Hitachi XP P9500 User Manual page 224

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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.
See
Failback Function and Intermittent Error Monitoring and the Executable
Operations on page 6-25
failbacks and intermittent error monitoring.
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
Path where an error occurred during the startup of the HDLM
manager.
Table 6-5 Relationship Between the Setting for the Automatic
When the checking interval has not been specified before:
Every 60 minute (default setting)
When the checking interval has been specified before:
The previously used interval
Specify the interval between path status checks. Specify a value from
1 to 1440 minutes. The default is 60. 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 × 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 while intermittent error
monitoring is running, the new settings will take 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 AIX(R))
for the relationship between automatic