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Property
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Description
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Reliability/availability evaluation
The properties under this heading provide information needed for reliability and availability calculation.
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From start time
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The starting time for the calculation in hours. The start time and end time specify the time range for the calculation. This range of time is intended to represent the period of time that the system is operating.
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Through end time
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The end time for the calculation in hours.
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Number of data points
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The number of calculations to perform within the specified period of time. For instance, if the range of time is from 0 to 300, and the number of data points is 3, then 3 calculations run in 300 hours. In this example, calculations run at 0 hours, 150 hours, and 300 hours.
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Display results for states at time
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The results at this time are shown on the Markov Calculation results page in the View Calculation Results window after calculations are completed. They appear under Results for time < value >. They are also shown in the Markov Results label if it is inserted in the diagram.
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Required capacity
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The throughput, profit, or reward required for a degraded state to be classified as a good state. If the capacity of a degraded state is less than the value entered here, the state is classified as a failed state. If the capacity is equal to or greater than this value, the degraded state is classified as a good state.
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Precision
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The precision that the Markov calculation engine is to use in calculating results. The default is 0.0001. However, you can select another item from the list or enter any other value.
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Diagram verification
The single property under this heading provide for specifying whether a warning should appear if non-failed absorbing states exist.
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Warn on the presence of non-failed absorbing states
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If absorbing states that are non-failed (or good) exist, then the system cannot fail once it reaches these states. This means that system reliability as time tends to infinity is not zero and MTTF (mean time to failure) becomes infinity. This situation is not realistic for most situations. When this checkbox is selected (default), a window opens, indicating the existence of such states.
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