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High availability in IT: AAAARGH


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My Barcamp presentation (#bca4) on High Availability, and how much energy and frustration it costs to implement it. In Dutch.

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High availability in IT: AAAARGH

  1. 1. High Availability in IT Mattias Geniar BarCamp 2010 High Attention High Annoyance High AAAAAARGH
  2. 2. High Availability <ul><li>Introduction
  3. 3. Name: Mattias Geniar
  4. 4. Twitter: @mattiasgeniar
  5. 5. Blog:
  6. 6. E-mail:
  7. 7. Job: System Engineer @ Nucleus </li></ul>
  8. 8. Walkthrough <ul><li>What is High Availability?
  9. 9. What is “downtime”
  10. 10. How are systems currently built </li><ul><li>What are the weak points
  11. 11. How can we prevent it </li></ul><li>What's so annoying about it </li></ul>
  12. 12. #define ha <ul><li>What is high availability? </li></ul>
  13. 13. #define ha <ul><li>What is High Availability? </li></ul><ul>High availability is a system design approach and associated service implementation that ensures a prearranged level of operational performance will be met during a contractual measurement period . </ul>
  14. 14. #define ha <ul><li>What is High Availability? </li></ul><ul>We can use Facebook, Twitter, Work, Blog, ... </ul>
  15. 15. #define ha <ul><li>What is High Availability? </li></ul><ul>Redundancy All good things come in pairs. </ul>
  16. 16. #define ha <ul><li>What is High Availability? </li></ul><ul>Backup A working backup, when you need it. </ul>
  17. 17. #define ha <ul><li>What is High Availability? </li></ul><ul>Connectivity You can reach your system, when you need it. </ul>
  18. 18. #define downtime <ul><li>When is it considered downtime? </li></ul>
  19. 19. #define downtime <ul><li>When is it considered downtime? </li></ul><ul>When it's unavailable site offline, application unreachable, ... </ul>
  20. 20. #define downtime <ul><li>When is it considered downtime? </li></ul><ul>When it's partially unavailable site is working, but some key functions are malfunctioning </ul>
  21. 21. #define downtime <ul><li>When is it considered downtime? </li></ul><ul>When it's slow to respond users click away on slow sites, get annoyed at loading times, ... </ul>
  22. 22. #define downtime <ul><li>When is it considered downtime? </li></ul><ul>Planned vs Unplanned Is a planned maintenance “downtime”? </ul>
  23. 23. #define downtime <ul><li>What is acceptable? </li></ul>
  24. 24. #define downtime <ul><li>What is acceptable? </li></ul><ul>Webshop during the night: 30 minutes offline ? </ul>
  25. 25. #define downtime <ul><li>What is acceptable? </li></ul><ul>Business Application during off-hours: 15 minutes offline ? </ul>
  26. 26. #define downtime <ul><li>What is acceptable? </li></ul><ul>Airport during rush hour: 5 minutes offline ? </ul>
  27. 27. #define downtime <ul><li>What is acceptable? </li></ul><ul>Twitter during World Championship: 2 minutes offline ? </ul>
  28. 28. #define downtime <ul><li>What is acceptable? </li></ul><ul>Nuclear Power Plant during scheduled maintenance: 15 seconds offline ? </ul>
  29. 29. #define downtime <ul><li>Impact of downtime? </li></ul>
  30. 30. #define downtime <ul><li>Impact of downtime? </li></ul><ul>Webshop can't sell when they're offline. </ul>
  31. 31. #define downtime <ul><li>Impact of downtime? </li></ul><ul>People ignore you, and move on. </ul>
  32. 32. #define downtime <ul><li>Impact of downtime? </li></ul><ul>Your reputation takes (a) (s)hit. </ul>
  33. 33. Our savior: High Availability <ul><li>No more downtime
  34. 34. “Always on” services
  35. 35. 24/7 availability
  36. 36. Responsive sites
  37. 37. = Increase in productivity = WIN? </li></ul>
  38. 38. Designing for High Availability <ul><li>The datacenter </li></ul>
  39. 39. #define downtime <ul><li>What's a datacenter? </li></ul><ul>A secure area </ul>
