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Answering the Database Scale Out Problem: SSDs in the Data Center April 14, 2010

Answering the Database Scale Out Problem: SSDs in the Data Center April 14, 2010 Dan Marriott Director - Production Operations danm@answers.com. Answers.com. The world’s leading Q&A site Rank in top Web properties # 18 in the U.S. (02/2010) (1) # 31 worldwide (02/2010) (1)

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Answering the Database Scale Out Problem: SSDs in the Data Center April 14, 2010

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  1. Answering the Database Scale Out Problem:SSDs in the Data Center April 14, 2010 Dan MarriottDirector - Production Operationsdanm@answers.com

  2. Answers.com • The world’s leading Q&A site • Rank in top Web properties • #18in the U.S. (02/2010)(1) • #31worldwide (02/2010) (1) • Unique monthly visitors • 50 million in the U.S. (02/2010)(1) • 72 million worldwide (02/2010) (1) (1) Source: comScore – Hybrid Measurement Methodology (U.S. only) beginning August 2009

  3. ReferenceAnswers

  4. WikiAnswers: Q&A the Wiki Way

  5. Database layer • MySQL 5.0.87-b20-percona • MySQL 5.0.51a

  6. Challenges • Keep site fast • while site traffic and stored data are ever-increasing • Replication lag = 0 • or users get stale data • Forever being forced to further optimize queries • constantly vying for dev resources to do this • Controlling hardware growth (Cap & OpEx $$$) • regularly adding servers to handle growth

  7. Handling high growth – database tier • Separate reads and writes • Add more read DB slaves • Use Memcached where possible • Optimize Queries • Partition large databases _________ Started hitting a wall: Replication Lag even when servers handling modest # queries/sec

  8. Typical DB read cluster

  9. Fusion-io for HP Blade Servers • March ’09: HP announce IO Accelerator card for blades (manuf. by Fusion-io) • Sizes: • 80 & 160GB SLC • 320GB MLC • April ’09: received two cards – began testing

  10. Easy to install • One man job. Takes 60 secs.

  11. Performance Tests Additionally, CPU load dropped from 30% to 18% (even with Fusion-io driver overhead)

  12. Typical DB read cluster

  13. Fusion-io Value Add for Answers.com • Scalability. >Twice the performance capacity on 1/4 servers • 100% ROI on day of purchase (repurpose other 3/4) • 75% reduction in operating costs: • Rack Space, Power and Cooling • Server Administration • Database Administration • 75% fewer failure points

  14. Other SSD uses in the Data Center • Varnish (Web caching layer) • DB Backup Servers • Log Analysis • Data Warehouse

  15. Thank you. Slideshow: http://tinyurl.com/mysqlconf2010-ssd-dan

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