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Database Readiness Workshop Summary

Database Readiness Workshop Summary. Dirk Duellmann, CERN IT For the LCG 3D project http://lcg3d.cern.ch SC4 / pilot WLCG Service Workshop 11th February, Mumbai. Why a LCG Database Deployment Project?.

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Database Readiness Workshop Summary

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  1. Database Readiness Workshop Summary Dirk Duellmann, CERN IT For the LCG 3D project http://lcg3d.cern.ch SC4 / pilot WLCG Service Workshop 11th February, Mumbai

  2. Why a LCG Database Deployment Project? • LCG today provides an infrastructure for distributed access to file based data and file replication • Physics applications (and grid services) require a similar services for data stored in relational databases • Several applications and services already use RDBMS • Several sites have already experience in providing RDBMS services • Goals for common project as part of LCG • increase the availability and scalability of LCG and experiment components • allow applications to access data in a consistent, location independent way • allow to connect existing db services via data replication mechanisms • simplify a shared deployment and administration of this infrastructure during 24 x 7 operation • Scope set by PEB • Online - Offline - Tier sites Dirk Duellmann

  3. 3D Participants and Responsibilities • LCG 3D is a joint project between • Service users: experiments and grid s/w projects • Service providers: LCG tier sites including CERN • Project itself has (as all projects) limited resources (2 FTE) • Mainly coordinating requirement discussions, testbed and production configuration, setup and support • Rely on experiments/projects to define and validate their application function and requirements • Rely on sites for local implementation and deployment of testbed and production setup Dirk Duellmann

  4. LCG 3D Service Architecture Oracle Streams http cache (SQUID) Cross DB copy & MySQL/SQLight Files O S M S T0 - autonomous reliable service T1- db back bone - all data replicated - reliable service O O F T2 - local db cache -subset data -only local service • Online DB • autonomous reliable service • Pit or CERN CC O M S S Dirk Duellmann

  5. Online-Offline Connection • A well-documented schema was reported at the last LCG3D Workshop Artwork by Richard Hawkings Dirk Duellmann Slide : A. Vaniachine

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  8. LCG Database Deployment Plan • After October ‘05 workshop a database deployment plan has been presented to LCG GDB and MB • http://agenda.cern.ch/fullAgenda.php?ida=a057112 • Two production phases • March - Sept ‘06 : partial production service • Production service (parallel to existing testbed) • H/W requirements defined by experiments/projects • Based on Oracle 10gR2 • Subset of LCG tier 1 sites: ASCC, CERN, BNL, CNAF, GridKA, IN2P3, RAL • Sept ‘06- onwards : full production service • Adjusted h/w requirements (defined at summer ‘06 workshop) • Other tier 1 sites joined in: PIC, NIKHEF, NDG, TRIUMF Dirk Duellmann

  9. Proposed Tier 1 Hardware Setup • Propose to setup for first 6 month • 2/3 dual-cpu database nodes with 2GB or more • Setup as RAC cluster (preferably) per experiment • ATLAS: 3 nodes with 300GB storage (after mirroring) • LHCb: 2 nodes with 100GB storage (after mirroring) • Shared storage (eg FibreChannel) proposed to allow for clustering • 2-3 dual-cpu Squid nodes with 1GB or more • Squid s/w packaged by CMS will be provided by 3D • 100GB storage per node • Need to clarify service responsibility (DB or admin team?) • Target s/w release: Oracle 10gR2 • RedHat Enterprise Server to insure Oracle support Dirk Duellmann

  10. DB Readiness Workshop last Monday • http://agenda.cern.ch/fullAgenda.php?ida=a058495 • Readiness of the production services at T0/T1 • status reports from tier 0 and tier 1 sites • technical problems with the proposed setup (RAC clusters)? • open questions from sites to experiments? • Readiness of experiment (and grid) database applications • Application list, code release, data model and deployment schedule • Successful validation at T0 and (if required T1)? • Any new deployment problems seen by experiment users which need a service change • Review site/experiment milestones from the database project plan • (Re-)align with other work plans - eg experiment challenges, SC4 Dirk Duellmann

  11. T0 Database Service Evolution • Until summer 2005 • Solaris based shared Physics DB cluster (2-nodes for HA) • Low CPU power, hard to extend, shared by all experiments • (many) linux disk servers as DB servers • High maintenance load, no resource sharing, no redundancy • Now consolidation on extensible database clusters • No sharing across experiments • Higher quality building blocks • Midrange PCs (RedHat ES) • FibreChannel attached disk arrays • As of last month - all LHC services moved Slide : Maria Girone Dirk Duellmann

  12. CERN Hardware evolution for 2006 • Linear ramp-up budgeted for hardware resources in 2006-2008 • Planning next major service extension for Q3 this year Slide : Maria Girone Dirk Duellmann

