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SSD Presentation from WordCamp NYC 2009
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Why SSDs are AwesomeWordCamp NYC 2009
Barry Abrahamson
Me
• Systems Wrangler at Automattic
• Sysadmin, systems architect, DBA
• Used to live in NYC, now live in Ft. Worth, Texas
WordPress.com
• Over 9 million blogs and 11 million users
• 50+ million page views/day
• 1.2 billion queries/day just for post and comment data
• 300+ database servers
Queries per hour
Before
• 4 x 15k RPM SAS drives
• RAID 0
• RAID Controller with BBWC
• $1200
Road to SSDs
• January 2008 - Mtron experiment (FAIL)
• April 2009 - Intel experiment (SUCCESS)
• May 1, 2009 - Production deployment
• May 15, 2009 - Critical bug found
• May 30, 2009 - Start over w/ prod deploy
• July 2, 2009 - Migrations complete!
After
• 1 x Intel X25-M SSD 80GB
• No RAID controller
• $300
http://www.flickr.com/photos/xuoan-dailies/3235208908/
Awesome
• 75% cheaper than fast HDDs + RAID controller
• 6x real-world performance/capacity improvement
• Reliability: 150+ drives in production for 6+ months, only 1 failure.
Less than Awesome
• Saves money and your user’s time, but likely not your (sysadmin’s) time
• Lots of research, tweaking, benchmarking, hacking necessary to achieve maximum performance
• Most software is designed to reduce disk seeks
Contact me!
• barry [ at ] automattic [dot ] com
• http://barry.wordpress.com
Questions!(about whatever you want to ask)