Atlas

Bienvenue sur la page Atlas LCG-France
Welcome to the LCG-France Atlas page

=== DOMA_FR project

• Atrium version 2018

DOMA_FR tests

• Data Access (read/transfer/write) Nomenclature

• Global transfers from/ to (same site dest/source site excluded)

Header text	LAPP	LPSC	CC
From	Link	Link	Link
To	Link	Link	Link

• Data access monitorings as seen by site WN

Destination of access	LAPP	LPSC	CC
Production download	Link	Link	Link
Production upload	Link	Link	Link
Production input	Link	Link	Link
Production output	Link	Link	Link
Analysis Download	Link	Link	Link
Analysis Direct Access	link	Link	Link

• Logbook and access configuration

• Current conclusion
  • Enabling direct access creates much more network usage -> Is it usefull for ATLAS ? (processing urgent request faster ?)
  • Production job brokering prefers to send input data (Production_input) to IN2P3-CC_DATADISK instead of IN2P3-LAPP_DATADISK because single file connected is (expected to be better). Can we check if there are more temporary files in IN2P3-CC_DATADISK ?
  • 10 Gb/s connection LAPP-CC (used for all LAPP WAN transfers to any site) can get saturated if huge amount of jobs starting at same time (No smoothing by Panda)
  • Production_output can only be done to 1 site

• Next steps
  • Deploy Rucio 1.17 to use protocol priority defined in AGIS (bug in 1.16). Solving bug : use most trusted protocol and would help to control srm decreasing usage
  • Monitor job efficiency vs RTT between SE and WN -> Identify when cache does not have impact (assuming no network bandwidth limitation)
  • Understand the ATLAS job brokering algorithm
  • Get the typical transfer rate per job type