svn user forum
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
CERN IT DepartmentCH-1211 Genève 23
Switzerlandwww.cern.ch/it
PES
SVN User ForumDavid Asbury
Alvaro Gonzalez AlvarezPawel Kacper Zembrzuski
16 April 2010
CERN IT DepartmentCH-1211 Genève 23
Switzerlandwww.cern.ch/it
PES Agenda for Today
Welcome CERN IT Reorganisation SVN Client Versions Status of Service, Migration to SVN Current Efforts Performance Questions
SVN User Forum 216 April 2010
CERN IT DepartmentCH-1211 Genève 23
Switzerlandwww.cern.ch/it
PES CERN IT Reorganisation
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
SVN User Forum 316 April 2010
CERN IT DepartmentCH-1211 Genève 23
Switzerlandwww.cern.ch/it
PES SVN Client Versions
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
SVN User Forum 416 April 2010
CERN IT DepartmentCH-1211 Genève 23
Switzerlandwww.cern.ch/it
PES Incidents and Support
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
SVN User Forum 516 April 2010
CERN IT DepartmentCH-1211 Genève 23
Switzerlandwww.cern.ch/it
PES Status of the Service
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)
SVN User Forum 616 April 2010
CERN IT DepartmentCH-1211 Genève 23
Switzerlandwww.cern.ch/it
PES CVS Projects
SVN User Forum 716 April 2010
CERN IT DepartmentCH-1211 Genève 23
Switzerlandwww.cern.ch/it
PES SVN Projects
SVN User Forum 816 April 2010
CERN IT DepartmentCH-1211 Genève 23
Switzerlandwww.cern.ch/it
PES Current Efforts
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!
SVN User Forum 916 April 2010
CERN IT DepartmentCH-1211 Genève 23
Switzerlandwww.cern.ch/it
PES Performance: CVS v SVN
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
SVN User Forum 1016 April 2010
CERN IT DepartmentCH-1211 Genève 23
Switzerlandwww.cern.ch/it
PES Redundant Server Model
SVN User Forum 1116 April 2010
CERN IT DepartmentCH-1211 Genève 23
Switzerlandwww.cern.ch/it
PES Performance Studies (1)
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
SVN User Forum 1216 April 2010
CERN IT DepartmentCH-1211 Genève 23
Switzerlandwww.cern.ch/it
PES Performance Studies (2)
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
SVN User Forum 1316 April 2010
CERN IT DepartmentCH-1211 Genève 23
Switzerlandwww.cern.ch/it
PES Suggestions and Questions
Email to [email protected] Don’t expect instant replies!
SVN User Forum 1416 April 2010