High Availability can be a curiously nebulous term, and most people probably don't care about it until they can't access their online banking service, or their plane crashes.
This presentation examines some of the considerations necessary when building highly available computer systems, then focuses on the HA infrastructure software currently available from the Corosync/OpenAIS, Linux-HA and Pacemaker projects.
Originally presented at Linux Users Victoria in April 2010 (http://luv.asn.au/2010/04/06)
6. What is High Availability? “ High availability is a system design protocol and associated implementation that ensures a certain degree of operational continuity during a given measurement period.” http://en.wikipedia.org/wiki/High_Availability
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8. Decrease MTTR (redundant hardware + software) What is High Availability? Availability = MTTF MTTF + MTTR
9. What is High Availability? (hopefully your hardware is better than this)