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
previous 202050100250500next 20
Showing 17 pages using this property.
P
PAV.Application Hosting.Cloud - Internal Access Only Best Effort +
Best-Effort  +
PAV.Asynchronous Message Handling.ESB +
NS  +
PAV.Authentication+Authorization.Internal users +
NS  +
PAV.Authentication+Authorization.Local +
NS  +
PAV.Data Management. Cloud – Internal Use +
NS  +
PAV.Data Transport.Public +
NS  +
PAV.Facilities Deployment.Vendor Market +
NS  +
PAV.File Storage.Local +
NS  +
PAV.User Workspace.Corporate Central +
NS  +
PAV.User Workspace.Tablet +
NS  +
PAV.Workflow Orchestration.Common Cloud Application Direction +
NS  +
Q
Quality Attribute NS +
NS  +
S
SE.BV.Centralized Logging.SAP +
Medium  +
SE.BV.Centralized Monitoring.SAP +
Medium  +
ST.ENV.Off-Site +
NS  +
ST.ENV.On Site +
NS  +
ST.ENV.Remote +
NS  +
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{
    "type": "PROPERTY_CONSTRAINT_SCHEMA",
    "constraints": {
        "type_constraint": "_txt",
        "allowed_values": [
            "NS",
            "Best-Effort",
            "Medium",
            "High"
        ]
    }
}
Retrieved from "https://www.infra-repository.org/oiar-2013/index.php?title=Property:Availability&oldid=95"