  40. 40. #define downtime <ul><li>What's a datacenter? </li></ul><ul>Filled with racks. </ul>
  41. 41. #define downtime <ul><li>What's a datacenter? </li></ul><ul>Who are filled with servers. </ul>
  42. 42. #define downtime <ul><li>What's a datacenter? </li></ul><ul>Which are all kept cool. </ul>
  43. 43. Designing for High Availability <ul><li>The typical datacenter design </li></ul>
  44. 44. High Availability: Datacenter This should be simple. Building POWER COOLING
  45. 45. High Availability: Datacenter UPS Hmm ... Building POWER COOLING POWER COOLING
  46. 46. High Availability: Datacenter UPS ... and done! Building POWER COOLING POWER COOLING UPS GENERATOR GENERATOR UPS
  47. 47. Designing for High Availability <ul><li>More than just power & cooling </li></ul>
  48. 48. High Availability: Datacenter <ul>Cages or seperate rooms. </ul>
  49. 49. High Availability: Datacenter <ul>General security </ul>
  50. 50. Designing for High Availability <ul><li>Your hosting </li></ul>
  51. 51. High Availability: Hosting Right. How hard can this be? INTERNET CONNECTIVITY SERVER
  52. 52. High Availability: Hosting UPS UPS I shouldn't have said that. INTERNET SERVER A NETWORK A INTERNET SERVER C NETWORK B SERVER B
  53. 53. Designing for High Availability <ul><li>Example: very important, high traffic webshop </li></ul>
  54. 54. High Availability: Hosting Go get'm Frank! WEBSITE ORDER
  56. 56. Designing for High Availability <ul><li>Doesn't that get messy? </li></ul>
  57. 57. High Availability: Hosting <ul><li>Doesn't that get messy? </li></ul><ul>Sometimes. </ul>
  58. 58. High Availability: Hosting <ul><li>Doesn't that get messy? </li></ul><ul>But it doesn't have to. </ul>
  59. 59. Designing for High Availability <ul><li>That's it for hosting then? </li></ul>
  60. 60. High Availability: Hosting <ul><li>That's it for hosting then? </li></ul><ul>First, there's backups. Lots of them. </ul>
  61. 61. High Availability: Hosting <ul><li>That's it for hosting then? </li></ul><ul>Monitoring – know what's happening. </ul>
  62. 62. High Availability: Hosting <ul><li>That's it for hosting then? </li></ul><ul>Monitoring – get alerted. </ul>
  63. 63. High Availability: Hosting <ul><li>That's it for hosting then? </li></ul><ul>Monitoring – react. 24/7 </ul>
  64. 64. High Availability: Hosting <ul><li>That's it for hosting then? </li></ul><ul>Automate as much as possible. </ul>
  65. 65. High Availability: Hosting <ul><li>That's it for hosting then? </li></ul><ul>Think about every move you make. </ul>
  66. 66. High Availability: Hosting <ul><li>That's it for hosting then? </li></ul><ul>Innovate. Change. </ul>
  67. 67. High Availability: Hosting <ul><li>That's it for hosting then? </li></ul><ul>Eliminate further (hardware) failures. </ul>
  68. 68. Designing for High Availability <ul><li>The Application Website, Business App, ... </li></ul>
  69. 69. High Availability: Developer <ul>Seperate development environment. </ul><ul><li>The Application </li></ul>
  70. 70. High Availability: Developer <ul>Dedicated & motivated programmers. </ul><ul><li>The Application </li></ul>
  71. 71. High Availability: Developer <ul>Knowledge of underlying systems. </ul><ul><li>The Application </li></ul>
  72. 72. High Availability: Recap <ul><li>Power
  73. 73. Cooling </li></ul><ul><li>Internet connectivity
  74. 74. Servers </li></ul><ul><li>Datacenter </li></ul><ul><li>Hosting Provider </li></ul><ul><li>Application </li></ul><ul><li>Developer </li></ul>We've got it!
  75. 75. High Availability: 99% vs 99,99% <ul><li>99% availability
  76. 76. Monthly downtime: 7,20 hours </li></ul><ul><li>99,99% availability
  77. 77. Monthly downtime: 4,32 minutes </li></ul><ul><li>99,9999% availability
  78. 78. Monthly downtime: 2,59 seconds </li></ul>Numbers?
  79. 79. Presentation Down Mattias Geniar BarCamp 2010 Thanks for not running away.