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An update on the Cached BDII

June 08, 2011. An update on the Cached BDII. Lorenzo Dini – WLCG Information Officer. Overview. To Cache Or Not To Cache How the cache impacts on the service What are the benefits on stability Tests performed on production-like hardware Non-Cached: lcg-bdii.cern.ch

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An update on the Cached BDII

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  1. June 08, 2011 An update on theCached BDII Lorenzo Dini – WLCG Information Officer

  2. Overview • To Cache Or Not To Cache • How the cache impacts on the service • What are the benefits on stability • Tests performed on production-like hardware • Non-Cached: lcg-bdii.cern.ch • Production DNS round-robin • Cached: clcg-bdii.cern.ch • Dedicated test service with 4-day cache enabled • Same hardware as any node of lcg-bdii.cern.ch Lorenzo Dini

  3. Content Dump (seconds) Average time: 5.4 seconds faster Lorenzo Dini

  4. Total Objects Average overhead: 3% (4500 objects) Lorenzo Dini

  5. Objects Added/Removed All objects Average improvement: 46X Lorenzo Dini

  6. Objects Added/Removed No GlueLocationLocalID Average improvement: 28X Lorenzo Dini

  7. Added/Removed per type No GlueLocationLocalID Lorenzo Dini

  8. Conclusions • No query performance degradation • Small size overhead (3% in object number) • Stability highly improved (28X – 46X) • Ready for Prime Time! • Next steps • Functional testing by experiments • Introduce it to the lcg-bdii DNS round-robin • Cache enabled by default in production Lorenzo Dini

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