Hitachi Dynamic Link Manager Software Users Guide for AIX (7.6)

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.
-iem { on [-intvl
error-monitoring-interval] [-iemnum number-of-times-
error-is-to-occur] | off }
Enables or disables intermittent error monitoring.
on: Enabled
off: Disabled
Intermittent error monitoring can be enabled only when automatic
failback is set to on.
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.
If on is specified, be sure to also specify the intermittent error monitoring
interval and the number of times that the error is to occur. The system
assumes that an intermittent error is occurring if the specified number of
times that the error is to occur is reached during the monitoring interval.
A path that is assumed to have an intermittent error is excluded from
automatic failbacks. Intermittent error monitoring is performed on each
path. Intermittent error monitoring starts when a path is recovered from
an error by performing an automatic failback.
If you omit the intermittent error monitoring interval or the number of
times that the error is to occur, each setting is specified as follows:
¢
When the intermittent error monitoring interval or the number of
times that the error is to occur has not been specified before:
The intermittent error monitoring interval is set to 210 minutes, and
the number of times that the error is to occur is set to 3.
6-24
Command Reference
Hitachi Dynamic Link Manager User Guide for AIX
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