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Efficient Utility for Channel Archiving and Data Maintenance

An advanced archive utility for managing and optimizing channel data, with features like fast data writing, index tools, and improved data maintenance scripts. It offers RDB integration, web-based interface, and Oracle cluster support.

ryanssmith
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Efficient Utility for Channel Archiving and Data Maintenance

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  1. From theChannelArchiverto theBest Ever ArchiveUtility, Yet kasemirk@ornl.gov July 2009

  2. Channel Archiver IOC “ASCII” Config. Channel Access History ~2000:Started byBob Dalesio ~2003:Index Tools,Data Server ~2007:CSS Client Archive Engine config.xml Binary Data Files Data Server XML-RPC CSS-based OPI

  3. Problems • Data file format optimized to write many samples quickly • More then 40000/second • .. but we only used maybe 1000/sec • .. and many ill-configured or duplicate channels • Headaches with data maintenance: • Scripts to restart engines, copy data, update indices. • Index time grows with data • Stuck when index files reach 2GB • SNS Users faced with ~80 sub-archives • No clue what needs fixing after network/power problems • No idea who contributes how many samples • No way to remove selected channels or time ranges • Improving on this means implementing an RDB

  4. New Setup IOC Channel Access ArchiveEngine Samples Config. config.xml RDB(Oracle/MySQL) Other tools for config & samples EngineConfig -Import CSS-based OPI

  5. CSS Data Browser Handles Both • New URL • Just one‘RDB’sub-archive • Old and newdata can becombined inone plot

  6. Web Interface to Engine Config • Tomcat/JSP/Servlets to view and edit

  7. Web Config View: Channel Stats

  8. Web Config View: Sample Stats ?? OK

  9. Stats • 38 sample engines, 83000 channels • Host that runs sampling engine: • CPU load 45%, zero disk I/O wait, very responsive • Oracle • Cluster • Sample tables partitioned by day • 8000 samples/sec peakin write tests • Operationally maybe¼ of that • Better configurationwould likely havefewer samples/sec

  10. Summary, Status • At SNS, BEAUtY replaced Channel Archiver • Parallel operation for ~2 month • Turned old sample engine off this month • About a year of testing, many Oracle setup issues • Oracle cluster setup • Updated partitioning • Next • Data reduction: Replace Oracle partitions of old data with reduced channel/sample count

  11. Stuff

  12. Hurdles • Months: Get new Oracle server configured • Interface cards for storage array, fiber switches • Firewall holes for office access, backup, admin • Changes in 10g • SELECT MIN(stamp), MAX(stamp) -> NULL, NULL • No “range” partitioning on Index-Organized-Tables • Configuration issues • ORA-01654: unable to extend … • ORA-00257: archiver error • What used to be impossible is now “easy”, but still expensive • DELETE FROM SAMPLES WHERE …

  13. Configure Sample Engines • Configuration is in RDB • Directly use SQL • EngineConfigImport for legacy config files • View/Edit via web • Hierarchical (as before) • Sampling engine (name, where to run, …) • Groups • Channels • No more duplicate channels!

  14. Other Ideas • Jlab’s MyA • Operational, but • Wrapper code around MySQL to create ‘cluster’ • Handles less meta info (units, limits, …) • Viewer is one-of C++/TCL/Tk • Gabriele Carcassi mentioned RDDTool • Toolset for logging data with data-aging • Command-line RPN tools, web viewer • May be faster than general-purpose RDB • but lacks advantage of gpp RDB

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