Hitachi Dynamic Link Manager, User Manual

Page: 445 / 746

6. Command Reference
421
on
: Enabled
off
: Disabled
Intermittent error monitoring can be set automatic failback is set to
on
.
The default is
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.
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 30 minutes, and the
number of times that the error is to occur is set to 3.
• When the intermittent error monitoring interval or the number of times that
the error is to occur has been specified before:
The values specified from the last time are used.
When a value of 2 or more is specified for the 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 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 failback, 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.
The following shows the sub-parameters that should be specified: the error
monitoring interval and the number of times that the error is to occur:
-intvl
error-monitoring-interval