1. Report on CVS Services : Central and LCG-dedicated services Sebastian.Lopienski@cern.ch Manuel.Guijarro@cern.ch CERN IT/PS/UI May 2004

2. Report on CVS Services – S. Lopienski, M. Guijarro, (CERN IT/PS/UI) – May 2004 Outline Overview Projects What do they offer? Architectures Advantages Drawbacks Implementation Figures Problems Future

3. Report on CVS Services – S. Lopienski, M. Guijarro, (CERN IT/PS/UI) – May 2004 CERN CVS Services Overview hosting CERN-related software projects Central CVS service: created following a service request - collection of user requirements - architecture proposals - implementation based on assigned resources - in production since 08/2002, 71 projects and 12GB of data LCG dedicated CVS service: requested not to rely on AFS - aligns, as much as possible, with Central CVS service setup - in production since 02/2004, 22 projects and 1.5GB of data

4. Report on CVS Services – S. Lopienski, M. Guijarro, (CERN IT/PS/UI) – May 2004 CERN Central CVS Service Projects AB-CO FPGA designs AB-RF-CS Section Software Anaphe AtCom II ATLAS ATLAS TDAQ RobIn ATLAS Networking Automatic Driver Code Generation BIC surveillance project CASTOR project CCDB CERN Central CVS Service CERN Fire and Gas detection CERN Oracle Grid Data Management Services CERN Safety Alarm Monitoring CESAR Project Chorus (W95) experiment Compass Reconstruction Program Computer Centre - Operational Procedures Management CSDB project Cyan Jaguar Diana Network device information analysing and monitoring Project EDG Project at CERN EGEE Middleware SCM Tools EJB Platform Project ELFms Extremely Large Fabric Management Front End Software Architecture Ganga – Gaudi/Athena and Grid Alliance Gaudi GridSite GUI Platform project HEPiX scripts IT-FIO software IT-PS-UI software Itcobe Java Api for Parameter Control Java Data Viewer LCG Oracle AS + DB Tier 1 Deployment LHC Alarm Service Project LHC Logging Project LHC Orbit feedback LHCb software Machine Component State Manager Macsy MammoGrid project Middle Tier Server for CMW NA48 analysis software NA60 Offline Project OASIS software OPERA project PHOS Trigger Router Unit...

5. Report on CVS Services – S. Lopienski, M. Guijarro, (CERN IT/PS/UI) – May 2004 CERN CVS Services What do they offer? data integrity (mirror every hour, daily archiving) several access methods: Kerberos IV, SSH, pserver automatic CVS lock monitoring and reporting good performance web user interfaces (CVSWeb, ViewCVS, Bonsai); administration tools: Project creation, Access restrictions, service support (200 Remedy trouble tickets per year + Web documentation) service monitoring (UIMON, CVS access check, Archiving check,…)

6. Report on CVS Services – S. Lopienski, M. Guijarro, (CERN IT/PS/UI) – May 2004

9. Architectures Central Service vs LCG Service repositories X.cvs.cern.ch Project X 12N servers

10. Report on CVS Services – S. Lopienski, M. Guijarro, (CERN IT/PS/UI) – May 2004 Advantages Central Service vs LCG Service fastest possible access to the repositories (local file system) independent of AFS automatic and transparent load-balancing and fault tolerance (via an ISSCVS DNS alias that distributes CVS requests among a farm of four servers)

11. Report on CVS Services – S. Lopienski, M. Guijarro, (CERN IT/PS/UI) – May 2004 Drawbacks Central Service vs LCG Service dependency on AFS and DNS constant mirroring may affect performance load-balance is on repository level (not request level) slave server down => no fault tolerance fail-over requires human intervention (for the time being)

12. Report on CVS Services – S. Lopienski, M. Guijarro, (CERN IT/PS/UI) – May 2004 Implementation Central Service vs LCG Service DNS relocation via ISSCVS ISSCVS: A central service queries some home made metrics in each CVS server Redirects every 30 secs Metrics: SSH SNMP For more info: V. Bahyl AFS (NFS?) automatic AFS volume resizing (adapt to each repository needs). tools and web interfaces for project relocation (via DNS) CVS domain cvs.cern.ch data replication system (CVSUP) access to repositories and user home directories on a file-system level via NFS automatic relocation not wanted

13. Report on CVS Services – S. Lopienski, M. Guijarro, (CERN IT/PS/UI) – May 2004

14. Figures Central Service vs LCG Service 71 projects 4 new projects per month Ave. Size= 170MB Top. Size > 4GB less than 12 hours/year downtime 22 projects Not growing Ave. Size= 70MB Top. Size > 270MB less than 12 hours/year downtime

15. Report on CVS Services – S. Lopienski, M. Guijarro, (CERN IT/PS/UI) – May 2004 # of projects trend

16. Report on CVS Services – S. Lopienski, M. Guijarro, (CERN IT/PS/UI) – May 2004 Not so many problems disk failures: - some Western Digital 120GB disks models were faulty - backplane installation (less vibration) computer centre: - refurbishment (relocation of servers) - power cuts - several short network interruptions (mainly at non-working hours) partial interruptions: CERN firewall, AFS problems - affecting only some users

17. Report on CVS Services – S. Lopienski, M. Guijarro, (CERN IT/PS/UI) – May 2004 Future provide Kerberos V access (CERN soon ready) slave server relocation for LCG hardware update (some nodes are 5 years old) automatic detection of inactive projects migrate monitoring from UIMON->Lemon ¾ of service manpower will disappear => no more dev.

18. Report on CVS Services – S. Lopienski, M. Guijarro, (CERN IT/PS/UI) – May 2004 Thank you! Any questions? More information at: http://cern.ch/cvs http://cern.ch/lcgcvs