Hitachi XP P9500 User Manual page 340

To prevent intermittent errors from deteriorating I/O performance, we
recommend that you also enable intermittent error monitoring when the
automatic failback function is enabled. Intermittent error monitoring is
specifiable only when automatic failbacks are enabled.
For details on the relationship between automatic failbacks and
intermittent error monitoring, see
Setting for the Automatic Failback Function and Intermittent Error
Monitoring and the Executable Operations on page
When you specify on, specify the checking interval by specifying the
parameter immediately following on. If you do not specify a checking
interval, path statuses will be checked in the following way:
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The explanation for the following sub-parameter describes how to specify
the interval between path status checks.
-intvl checking-interval
6-22
When the checking interval has not been specified before:
Every minute (default setting)
When the checking interval has been specified before:
The interval specified in the last time
Specify the interval between path status checks. Specify a value from
1 to 1440 minutes. The default is 1. Specify an interval appropriate for
your operating environment.
If intermittent error monitoring is on and the number of times that the
error is to occur is set to a value of 2 or more, 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 KAPL01080-W message will be
output and an error will occur. If this happens, change any of the
following settings: the checking interval for automatic failbacks,
intermittent error-monitoring interval, or the number of times that the
error is to occur.
When you set the number of times that the error is to occur to 1, the
above condition does not need to be satisfied.
When you changed the error monitor interval during monitoring an
intermittent error, the new setting takes effect immediately. When the
checking interval is shortened and the checking interval time after the
change has already elapsed during the current checking interval, the
path status check will start over.
This setting remains stored in the system, even if you disable the
function by changing the setting of automatic failbacks to off.
Therefore, if you re-enable automatic failbacks and do not change the
interval, path status checks will be executed at the interval already
stored in the system.
Command Reference
Hitachi Dynamic Link Manager User Guide (for Solaris(R))
Table 6-5 Relationship Between the
6-25.