Property:Availability

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This is a Quality Attribute document

Document icon Availability Version: 0.1 OIAr logo
Document type: Quality Attribute Owner:

J.A.H. Schoonderbeek



A facility's/products Availability, denoted as a single string, determines to what degree a facility/product is functioning correctly, and is able to provide sufficient capacity to handle requested use in a timely fashion (within pre-defined service windows). In general, the more robust a facility of product is built, the higher the degree of availability that can be guaranteed. The most common practices in enhancing robustness are the use of redundant components to construct a facility, and/or using a redundant set of facilities to construct a product.

Defined values for Availability:

ordinal value meaning
0 NS no availability specified
10 Best-Effort the operation of a facility/solution is not safe-guarded against incidents and disasters
20 Medium the operation of a facility/solution is unaffected by incidents
30 High the operation of a facility/solution is unaffected by incidents and disasters

The table below provides an overview of these classes and the provisions that should be made to get a facility or Product in a certain class:

Provision Best-Effort Medium High
Single facility/solution, on a single location X X
Redundant or highly resilient facility/solution,
on a single location
X
Redundant facility/solution, on two or more locations X
Fail-over none manual, active-passive automatic, active-active
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