HiCommand Dynamic Link Manager (HDLM) for Windows Systems User's Guide (HIT5201-96001, January 2008)

206 Chapter 6 GUI Reference
Specify whether or not intermittent error monitoring is to be used. To use this function,
select ON; otherwise, select OFF. When you use automatic failback, we recommend that
you set intermittent error monitoring to ON to prevent an intermittent error from
reducing I/O performance.
When you set Intermittent Error Monitor to ON, you can specify the error monitoring
interval and the number of times that an error is to occur. Specifiable values are as
follows:
– Monitoring interval for intermittent errors (in minutes): from 1 to 1440
– Number of times the error is to occur: from 1 to 99
The system assumes that an intermittent error is occurring if the specified number of
times that an error is to occur is reached during the monitoring interval (from the time
that the monitoring interval starts, until the specified interval ends). A path that is
assumed to have an intermittent error is excluded from automatic failback. Intermittent
error monitoring starts when a path recovers from an error through automatic failback.
Monitoring is performed on individual paths.
When Intermittent Error Monitor is set to ON, by default the monitoring interval is 30
and the number of times that an error is to occur is 3.
When a value of 2 or more is specified in Number of times, the following condition must
be satisfied:
error-monitoring-interval >= checking-interval-for-automatic-failback x number-of-
times-error-is-to-occur-during-intermittent-error-monitoring
If this condition is not satisfied, the KAPL02064-W message is output and an error occurs.
In such a case, change any of the following settings; the checking interval for automatic
failback, the intermittent error monitoring interval, or the number of times that an
error is to occur.
If you specify 1 for the number of times that an error is to occur, the above condition
does not need to be satisfied.
During intermittent error monitoring, if changes are made to the settings of the
intermittent error monitoring interval or the number of times that an error is to occur,
the error count and the elapsed time measured since monitoring starts are set to 0.
Then, monitoring starts with the new settings applied.
Outside the duration of intermittent error monitoring, if changes are made to the
settings of the intermittent error monitoring interval or the number of times that an
error is to occur, the new settings take effect after the next time automatic failback
succeeds. Because errors and the elapsed time are counted and measured while
intermittent errors are monitored, those values do not change.
Once the monitoring interval and the number of times that an error is to occur are set,
they remain in effect even if the intermittent error monitoring is subsequently changed
from OFF to ON.
When you click the Apply button in the Options window while intermittent errors are
being monitored, the error count and the elapsed time measured since monitoring starts
are set to 0 even if you have not changed the settings, and monitoring continues.