1. High Availability in IT Mattias Geniar BarCamp 2010 High Attention High Annoyance High AAAAAARGH

2. High Availability

Introduction

3. Name: Mattias Geniar 4. Twitter: @mattiasgeniar 5. Blog: http://mattiasgeniar.be 6. E-mail: m@ttias.be 7. Job: System Engineer @ Nucleus 8. Walkthrough

What is High Availability?

9. What is downtime 10. How are systems currently built

What are the weak points

11. How can we prevent it What's so annoying about it 12. #define ha

What is high availability?

13. #define ha

What is High Availability?

High availability is asystem design approach and associated service implementation that ensures a prearranged level ofoperational performancewill be met during a contractual measurementperiod .

14. #define ha

What is High Availability?

We can use Facebook, Twitter, Work, Blog, ...

15. #define ha

What is High Availability?

Redundancy All good things come in pairs.

16. #define ha

What is High Availability?

Backup A working backup, when you need it.

17. #define ha

What is High Availability?

Connectivity You can reach your system, when you need it.

18. #define downtime

When is it considered downtime?

19. #define downtime

When is it considered downtime?

When it's unavailable site offline, application unreachable, ...

20. #define downtime

When is it considered downtime?

When it's partially unavailable site is working, but some key functions are malfunctioning

21. #define downtime

When is it considered downtime?

When it's slow to respond users click away on slow sites, get annoyed at loading times, ...

22. #define downtime

When is it considered downtime?

Planned vs Unplanned Is a planned maintenance downtime?

23. #define downtime

What is acceptable?

24. #define downtime

What is acceptable?

Webshop during the night: 30 minutes offline ?

25. #define downtime

What is acceptable?

Business Application during off-hours: 15 minutes offline ?

26. #define downtime

What is acceptable?

Airport during rush hour: 5 minutes offline ?

27. #define downtime

What is acceptable?

Twitter during World Championship: 2 minutes offline ?

28. #define downtime

What is acceptable?

Nuclear Power Plant during scheduled maintenance: 15 seconds offline ?

29. #define downtime

Impact of downtime?

30. #define downtime

Impact of downtime?

Webshop can't sell when they're offline.

31. #define downtime

Impact of downtime?

People ignore you, and move on.

32. #define downtime

Impact of downtime?

Your reputation takes (a) (s)hit.

33. Our savior: High Availability

No more downtime

34. Always on services 35. 24/7 availability 36. Responsive sites 37. = Increase in productivity = WIN? 38. Designing for High Availability

The datacenter

39. #define downtime

What's a datacenter?

A secure area

40. #define downtime

What's a datacenter?

Filled with racks.

41. #define downtime

What's a datacenter?

Who are filled with servers.

42. #define downtime

What's a datacenter?

Which are all kept cool.

43. Designing for High Availability

The typical datacenter design

44. High Availability: Datacenter This should be simple. Building POWER COOLING 45. High Availability: Datacenter UPS Hmm ... Building POWER COOLING POWER COOLING 46. High Availability: Datacenter UPS ... and done! Building POWER COOLING POWER COOLING UPS GENERATOR GENERATOR UPS 47. Designing for High Availability

More than just power & cooling

48. High Availability: Datacenter

Cages or seperate rooms.

49. High Availability: Datacenter

General security

50. Designing for High Availability

Your hosting

51. High Availability: Hosting Right. How hard can this be? INTERNET CONNECTIVITY SERVER 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. Designing for High Availability

Example: very important, high traffic webshop

54. High Availability: Hosting Go get'm Frank! WEBSITE ORDER 55. High Availability: Hosting Holy servers, Batman! FRONTEND FRONTEND FRONTEND LOAD BALANCER LOAD BALANCER STORAGE STORAGE DATABASE DATABASE 56. Designing for High Availability

Doesn't that get messy?

57. High Availability: Hosting

Doesn't that get messy?

Sometimes.

58. High Availability: Hosting

Doesn't that get messy?

But it doesn't have to.

59. Designing for High Availability

That's it for hosting then?

60. High Availability: Hosting

That's it for hosting then?

First, there's backups. Lots of them.

61. High Availability: Hosting

That's it for hosting then?

Monitoring know what's happening.

62. High Availability: Hosting

That's it for hosting then?

Monitoring get alerted.

63. High Availability: Hosting

That's it for hosting then?

Monitoring react. 24/7

64. High Availability: Hosting

That's it for hosting then?

Automate as much as possible.

65. High Availability: Hosting

That's it for hosting then?

Think about every move you make.

66. High Availability: Hosting

That's it for hosting then?

Innovate. Change.

67. High Availability: Hosting

That's it for hosting then?

Eliminate further (hardware) failures.

68. Designing for High Availability

The Application Website, Business App, ...

69. High Availability: Developer

Seperate development environment.

The Application

70. High Availability: Developer

Dedicated & motivated programmers.

The Application

71. High Availability: Developer

Knowledge of underlying systems.

The Application

72. High Availability: Recap

Power

73. Cooling

Internet connectivity

74. Servers

Datacenter

Hosting Provider

Application

Developer

We've got it! 75. High Availability: 99% vs 99,99%

99% availability

76. Monthly downtime: 7,20 hours

99,99% availability

77. Monthly downtime: 4,32 minutes

99,9999% availability

78. Monthly downtime: 2,59 seconds Numbers? 79. Presentation Down Mattias Geniar BarCamp 2010 Thanks for not running away.