Availability: Difference between revisions

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imported>Howard C. Berkowitz
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imported>Howard C. Berkowitz
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Line 5: Line 5:
*1 hour, the period of outage during business hours
*1 hour, the period of outage during business hours
*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==
==References==
{{reflist}}
{{reflist}}

Revision as of 13:33, 30 September 2009

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Availability of an information service, in the context of information security 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

  1. 44 USC 3542