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) (written in french)

• T0 Role(CERN)
  • Produce dummy files with 1 to 2 GB size(RAW, ESD et AOD)
  • 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)
  • Send all AODs to each T2 (20 Mo/s) using Lyon FTS server
  • Regurlarly cleanup files
• T2 Role (BEIJING, LAL, LPC, TOKYO)
  • Get files from T1 (Lyon)
  • Clean-up the files (?)
• Other roles
  • ATLAS (S. Jézéquel) : Initiate T1->T2 transfers

Information from DDM monitoring

According to DDM team, the monitoring is too slow to display the correct information. Untill this is solved, only FTS transfer rates provided by Gridview are displayed:

Atlas FTS transfer rate
CERN->Lyon FTS transfer rate

• Transfer rates for LYON (validated files by DDM)
• Detailed information on each site
• [1]
• [2]

Daily news

• 20 June 2006: Mail from Miguel Branco (DDM responsible)

Today we started deploying DQ2 on the remaining T1 sites (not all sites still available).
Attached is the result of a (nice) ramp up, easily beating SC3's record (on the 1st day of export of SC4) peaking at ~ 270 MB/s. Each 'step' in the graph is an additional T1 being added to the export.
Dataset subscriptions are now slowing down and will resume tomorrow. Our DQ2 monitoring has been turned off and we expect to have it back tomorrow! Still a long way to go until we have a reasonable understanding of the limiting factors..