Availability: Difference between revisions
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imported>Howard C. Berkowitz (New page: '''Availability''' of an information service means that authorized users can depend on being able to use it whenever it is needed. In U.S. law, a definition is "Ensuring timely and reliabl...) |
imported>Howard C. Berkowitz No edit summary |
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*7 hours, the actual period the service was unusable ''if'' someone attempted to use it | *7 hours, the actual period the service was unusable ''if'' someone attempted to use it | ||
*17 hours, the perceived period of outage if someone saw it fail and left for the day, not knowing he could respect it in the morning | *17 hours, the perceived period of outage if someone saw it fail and left for the day, not knowing he could respect it in the morning | ||
==References== | |||
{{reflist}} | |||
Revision as of 16:36, 13 September 2009
Availability of an information service means that authorized users can depend on being able to use it whenever it is needed. In U.S. law, a definition is "Ensuring timely and reliable access to and use of information." [1]
To specify availability in detail, however, can be quite complex. For example, if a service is offered only during normal business hours between 9 and 5, the service fails at 4, is repaired at 11, and is working the next morning, has it been unavailable for:
- 1 hour, the period of outage during business hours
- 7 hours, the actual period the service was unusable if someone attempted to use it
- 17 hours, the perceived period of outage if someone saw it fail and left for the day, not knowing he could respect it in the morning
References
- ↑ 44 USC 3542