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BehindtheScenesat MySpace.com DanFarino ChiefSystemsArchitect dan@myspace.com Friday,November21,20081 Topics •Architectureoverviewand history •ThestuffIgettoworkon(in theWindowsworld) •Monitoring •Administraon 2 Friday,November21,20082 Topics •Windows?! •It’sagoodserver(nowleaveme alone.) •However,theseleconoftoolsfor large‐scalemanagementisabit sparse... 3 Friday,November21,20083 Wherewestarted Friday,November21,20084 Wherewestarted •Theidealgrowthscenario •Plan •Implement •Test •Golive •Monitorandcollectopsdata •Repeat 5 Friday,November21,20085 Wherewestarted •Ourgrowthscenario: •Implement •Golive •Andwhilethosearehappening overandover: •Rebootservers •Throwhardwareatperformanceissues •“Shotgundebugging” 6 Friday,November21,20086 Wherewestarted “Shotgundebugging”: Shotgundebuggingisaprocessof makingrelavelyundirectedchanges tosowareinthehopethatabug willbeperturbedoutofexistence. 7 Friday,November21,20087 Wherewestarted •Whywouldanyone“shotgun debug”? •Don’treallyknowhowtoanalyze anddebugaproblem •Needtoresolvetheproblemnow andcollecngdataforanalysis wouldtaketoolong 8 Friday,November21,20088 Wherewestarted •Webservers •Windows2000Server •IIS5.0 •ColdFusion5 •Databaseservers •Windows2000Server •SQLServer2000 9 Friday,November21,20089 Wherewewere •Operaonally •Batchfilesandrobocopyforcode deployment •“psexec”forremoteadminscript execuon •WindowsPerformanceMonitorfor monitoring 10 Friday,November21,200810 Wherewewere •Anysortofformal,automated QAprocess? •No. 11 Friday,November21,200811 Currentarchitecture Friday,November21,200812 Currentarchitecture •4,500+webservers •Windows2003/IIS6.0/ASP.NET •1,200+“cache”servers •64‐bitWindows2003 •500+databaseservers •64‐bitWindows2003 •SQLServer2005 13 Friday,November21,200813 QAtoday •Unittests/automatedtesng •Weslldon’t“fuzz”thesite nearlyasthoroughlyasour usersdothough •Therearesllproblemsthat happenonlyinproducon 14 Friday,November21,200814 QAtoday •Wene