HP Hitachi Dynamic Link Manager Software - Manual (Page 53)

HiCommand ® Dynamic Link Manager (HDLM) for Windows ® Systems User’s Guide 37
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When an intermittent error occurs.
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When an intermittent error does not occurs.
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When the conditions for the intermittent error are changed during error monitoring.
2.8.3.1 When an Intermittent Error Occurs
When an error occurs in a path the specified number of times within the specified interval,
the error monitoring finishes, the path is determined to have an intermittent error, and then
the path is removed from those items subject to automatic failback. The path that is
removed from the paths that are subject to automatic failback has an error status until the
online operation is performed properly. However, if the path satisfies certain conditions, it
will be subject to automatic failback and change to online (Online). For details on the
conditions, see Figure 2.11.
Figure 2.12 shows the action for intermittent error monitoring when an intermittent error
occurs. In this example, the path is determined to have an intermittent error when the error
occurs 3 or more times in 30 minutes. The event occurred in one path is described on the
time arrow.
Figure 2.12 Action when an Intermittent Error Occurs in the Path
2.8.3.2 When an Intermittent Error Does Not Occur
If an error does not occur in the path the specified number of times within the specified
interval, an intermittent error does not occur. In this case, the error monitoring finishes
when the specified error monitoring interval finishes and the number of errors is reset to 0.
If an error occurs in the path later, the error monitoring resumes at the time the path is
recovered from the error by using automatic failback.
If errors occur after a long interval, an intermittent error can be detected by increasing the
error monitoring interval or by decreasing the number of times that the error is to occur (in
order for the system to determine that an intermittent error is occurring).