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High Availability in IT Mattias Geniar BarCamp 2010 High Attention High Annoyance High AAAAAARGH
High Availability Introduction
Name: Mattias Geniar
Twitter: @mattiasgeniar
Blog: http://mattiasgeniar.be
E-mail: m@ttias.be
Job: System Engineer @ Nucleus
Walkthrough What is High Availability?
What is “downtime”
How are systems currently built What are the weak points
How can we prevent it What's so annoying about it
#define ha What is high availability?
#define ha What is High Availability? 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 .
#define ha What is High Availability? We can use Facebook, Twitter, Work, Blog, ...
#define ha What is High Availability? Redundancy All good things come in pairs.
#define ha What is High Availability? Backup A working backup, when you need it.
#define ha What is High Availability? Connectivity You can reach your system, when you need it.
#define downtime When is it considered downtime?
#define downtime When is it considered downtime? When it's unavailable site offline, application unreachable, ...
#define downtime When is it considered downtime? When it's partially unavailable site is working, but some key functions are malfunctioning
#define downtime When is it considered downtime? When it's slow to respond users click away on slow sites, get annoyed at loading times, ...
#define downtime When is it considered downtime? Planned vs Unplanned Is a planned maintenance “downtime”?
#define downtime What is acceptable?
#define downtime What is acceptable? Webshop during the night: 30 minutes offline ?
#define downtime What is acceptable? Business Application during off-hours: 15 minutes offline ?
#define downtime What is acceptable? Airport during rush hour: 5 minutes offline ?
#define downtime What is acceptable? Twitter during World Championship: 2 minutes offline ?
#define downtime What is acceptable? Nuclear Power Plant during scheduled maintenance: 15 seconds offline ?
#define downtime Impact of downtime?
#define downtime Impact of downtime? Webshop can't sell when they're offline.
#define downtime Impact of downtime? People ignore you, and move on.
#define downtime Impact of downtime? Your reputation takes (a) (s)hit.
Our savior: High Availability No more downtime
“Always on” services
24/7 availability
Responsive sites
= Increase in productivity = WIN?
Designing for High Availability The datacenter
#define downtime What's a datacenter? A secure area
#define downtime What's a datacenter? Filled with racks.
#define downtime What's a datacenter? Who are filled with servers.
#define downtime What's a datacenter? Which are all kept cool.
Designing for High Availability The typical datacenter design
High Availability: Datacenter This should be simple. Building POWER COOLING
High Availability: Datacenter UPS Hmm ... Building POWER COOLING POWER COOLING
High Availability: Datacenter UPS ... and done! Building POWER COOLING POWER COOLING UPS GENERATOR GENERATOR UPS
Designing for High Availability More than just power & cooling
High Availability: Datacenter Cages or seperate rooms.
High Availability: Datacenter General security
Designing for High Availability Your hosting
High Availability: Hosting Right. How hard can this be? INTERNET CONNECTIVITY SERVER
High Availability: Hosting UPS UPS I shouldn't have said that. INTERNET SERVER A NETWORK A INTERNET SERVER C NETWORK B SERVER B
Designing for High Availability Example: very important, high traffic webshop
High Availability: Hosting Go get'm Frank! WEBSITE ORDER
High Availability: Hosting Holy servers, Batman! FRONTEND FRONTEND FRONTEND LOAD BALANCER LOAD BALANCER STORAGE STORAGE DATABASE DATABASE
Designing for High Availability Doesn't that get messy?
High Availability: Hosting Doesn't that get messy? Sometimes.
High Availability: Hosting Doesn't that get messy? But it doesn't have to.
Designing for High Availability That's it for hosting then?
High Availability: Hosting That's it for hosting then? First, there's backups. Lots of them.
High Availability: Hosting That's it for hosting then? Monitoring – know what's happening.
High Availability: Hosting That's it for hosting then? Monitoring – get alerted.

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