HP XP P9500 Storage User Manual
Page 212
Automatic failbacks are performed on the following types of paths:
¢
Paths where an error occurred and for which the KAPL08022-E
message was displayed.
¢
Path where an error occurred during the startup of the HDLM
manager.
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
Table 6-5 Relationship Between the Setting for the Automatic
Failback Function and Intermittent Error Monitoring and the Executable
for the relationship between automatic
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:
¢
When the checking interval has not been specified before:
Every minute (default setting)
¢
When the checking interval has been specified before:
The previously used interval
The explanation for the following sub-parameter describes how to specify
the interval between path status checks.
-intvl checking-interval
Specify the interval between path status checks. Specify a value from
1 to 1440 minutes. 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, the
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 change 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.
6-22
Command Reference
Hitachi Dynamic Link Manager User Guide for Windows
®