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可靠度與維護度定義
本帖最後由 hlperng 於 2014-11-18 14:02 編輯
廣義的可靠度 = 可恃性(dependability)
可靠度=時間品質(quality over time) = 時間性能(performance over time)
可靠度(Reliability)定義:
- the ability of an item to perform a required function under given conditions for a given time interval.
- (software) the ability of equipment to prevent or correct errors.
- (server) the system's ability to operate continuously without failure and to maintain data integrity.
- the probability that an engineering system will perform its intended function satisfactorily (from the viewpoint of the customer) for its intended life under specified environmental and operating conditions.
維護度(Maintainability)定義:
- (general) the ability of an item under given conditions of use, to be retained in, or restored to, a state in which it can perform a required function, when maintenance is performed under given conditions and using stated procedures and resources.
- characteristic of design and installation which determines the probability that a failed equipment, machine, or system can be restored to its normal operable state within a given timeframe, using the prescribed practices and procedures. Its two components are serviceability (ease of conducting scheduled inspections and servicing) and repairability (ease of restoring service after a failure).
- the probability that maintenance of the system will retain the system in, or restore it to, a specified condition within a given time period.
服務度(Serviceability)定義:
- (computer) the measure of and the set of the features that support the ease and speed of which corrective maintenance and preventive maintenance can be conducted on a system.
- (computer) the ease with which system administrators can diagnose problems, detect components likely to fail, and repair failing components within the equipment.
- (server) the time it takes to restore a system to service following a system failure.
可用度(Availability)定義:
- the ability of an item to be in a state to perform a required function under given conditions at a given instant of time or in average over a given time interval, assuming that the required external resources are provided.
- the "uptime" of the equipment, the ability of the equipment to recover from errors, or the ability of the equipment to remain operational during and after an error.
- (server) the ability of a system to recover to an operational state after a failure, with minimal impact.
- the probability that the system is operating satisfactorily at any time, and it depends on the reliability and maintainability.
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