GridKa – main issue • Resources provided according to megatable • The share among Tier1s comes automatically when considering the Tier2s connecting to this Tier1 … • GridKa pledges 2008: tape 1.5 PB, disk 1 PB • Current megatable: tape 2.2 PB !!!  Much more than pledged, more than all other experiments together, most of the additional demand due to the Russian T2 (0.8 PB) The point is: the money is fixed. In principle switch between tape/disk/cpu should be possible – not on short notice, though. Eventually for 2009 things still can be changed.

  5. CERN ALICE T2 – present status GridKa 150 Mbps Grid 30 TB + 120 ALICE::GSI::SE::xrootd vobox LCG RB/CE GSI Batchfarm (39 nodes/252 cores for ALICE) & GSIAF(14 nodes) Directly attached disk storage (55 TB) ALICE::GSI::SE_tactical ::xrootd PROOF/Batch GSI

  6. Present Status • ALICE::GSI:SE::xrootd • > 30 TB disk on fileserver (8 FS a 4 TB each) • + 120 TB disk on fileserver • 20 fileserver 3U 15*500 GB disks RAID 5 • 6 TB user space per server • Batch Farm/GSIAF and ALICE::GSI::SE_tactical::xrootd nodes dedicated to ALICE: • 15 D-Grid funded boxes: each • 2*2core 2.67 GHz Xeon, 8 GB RAM • 2.1 TB local disk space on 3 disks + system disk Additionally 24 new boxes: each • 2*4core 2.67 GHz Xeon, 16 GB RAM • 2.0 TB local disk space on 4 disks including system

  7. ALICE T2 – short term plans • Extend GSIAF to all 39 nodes • Study coexistence of interactive and batch processes on the same machines. Develop possibility to increase/decrease the number of batch jobs on the fly to give advantage to analysis. • Add newly bought fileservers (about 120 TB disk space) to ALICE::LCG::SE::xrootd

  8. ALICE T2 – medium term plans • Add 25 additional nodes to GSI Batchfarm/GSIAF to be financed via 3rd party project (D-Grid) • Upgrade GSI network connection to 1 Gbs either as dedicated line to GridKa (direct T2 connection to T0 problematic) or as general internet connection

  9. ALICE T2 – ramp up plans http://lcg.web.cern.ch/LCG/C-RRB/MoU/WLCGMoU.pdf

  10. Plans for the Alice Tier 2&3 at GSI: • Remarks: • 2/3 of that capacity is for the tier 2 (ALICE central, fixed via WLCG MoU) • 1/3 for the tier 3 (local usage, may be used via Grid) • according to the Alice computing model no tape for tier2 • tape for tier3 independent of MoU • hi run in October -> upgrade operational: 3Q each year

  11. ALICE T2/T3 • Language definition according to GSI interpretation: • ALICE T2: central use • ALICE T3: local use. Resources may be used via Grid. But no pledged resources. • remarks related to ALICE T2/3: • At T2 centres are the Physicists who know what they are doing • Analysis can be prototyped in a fast way with the experts close by • GSI requires flexibility for optimising the ratio of calibration/analysis & simulation at tier2/3

  12. data transfers CERN GSI • motivation: calibration modell and algorithms need to be tested before October • test the functionality of current T0/T1  T2 transfer methods. • At GSI the CPU and storage resources are available, but how do we bring the data here ?

  13. data transfer CERN GSI • The system is not ready yet for generic use. Therefore expert control by a „mirror master“@CERN is necessary. • In principle: individual file transfer works fine, now. Plan: next transfers with Pablos new collections based commands. Webpage where transfer requests can be entered and transfer status can be followed up. • So far about 700 ROOT files have been successfully transfered. This corresponds to about 1 TB of data. • 30% of the newest request still pending. • Maximum speed achieved so far: 15 MB/s (almost complete bandwidth of GSI), but only during a relatively short time • Since August 8 no relevant transfers anymore. Reasons: • August 8, pending xrootd update at Castor SE • August 14, GSI SE failure due to network problems • August 20, instability of central AliEn services. Production comes first -- Up to recently: AliEn update • GSI plans to analyse the transferred data ASAP and to continue with more transfers. Also PDC data need to be transferred for prototyping and testing of analysis code.

  14. data transfer CERN GSI