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CCRC ‘08 Readiness

CCRC ‘08 Readiness. Andrew C. Smith. DIRAC Pit -> Tier0 Responsibility. RequestDB accepts Data Management requests Transfer agent polls RequestDB Executes copy of file specified Register file in AdtDB Online Integrity Agent polls AdtDB Polls Castor for migration status

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CCRC ‘08 Readiness

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  1. CCRC ‘08 Readiness Andrew C. Smith

  2. DIRAC Pit -> Tier0 Responsibility • RequestDB accepts Data Management requests • Transfer agent polls RequestDB • Executes copy of file specified • Register file in AdtDB • Online Integrity Agent polls AdtDB • Polls Castor for migration status • If migrated polls for checksum value • File registered in FileCatalog • Standard interface to LFC,ProcDB,BK (changes replica flag) • Requires that the BK entry already present • Create removal request • Issued to RequestDB • Removal agent polls RequestDB • Executes removal of file Online system • Actually only marks file as candidate for removal Andrew C. Smith

  3. Status of DIRAC Components • All components tested last spring • DIRAC2 framework • Components present and heavily tested in DIRAC3 • SRM2/SRM1 and Castor/RFIO storage plug ins • Storage Element • Instantiates all storage plug ins in CS (using StorageFactory) • Can change which protocol used for upload through CS • ReplicaManager • Links StorageElement and FileCatalog functionality • RequestDB • Client and server (file and MySQL backend) present • Components to be migrated to DIRAC3 • TransferAgent (copy, copyAndRegister, replicate, replicateAndRegister) • RemovalAgent (removeFile, removeReplica, removePhysicalFile) • Online Integrity Agent • AdtDB Andrew C. Smith

  4. Timeline for testing • Simple -> Complex • Replication of dummy files to Castor (14/01) • TransferAgent to be finalised • Ensure SRM and RFIO can be used • Replication and registration in AdtDB (16/01) • AdtDB to be migrated • Replication, registration, migration status (18/01) • Online Integrity Agent to be migrated • Full Chain (21/01) • RemovalAgent to be finalised • Continual operation… Andrew C. Smith

  5. Monitoring • What are we interested in knowing? • Some possibilities…. • RequestDB • Number of requests in db, request latency • TransferAgent • Time for transfer, transfer failures (with reason) • AdtDB • Number of files awaiting migration, average time for migration • Online Integrity Agent • Files passing/failing checksum check • RemovalAgent • Files removal success/failure • File lifetime… • Service/DB maintains full lifetime of LFNs • All file status changes logged • e.g. upload to T0, migrated, checksum verified, LFC registered, BK registered, ProcDB registered, replicated to *-RAW, *-RAW checksum verified, *-RAW replica processed Andrew C. Smith

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