HP Hitachi Dynamic Link Manager Software - Manual (Page 57)

2. HDLM Functions
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2.9.3 Intermittent Error Monitoring Actions
Intermittent error monitoring is performed on each path, and it automatically starts as
soon as a path is recovered from an error by using the automatic failback function.
This subsection describes the following intermittent error monitoring actions:
• When an intermittent error occurs
• When an intermittent error does not occur
• When the conditions for an intermittent error to occur are changed during error
monitoring
(1) When an Intermittent Error Occurs
When an error occurs on a path a specified number of times within a specified interval,
the error monitoring will finish and the path is determined to have an intermittent error,
upon which the path is removed from those subject to automatic failbacks. The path
that is removed will remain in the error status until the
online
operation is performed.
However, if the path satisfies certain conditions (see Figure 2-11: Path Status
Transitions), it will be subject to automatic failbacks and change to the
Online
status.
Figure 2-12: Action What Will Happen When an Intermittent Error Occurs on a Path
shows what will happen when an intermittent error occurs. For this example, the path
is determined to have an intermittent error when the error occurs 3 or more times
within 30 minutes. The events that occur are described by using the time arrows.
Figure 2-12: Action What Will Happen When an Intermittent Error Occurs on a
Path