LCG Experiment Coordination Meeting

Monday 11 Jun 2007, 14:30 → 15:55 Europe/Zurich

28-R-015

Coordination meeting between LCG service and LHC experiments, focussing on issues for the coming weeks / months.

Subscribe to lcg-experiment-coordination@cern.ch to be kept informed...

To join the call, do one of the following:
a. Dial +41227676000 (Main) and enter access code 0166222, or
b. To have the system call you, click here: https://audioconf.cern.ch/call/0166222

(Leader code is 0166111)

14:30 → 14:40 FTS 2.0 pilot service and schedule / actions for move to production

At this meeting we need to conclude on experiment-testing of FTS 2.0, if we are to stick to the agreed timetable of:

• circa 1 month testing at CERN, including 1-2 patch updates;
• roll-out at all Tier1s to allow for the services to be fully debugged and settled in prior to dress rehearsal activities

This would translate to:

• June 11th 2007: experiments give the green light to FTS 2.0 deployment in production at CERN;
• June 18th 2007: upgrade of CERN services (TBC)
• July 9th 2007: green-light to Tier1 sites to start deployment of FTS 2.0 services at their sites;
• July/August: settling in and debugging at sites as required;
• Post-CHEP 2007: full production load.

The current status of experiment testing / validation (AFAIK) is:

• ALICE: ok given at June GDB;
• ATLAS: ok;
• CMS: ok;
• LHCb: ok.

14:40 → 14:45 FTS service monitoring requirements

From CMS "top 5" issues presented to MB in Prague:

• transfers and queues monitor
• backup servers
• heartbeat and similar ”service-is-up" monitoring

Can we come to a common requirement / proposal?

14:45 → 14:50 Status of WLCG Q1 Tx-Ty Transfer Milestones - aka Multi-VO tests

Proposal from June GDB is to attempt Tier0-Tier1 export for one week at the following daily averages:

• ATLAS - 650MB/s
• CMS - 200MB/s
• ALICE & LHCb - 30MB/s each

Any fluctuations in export rate need to be explained.

1. Demonstrate Tier0-Tier1 data export at 65% of full nominal rates per site using experiment-driven transfers

   Mixture of disk / tape endpoints as defined by experiment computing models, i.e. ~30% tape for ATLAS; transfers driven by experiments

   Period of at least one week; daily VO-averages may vary (~normal)

2. Demonstrate Tier0-Tier1 data export at 50% of full nominal rates (as above) in conjunction with T1-T1 / T1-T2 transfers

   Inter-Tier transfer targets taken from ATLAS DDM tests / CSA06 targets

3. Demonstrate Tier0-Tier1 data export at 35% of full nominal rates (as above) in conjunction with T1-T1 / T1-T2 transfers and Grid production at Tier1s

   Each file transferred is read at least once by a Grid job

   Some explicit targets for WMS at each Tier1 need to be derived from above

14:50 → 15:05 SRM v2.2 site / experiment test schedule and July pre-GDB meeing

July pre-GDB meeting

15:05 → 15:20 SLC4 SL3-compatibility Worker Nodes

So far access to the SLC4 SL3-compatibility Worker Nodes has only been available through the pre-production service. CERN plans to install the SLC4 32-bit native build gLite worker node middleware now it has been released and put them under a production CE. This will take several weeks and we would like to know if/when the experiments are ready for this. Jobs which can only run on SL3 will have to request this in their JDL. See: http://goc.grid.sinica.edu.tw/gocwiki/How_to_publish_my_machine_architecture http://goc.grid.sinica.edu.tw/gocwiki/How_to_publish_the_OS_name

Speaker: Ulrich Schwickerath (CERN)

15:20 → 15:25 Up-coming service interventions

Possible slots prior to start of Dress Rehearsals and Pilot LHC run:

• Slot in June, e.g. June 11 (following weeks are CMS / ATLAS weeks respectively).
• Week of CHEP 2007?? (1st week of September)

Foreseen interventions:

• Move of CASTOR DBs to better h/w (to be done by VO - service interruption involved). Now fully done - item to be removed.
• Deployment of new CASTOR version, including new LSF plug-in (ATLAS, CMS, PUBLIC, LHCb, ...)

  Proposed schedule:

  • PUBLIC: June 12
  • ATLAS : June 13
  • LHCB : June 18
  • CMS : TBD
  • ALICE : TBD

• Oracle Critical Patch updates
  • 17 April 2007 (skipped)
  • 17 July 2007
  • 16 October 2007
  • 15 January 2008

15:25 → 15:30 AOB