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.
Read more about this topic: High Availability
Famous quotes containing the words reasons for and/or reasons:
“I should like to know what is the proper function of women, if it is not to make reasons for husbands to stay at home, and still stronger reasons for bachelors to go out.”
—George Eliot [Mary Ann (or Marian)
“... to a poet, the human community is like the community of birds to a bird, singing to each other. Love is one of the reasons we are singing to one another, love of language itself, love of sound, love of singing itself, and love of the other birds.”
—Sharon Olds (b. 1942)