4/20/02APS April Meeting1 Database Replication at Remote sites in PHENIX Indrani D. Ojha Vanderbilt University (for PHENIX Collaboration)
4/20/02APS April Meeting2 Index PHENIX Computing Model Need for Database Replication Methods Summary
4/20/02APS April Meeting3 PHENIX Computing Model
4/20/02APS April Meeting4 Need for Database Replication Simulation starts with event generation followed by detector simulation Realistic event reconstruction processes need detector calibration data This is stored into Objectivity/DB Local copy of DB improves the availability of these critical data Enhances read performances when accessing these data Less burden on central computing system (rcf) by using outside computing power and storage
4/20/02APS April Meeting5 Replication Methods Homemade backup/restore – PHENIX rebuilds software each night – Makes a backup copy of database at Rhic Computing Facility – Remote sites get backup copy of PHENIX Federation – Restore and install locally – This is not automatic – _vmps.html _vmps.html
4/20/02APS April Meeting6 Objectivity/DB: Data Replication Option Create multiple copies of database on same machine or across LAN/WAN Provide full read/write access to replicated databases Update of one database image automatically updates others Useful for PHENIX – High read performance – Low update frequency Test version is working at Vanderbilt
4/20/02APS April Meeting7 Data Grid: Grid Data Mirroring Package Grid technology is popular in distributed and parallel computing Data grid is ‘Data intensive Grid’ Provides access to terabytes of distributed and replicated data Requires data consistency, security and high speed transfer GDMP provides asynchronous replication mechanism (CMS, CERN) GLOBUS toolkit is used for middle-ware
4/20/02APS April Meeting8 Customize: Grid Data Mirroring Package
4/20/02APS April Meeting9 Summary For a few replication ‘Back-restore- install’ method is working Objectivity/DB DRO is working, need more testing Customize GDMP is a promising option