High Availability - Reasons For Unavailability

Reasons For Unavailability

A survey among academic availability experts in 2010 ranked reasons for unavailability of enterprise IT systems, from most to least important, as follows:

Causal factor of unavailability
Lack of best practice change control
Lack of best practice monitoring of the relevant components
Lack of best practice requirements and procurement
Lack of best practice operations
Lack of best practice avoidance of network failures
Lack of best practice avoidance of internal application failures
Lack of best practice avoidance of external services that fail
Lack of best practice physical environment
Lack of best practice network redundancy
Lack of best practice technical solution of backup
Lack of best practice process solution of backup
Lack of best practice physical location
Lack of best practice infrastructure redundancy
Lack of best practice storage architecture redundancy

The factors themselves are based on the work of Evan Marcus and Hal Stern.

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