Atlas:SC4

Bienvenue sur la page Atlas SC4 LCG-France

Welcome to the LCG-France Atlas SC4 page

Twiki page : SC4 ATLAS

Compte rendu de la réunion SC4 ATLAS au CERN du 9 Juin (S.Jézéquel, G. Rahal) (written in french)

• T0 Role(CERN)
  • Produce dummy files with 1 to 2 GB size(RAW, ESD et AOD) (see T0 Twiki)
  • Initiate T0->T1 transfers
  • FTS server sents files to Lyon choosing between 'TAPE' (RAW 43,2 Mo/s) or 'DISK' (ESD,AOD 23+20 Mo/s) areas
• T1 Role (CCIN2P3)
  • Get files from T0 (dedicated dcache area: L. Schwarz)
  • Provides LFC (lfc-atlas.in2p3.fr) and FTS service (cclcgftsli01.in2p3.fr) (D. Bouvet)
  • Send all AODs to each T2 (20 Mo/s) using Lyon FTS server
  • Regurlarly cleanup files
• T2 Role (BEIJING, LAL, LAPP, LPC, LPNHE, SACLAY, TOKYO)
  • Get files from T1 (Lyon). Files on the T2 are written in /home/atlas/sc4tier0/...
  • Clean-up the files (?)
• Other roles
  • ATLAS (S. Jézéquel, G. Rahal) : Initiate T1->T2 transfers

Information from DDM monitoring

• Main DDM monitoring page

• http://atlas-ddm-monitoring.web.cern.ch/atlas-ddm-monitoring/rrd/plots/stack4h.png http://atlas-ddm-monitoring.web.cern.ch/atlas-ddm-monitoring/rrd/plots/stack4ht2.png

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• http://atlas-ddm-monitoring.web.cern.ch/atlas-ddm-monitoring/rrd/plots/stackday.png
• http://atlas-ddm-monitoring.web.cern.ch/atlas-ddm-monitoring/rrd/plots/stackdayLYON.png
• http://atlas-ddm-monitoring.web.cern.ch/atlas-ddm-monitoring/rrd/plots/stackdayt2.png

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• http://atlas-ddm-monitoring.web.cern.ch/atlas-ddm-monitoring/rrd/plots/stackweek.png
• http://atlas-ddm-monitoring.web.cern.ch/atlas-ddm-monitoring/rrd/plots/stackweekLYON.png
• http://atlas-ddm-monitoring.web.cern.ch/atlas-ddm-monitoring/rrd/plots/stackweekt2.png

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• Transfer rates for LYON and associated T2s (validated files by DDM):
  • LYON
  • BEIJING
  • LAL
  • LAPP
  • LPC
  • LPNHE
  • SACLAY
  • TOKYO

• Detailed information on each site

• File transfer state in LYON

Information from FTS monitoring

• Atlas FTS transfer rate

• CERN->Lyon FTS transfer rate

• T1->T2 :
  • 15 concurrent files and 10 streams for LYON-TOKYO
  • 5 concurrent files and 5 streams for LYON-BEIJING (SE not enough powerful for 15/15 )
  • 10 concurrent files and 10 streams for LYON-French T2s (LAL, LPNHE, LPC, SACLAY) except for LAPP (5 concurrent files and 1 stream)

Information from dCache monitoring (provided by Lyon)

• Monitoring of dcache for SC4 areas
• LYONDISK : 25 gridftp concurrent access maximum
• LYONTAPE : 10 gridft concurrent access maximum

VOBOX Configuration

• 4 processors 3 GHz
• 4 GB of memory ( 2 GB dedicated to SWAP)
• The monitoring of the Vobox daily, weekly and monthly can be found Here

Disk space availability

• BEIJING
• CPPM
• GRIF
• LPC
• LAPP
• TOKYO
• LYON

Daily news

• SC4 Data Managment Daily log

• SC4 transfers from LYON to T2s:
  • Simultaneous transfers to the 7 T2 sites for more than 24 hours; it reached more than 25MB/s
  • 

Post-mortem DDM meeting

• Presentation at CERN (M. Branco) showing the results of the SC4 tests. (1 August 2006)

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