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| ====== Reliability Criterion ====== | ====== Reliability Criterion ====== |
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| [[private:99_annexes:annex-b-terms-and-definitions:start|Go up to Terms and Definitions]] | [[public:99_annexes:annex-b-terms-and-definitions:start|Go up to Terms and Definitions]] |
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| ===== Discussion ===== | ===== Discussion ===== |
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| A **Reliability Criterion** provides a measurable basis for assessing the [[private:99_annexes:annex-b-terms-and-definitions:r:reliability|Reliability]] of an entity. It identifies a condition against which the performance of a specified function can be evaluated under specified operating conditions and for a specified period of time. | A **Reliability Criterion** provides a measurable basis for assessing the [[public:99_annexes:annex-b-terms-and-definitions:r:reliability|Reliability]] of an entity. It identifies a condition against which the performance of a specified function can be evaluated under specified operating conditions and for a specified period of time. |
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| A Reliability Criterion may establish a threshold, tolerance, permitted interruption, response time, capacity, error rate, recovery objective, or another measurable condition. The criterion may distinguish required operation, permitted degraded operation, and failed operation. | A Reliability Criterion may establish a threshold, tolerance, permitted interruption, response time, capacity, error rate, recovery objective, or another measurable condition. The criterion may distinguish required operation, permitted degraded operation, and failed operation. |
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| Reliability Criteria may be derived from an applicable [[private:99_annexes:annex-b-terms-and-definitions:r:requirement|Requirement]], [[private:99_annexes:annex-b-terms-and-definitions:p:policy|Policy]], [[private:99_annexes:annex-b-terms-and-definitions:c:constraint|Constraint]], profile, agreement, or decision issued by an [[private:99_annexes:annex-b-terms-and-definitions:a:authority|Authority]]. Each criterion retains its governing source, applicability, identity, [[private:99_annexes:annex-b-terms-and-definitions:v:version|Version]], and [[private:99_annexes:annex-b-terms-and-definitions:p:provenance|Provenance]]. | Reliability Criteria may be derived from an applicable [[public:99_annexes:annex-b-terms-and-definitions:r:requirement|Requirement]], [[public:99_annexes:annex-b-terms-and-definitions:p:policy|Policy]], [[public:99_annexes:annex-b-terms-and-definitions:c:constraint|Constraint]], profile, agreement, or decision issued by an [[public:99_annexes:annex-b-terms-and-definitions:a:authority|Authority]]. Each criterion retains its governing source, applicability, identity, [[public:99_annexes:annex-b-terms-and-definitions:v:version|Version]], and [[public:99_annexes:annex-b-terms-and-definitions:p:provenance|Provenance]]. |
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| ===== Definition ===== | ===== Definition ===== |
| ===== Note ===== | ===== Note ===== |
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| A Reliability Criterion is the measurable condition used for an assessment. [[private:99_annexes:annex-b-terms-and-definitions:r:reliability|Reliability]] is the quality characteristic being assessed. An operational state is the observed condition of the assessed entity. An operational failure occurs when the entity does not satisfy an applicable Reliability Criterion. | A Reliability Criterion is the measurable condition used for an assessment. [[public:99_annexes:annex-b-terms-and-definitions:r:reliability|Reliability]] is the quality characteristic being assessed. An operational state is the observed condition of the assessed entity. An operational failure occurs when the entity does not satisfy an applicable Reliability Criterion. |
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| A Reliability Criterion does not prescribe a particular monitoring, redundancy, clustering, replication, failover, recovery, or storage mechanism. Those mechanisms are implementation choices unless required by the governing source. | A Reliability Criterion does not prescribe a particular monitoring, redundancy, clustering, replication, failover, recovery, or storage mechanism. Those mechanisms are implementation choices unless required by the governing source. |
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| When applicable Reliability Criteria conflict, the conflict remains explicit and is referred to the appropriate [[private:99_annexes:annex-b-terms-and-definitions:a:authority|Authority]]. The test environment does not invent precedence among conflicting criteria. | When applicable Reliability Criteria conflict, the conflict remains explicit and is referred to the appropriate [[public:99_annexes:annex-b-terms-and-definitions:a:authority|Authority]]. The test environment does not invent precedence among conflicting criteria. |
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| ===== Example ===== | ===== Example ===== |