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SVN User Forum

SVN User Forum. David Asbury Alvaro Gonzalez Alvarez Pawel Kacper Zembrzuski 16 April 2010. Agenda for Today. Welcome CERN IT Reorganisation SVN Client Versions Status of Service, Migration to SVN Current Efforts Performance Questions. CERN IT Reorganisation.

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SVN User Forum

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  1. SVN User Forum David Asbury Alvaro Gonzalez Alvarez Pawel Kacper Zembrzuski 16 April 2010

  2. Agenda for Today SVN User Forum • Welcome • CERN IT Reorganisation • SVN Client Versions • Status of Service, Migration to SVN • Current Efforts • Performance • Questions

  3. CERN IT Reorganisation SVN User Forum • Jan 2010, most IT groups changed • CVS & SVN now in IT/PES group • Product and Engineering Support • Previous experts now in DB group • CVS & SVN now 3 people • David 80%, Alvaro 80%, Pawel 100% • 2 people after September 2010

  4. SVN Client Versions SVN User Forum • SVN Server version is 1.5 • SVN client on lxplus is 1.4 (ok with server) • SLC4 has client 1.4.4, SLC5 has 1.4.2 - ok • Problem when use later major client version then return to lxplus • Want lxplus version = SVN server version • Must still be careful with versions elsewhere

  5. Incidents and Support SVN User Forum • March 2010: adding new SVN server • Unexpected reordering of CDB templates  • Selected by load balancing, but login failed  • Full support during CERN working hours • Best-efforts basis outside this

  6. Status of the Service SVN User Forum • Projects: CVS ~300, SVN ~450 • Want to end LCGCVS by end 2010 • Difficult to support, several disadvantages • Much work to move CVS to SLC5 • SVN has many small projects • More efficient for performance, management • TRAC uses NAS disk system (DB group)

  7. CVS Projects SVN User Forum

  8. SVN Projects SVN User Forum

  9. Current Efforts SVN User Forum • Handling daily problems and questions • Performance studies - important • More servers on SVN for performance • Added 3 more servers, already better • Move CVS to SLC5 if not stopped (major) • TRAC plugins being tested • https://twiki.cern.ch/twiki/bin/viewauth/DESgroup/SVNFeatureRequest • Try to get Helpdesk to handle more queries • Very limited manpower for clients!

  10. Performance: CVS v SVN SVN User Forum • SVN is the future, so effort will be there • Want redundancy so AFS is an advantage • LCGCVS uses local disks • CVS slow as it writes lock files into the directory at check-out • SVN writes into a lower directory • So SVN benefits much more than CVS from load-sharing across multiple servers • SVN also offers repository protection

  11. Redundant Server Model SVN User Forum

  12. Performance Studies (1) SVN User Forum • Most daily activity happens 2200 to ~0100 • Looking at whole chain from file system to client • AFS volume placement, splitting • Network • CVS/SVN server • memory, • disk setup, • AFS cache configuration

  13. Performance Studies (2) SVN User Forum • Tests checking-out AFS volume on SSD • Local disks in LCGCVS: ~22 mins • AFS volume on SSD: ~31 mins • AFS volume on normal disk: ~40 mins • Impact on which machines to retire soon • Must retire some CVS servers soon (warranty) • Impact on new machine configurations

  14. Suggestions and Questions SVN User Forum • Email to svn.support@cern.ch • Don’t expect instant replies!

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