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Alice DAQ Configuration DB

Alice DAQ Configuration DB. Sylvain.Chapeland@cern.ch. TDS. TDS. ALICE DAQ Architecture. Rare/All. CTP. BUSY. BUSY. LTU. LTU. DDL H-RORC. HLT Farm. TTC. TTC. FEP. FEP. FERO. FERO. FERO. FERO. Event Fragment. 163 DDL. 343 DDL. 10 DDL 10 D-RORC 10 HLT LDC. 425 D-RORC.

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Alice DAQ Configuration DB

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  1. Alice DAQConfiguration DB Sylvain.Chapeland@cern.ch

  2. TDS TDS ALICE DAQ Architecture Rare/All CTP BUSY BUSY LTU LTU DDL H-RORC HLT Farm TTC TTC FEP FEP FERO FERO FERO FERO Event Fragment 163 DDL 343 DDL 10 DDL 10 D-RORC 10 HLT LDC 425 D-RORC LDC LDC LDC LDC LDC 200 Detector LDC Load Bal. Sub event Event-Building Network EDM Event 50 GDC 10 DS GDC GDC GDC DS DS GDC File PDS Storage Network 25 TDS

  3. TDS TDS ALICE DAQ Architecture Trigger High-Level Trigger CTP LTU LTU HLT Farm TTC TTC FEP FEP Detectors FERO FERO FERO FERO LDC LDC LDC LDC LDC Event-Building Network EDM GDC GDC GDC DS DS GDC PDS Storage Network Data Acquisition

  4. DATE v4 - configuration 2004 • DATE Configuration stored in ASCII files • $DATE_SITE_CONFIG • Shared by NFS • DATE DB package used to read static information: • roles (who is what) … • detectors (what detectors and sub-detectors are made of) … • triggers (what is activated by each trigger) … • event building (what to do with the events on GDCs) … • memory banks (where to store the data structures) • Readout equipment (data sources on LDCs) • RunControl parameters (dynamic) • Misc. items: DIM DNS, environment, …

  5. DATE v5 - configuration 2005 • SQL based • Constraints to avoid inconsistencies • GUI • APIs unchanged • Backward compatible (runtime/compile switch) • Critical shared resources distributed with SQL • Few static items still in flat files 2007: Now everything in MySQL

  6. Operator console MySQL server DATE nodes Architecture

  7. SQL db • Improves data distribution and configuration integrity compared to NFS ASCII files. • Simple structure, few tables (10s), little data (1000s records) • Peak read access when DAQ starts (100s clients) • Infrequent write access (by operator and runcontrol) • No use of special features, standard SQL, any back-end should fit • DATE Language interfaces: C, Tcl/Tk, php

  8. Config db schema

  9. SQL db - requirements for development phase • Ease of installation • Dynamic setup, may need to create many times different systems • Independency for quick changes • Control on the server: • to monitor behavior • how to tune performance • improve server setup accordingly

  10. SQL db - requirements for production phase • Version control • Version must be stable during data taking period • Maintenance and operation • Fast reactivity, known procedures, internal know-how • On the fly setup change when needed (performance tuning, …)

  11. MySQL 2005 • Open source • Free DB system to distribute to institutes using DATE • Easy setup • Good feedback on bugs (#7838) • Platform compatibility • Interfaces for C, Tcl, Php … • Good performance • No strong dependency, in house expertise • MySQL version 4: innodb, … • MySQL version 5: promising features (views, triggers, …)

  12. MySQL • RPM setup, binary tarball, source compilation • Server setup: • Users and table creation with simple SQL commands • Can also copy an existing database: copy whole directory and it works (good for backup as well) • Client program: linked with corresponding platform library Installation is a matter of minutes

  13. DB performance tests

  14. Operator console MySQL server DAQ nodes DB performance tests Configuration DB: concurrent access 65 LDC, 65 GDC

  15. DB performance tests 2007

  16. MySQL operation • Excellent stability – no crash so far • Simplicity to setup & run • Scalable • Nice GUI tools: • MySQL Administrator • MySQL Query Browser • MySQL Workbench

  17. Other DB usage in Alice DAQ • infoLogger store logs of all DAQ nodes • Detector Config specific hardware configuration • File Exchange Server export data to outside world • Logbook Summary information for each run • Machine db DAQ hardware configuration: LAN, cables, racks, …

  18. Conclusion • Now entering production • Software ready and stable • Still flexible for new features • Good choice so far 

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