Steve Traylen PPD Rutherford Lab Grid Operations PPD Christmas Lectures Steve Traylen RAL Tier1 Grid Deployment

Steve Traylen PPD, Rutherford Lab LCG’s Status Today Site Monitoring Tools Resolving Site Problems Recent Grid Services at RAL

Steve Traylen PPD, Rutherford Lab SRM/DCache at RAL A disk only DCache with SRM is published in LCG. –Currently 20TB, growing at a few TB a week. –CMS actively using it for a number of weeks. –Atlas and LHCb can do so now.

Steve Traylen PPD, Rutherford Lab DCache Layout at RAL

Steve Traylen PPD, Rutherford Lab SRM/DCache Multiple disk servers accessed in a uniform way. The SRM supports transport protocols: –GridFTP –GSI-dcap has a POSIX interface. Accessing byte ranges is possible. Flushing a node is possible. Interface of DCache to ADS will be done in the new year.

Steve Traylen PPD, Rutherford Lab Grid Monitoring Tools Lots of different systems. –Real Time Monitor or the “Flying Bricks” –Gstat or the GiiS sanity checks. –Daily functional tests or “Piotr’s tests” –APEL or accounting package.

Steve Traylen PPD, Rutherford Lab Real Time Monitor Written at Imperial. Queries RBs to find job locations.

Steve Traylen PPD, Rutherford Lab GStat Written in Taiwan by Min Tsai. –Checks the sanity of published information. –Publishes history of various metrics. –Publishes lists of resources available to a VO. –

Steve Traylen PPD, Rutherford Lab Daily Functional Tests Run once at each site per day. –Checks all the functions of replication. –Checks CA root certs are correct. –Checks job environment is what it should be.

Steve Traylen PPD, Rutherford Lab Accounting Counting CPU time used per VO across LCG/EGEE must be UK GOC has a deployed solution for this. It uses R-GMA for transport of Data.

Steve Traylen PPD, Rutherford Lab Pulling Tests Together All the results are now being pushed into R-GMA. This allows different views to be queried from the database. –LCG view. –Site view. –ROC (Regional) view.

Steve Traylen PPD, Rutherford Lab CIC on Duty The 5 CICs. (Core Infrastructure Centres) –RAL, CERN, IN2P3, INFN and MSU. Active “proding” of sites is taken by one of the CICs in rotation. ROCs help sites fix their problems. All previous tools are used to diagnose and suggest solutions.

Steve Traylen PPD, Rutherford Lab CIC on Duty A large knowledge base of observed problems is maintained as a WIKI site. Urgency is also assigned to site problems Problems not fixed are escalated. – , 2 nd , Phone and GDB. All tracked within Savannah. Number of detected problems is still increasing which is good.

Steve Traylen PPD, Rutherford Lab