  13. Tier 0 preps • Database Service extension going according to schedule • Resource prioritization and extension planning needs experiment involvement (and real deployment experience) • Significant lead time for h/w orders - need experiment / project requests early! • Also Streams and Frontier setups proceeding well • New downstream capture proposal under test - seems promising to avoid some couplings observed in the test bed during site problems • Need production setup for Database Monitoring (Oracle Grid Control 10gR2) • Tier 1s may use another local grid control instance • Two agents reporting into common 3D and local Grid Control Dirk Duellmann

  14. Tier 1 Progress • Sites largely on schedule for a service start end of March • h/w either installed already (BNL, CNAF, IN2P3) or expect delivery of order shortly (GridKA, RAL) • Some problems with Oracle Clusters technology encountered and solved! • Active participation from sites - DBA community building up • First DBA meeting focusing on RAC installation, setup and monitoring hosted by Rutherford scheduled for second half of March • Need to involve remaining Tier 1 sites now • Establishing contact to PIC, NIKHEF, NSG, TRIUMF to follow workshops, email and meetings Dirk Duellmann

  15. Service Issues • Oracle Issues • X.509(proxy) certificates - will they be supported by Oracle? • s/w and support licenses for Tier 1 • instant client distribution within LCG • With commercial Oracle contact (IT-DES group) and IT license officer • Application Server support • During initial phase (March-Sept) CMS proposed to support tomcat/frontier/squid setup • Will discuss other experiments requirements Dirk Duellmann

  16. Databases in Middleware & Castor • Took place already for services used in SC3 • Existing setups at the sites • Existing experience with SC workloads -> extrapolate to real production • LFC, FTS - Tier 0 and above • Low volume, but high availability requirements • CERN: Run on 2-node Oracle cluster; outside single box Oracle or MySQL • CASTOR 2 - CERN and some T1 sites • Need to understand scaling up to LHC production rates • CERN: Run on 3 Oracle servers • Currently not driving the requirements for the database service • Need to consolidate databases configs and procedures • may reduce effort/diversity at CERN and Tier 1 sites Dirk Duellmann

  17. LCG Application s/w Status • COOL and POOL have released versions based on CORAL • Includes re-try and failover required for reliable db service use • These features need be tested for experiment • POOL includes production version FroNTier plug-in • Control of SQUID caching may still be required to implement more realistic caching policies • These releases (or bug fixes) are target for 2006 deployment • LCG s/w expected to be stable by end of February for distributed deployment as part of SC4 or experiment challenges • Caveats: • COOL still has important functionality items on the development plan for this year • Conditions schema stability will need careful planning for COOL and FroNTier Dirk Duellmann

  18. Experiment Applications Status • Conditions - Driving the database service size at T0 and T1 • EventTAGs (may become significant - need replication tests and concrete experiment deployment models) • Framework integration and DB workload generators exist • successfully tested in various COOL and POOL/FroNTier tests • T0 performance and replication tests (T0->T1) looks ok • Conditions: Online -> Offline replication only starting now • May need additional emphasis for online tests to avoid surprises • CMS and ATLAS are executing online test plans • Progress in defining concrete conditions data models • CMS showed most complete picture (for Magnet Test) • Still quite some uncertainty about volumes, numbers of clients Dirk Duellmann

  19. Test Status : 3D testbed • Replication test in progress • Offline->T1: • COOL ATLAS : Stefan Stonjek (CERN, RAL, Oxford) • COOL LHCb : Marco Clemencic (CERN, RAL, GridKA?) • FroNtier CMS : Lee Lueking (CERN and several t1/t2 sites) • ARDA AMGA: Birger Koblitz (CERN->CERN) • AMI : Solveig Albrandt (IN2P3->CERN) • Online->offline: • CMS Conditions : Saima Iqbal (functional testing) • ATLAS : (Gancho Dimitrov) Server setup, networking config with pit network • LHCb : planning with LHCb online • Coordination during weekly 3D meetings • Status: successful functional test - ramping up volume/load Dirk Duellmann

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  21. Summary • Database Production Service and Schedule defined (unchanged since GDB/MB approval) • Phase 1 - end of March: ASCC, BNL, CERN, CNAF, IN2P3, RAL • Full deployment - end of September: PIC, NIKHEF, NDG, TRIUMF • Consolidation with grid service oracle setups • Setup progressing on schedule at tier 0 and 1 sites • Application performance tests progressing • First larger scale conditions replication tests with promising results for streams and frontier technologies • Concrete conditions data models still missing for key detectors Dirk Duellmann

  22. “My Conclusions” • There is little reason to believe that a distributed database service will move into stable production any quicker than any of the other grid services • Should start now with larger scale production operation to resolve the unavoidable deployment issues • Need the cooperation of experiments and sites to make sure that concrete requests can be quickly validated against a concrete distributed service Dirk Duellmann

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