MTTR - Mean Time To
Repair /Response
MTTF - Mean Time to
Failure
MTTD - Mean Time to
Detect/Diagnose
Metrics Used in Availability Management
There are a number
of measures used to assess and report the performance of a service or component in respect of it being available.
Availability is defined as the ability of a
service or component to perform its required function when needed. It is
usually calculated as a percentage.
Availability = MTBF/(MTBF+MTTR)
Reliability is a measure of how long a service
or component can perform its required function without interruption. It is
calculated using the metrics Mean Time between System Incidents & Mean Time
to Restore Services.
Maintainability is a measure of how quickly a
service or component can be restored to its working state after a failure.
Note: Availability,
reliability and maintainability measures all need to include a time interval,
typically hours.
Serviceability is a measure of a third-party
provider’s ability to meet their contracted support commitments in terms of
availability, reliability and maintainability.
Failure : Any system that cannot meet minimum
performance or availability requirements can be considered as failed.
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