1. 1 LCG-France sites contribution to the LHC activities in 2007 A.Tsaregorodtsev, CPPM, Marseille 14 January 2008, LCG-France Direction

2. 2 Outline  LHCb activities in 2007  T1 contribution  T2 contributions  Conclusion

3. 3 LHCb activities in 2007  MC production  Limited, more emphasis on data reprocessing and analysis  Not evenly distributed over the year Working on physicist’s requests  ~400M events produced  ~100TB data stored  Data distribution  DST and DIGI data to all the T1 centers  First tests done with SRM2.2 end-points FTS transfers

4. 4 LHCb activities in 2007  Data reconstruction and filtering (stripping)  Done in the T1 centers  Lots of difficulties with data access in the Storage systems  Migration of sites to SLC4 created quite a lot of problems Storing and accessing data Bugs in the middleware, incompatibility with the LHCb software stack (python versions, 32-64 bit platforms sw mixture, etc)  Depends on versions of the reconstruction and analysis applications  User analysis  Done in the T1 centers  Low activity at the beginning of 2007 High in the end  CERN batch queues are overloaded Analysis spills over to other T1 centers

5. 5 T1 resources contribution by LCG-France  CC/IN2P3 actively participated in all the LHCb activities  CC/IN2P3 resources provided  15 MUI (87M SI2K) ~50% of the 2007 request  6.4% of the total LHCb resources  16% of the total LHCb T1 resources ( including CERN )  1160M SI2K requested for 2008 ~18% of the LHCb total (T1+T2)  Total 35K production jobs

6. 6 T1 resources contribution by LCG-France  ~30% of jobs through local batch system access via DIRAC Job Agent in the beginning 2008  Now ~100% grid access  Job efficiency  High for MC production jobs  Low (~65%) for reconstruction jobs needing access to data  Data reconstruction at T1/IN2P3  Progressing with difficulties  Smoother at CC/IN2P3 than at other sites

7. 7 Data storage at T1  Disk storage  62TB stored on disks (18% of the LHCb T1 total) 103 TB requested for 2007  Disk storage provisioning was in time for 2007  280 TB required in 2008  Tape storage  18TB stored in HPSS ( ~8 % of the LHCb T1 total)  No problem with provisioning  230 TB required in 2008

8. 8 Data access at T1  Data access is problematic  Many failures due to lost connections to the data  Several periods where data access was completely impossible Situation not unique to CC/IN2P3  The dCache access is suffering problems right now  Access to data on tapes needs prestaging before the jobs are submitted  Special service developed in the LHCb DIRAC WMS  Data management operations are slow  Clean-up of the disk storage takes weeks  Needs intervention of the local managers Difficult and slow to remove data through standard service interfaces

9. 9 User analysis at T1  Progressively increasing  57K total LCG jobs in November 2007  7140 in CC/IN2P3 (12.5% of the total)  Long periods with ~1000 concurrent jobs  Highly depends on the steady functioning of the Storage Elements  Can not distribute all the data everywhere  Some data unavailable if an SE suffering problems  No preference for accessing national resources by local users  Advantageous especially when resources access is unstable

10. 10 User analysis jobs  Number of analysis jobs in LHCb as a whole  Analysis jobs at CC/IN2P3

11. 11 LHCb services at T1 center a Lyon  FTS  Configured for the SRM2.2 end-point  Tests are OK  LHCb VO-box  An instance of the Configuration Services  Request Database supporting the DIRAC failover mechanisms  LCG File Catalog instance  A mirror of the Master instance at CERN  Automatic metadata replication with ORACLE streams  Operational since December 2007  Important service for the CCRC’08

12. 12 SiteCPU contribution,% LCG.AUVER.fr0.20 LCG.CGG.fr0.16 LCG.CPPM.fr0.37 LCG.IPSL-IPGP.fr0.08 LCG.LAL.fr0.41 LCG.LPC.fr0.96 LCG.LAPP.fr0.76 LCG.LPN.fr0.27 Total2.21 T2 resources contribution by LCG-France  Tier2-Tier3 contributions to LHCb resources

13. 13 T2 resources contribution by LCG-France  Total of the T2-T3 LHCb contribution - 3.7%  Low because of limited MC production in 2007  T2 LCG-France LHCb resources are small  Job distribution via LCG WMS brokers Low ranking of the relatively small french T2 sites  Mostly MC production  Small fraction of user toy MC jobs  High efficiency rate close to 100%  No input data

14. 14 Summary  2007 was a rather difficult year with many problems to solve due to a rapid middleware and software evolution  SLC4, gLite, SRM2.2, applications, etc  Data production is affected by the data access problems  Resources consumption is determined by the amount of data possible to reprocess  No special quotas reserved for the french users on the LCG-France resources:  Similar to policies for other national resources  LHCb policies are defined by group activities  Good support for the LHCb activities by the contact persons