Difference between revisions of "Atlas:SC4"

Un article de lcgwiki.
Jump to: navigation, search
(Post-mortem DDM meeting)
(Daily news)
Ligne 89: Ligne 89:
* [https://uimon.cern.ch/twiki/bin/view/Atlas/DDMSc4#Daily_log SC4 Data Managment Daily log]
* [https://uimon.cern.ch/twiki/bin/view/Atlas/DDMSc4#Daily_log SC4 Data Managment Daily log]
* 20 June 2006: Mail from Miguel Branco (DDM responsible)
<span style="color:#663300;">Today we started deploying DQ2 on the remaining T1 sites (not all
sites still available).<br/>
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.<br/>
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..
[[Image:Atlas day-jpeg.jpg]]
* SC4 transfers from LYON to T2s:  
* SC4 transfers from LYON to T2s:  

Version du 13:58, 25 septembre 2006

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
    • 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


Information from FTS monitoring

  • 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)

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

Daily news

  • SC4 transfers from LYON to T2s:
    • Simultaneous transfers to the 7 T2 sites for more than 24 hours; it reached more than 25MB/s
    • StackdayLYON-27-7.png

Post-mortem DDM meeting