HP XP P9500 Storage - Manual (Page 255)

# /opt/DynamicLinkManager/bin/dlnkmgr set -afb on -intvl 10
To enable automatic failback, specify on. Specify off otherwise. When you
specify on, you can use the -intvl parameter to specify the checking interval
can be specified with the -intvl parameter when on is specified. The value
that was specified previously will be applied if the checking interval is not
specified. For example, specify auto failback as off after specifying the
checking interval to five minutes and executing. Then, when executing after
specifying auto failback as on without specifying the checking interval, the
five minutes that were specified previously will be applied again.
Setting Up Intermittent Error Monitoring
Intermittent error monitoring is specifiable only when the automatic failback
function is enabled. To prevent an intermittent error from reducing I/O
performance, we recommend that you monitor intermittent errors when
automatic failback is enabled.
When intermittent error monitoring is enabled, you can specify intermittent
error conditions. The default value for the intermittent error-monitoring
interval is 30. The default value for the number of error occurrences is 3.
The system assumes that an intermittent error has occurred if the specified
number of times that the error needs to occur is reached during the specified
monitoring interval. A path that is assumed to have an intermittent error is
excluded from performing an automatic failback. Intermittent error
monitoring starts right when the path is recovered from the error by
performing an automatic failback. Monitoring is performed on each, individual
path.
When a value of 2 or more is specified for the number of times an error
needs to occur, make sure that the condition described in Setting Up the
Automatic Failback Function on page 3-186 is satisfied.
To determine whether a path is invalid for an automatic failback, you can use
the results of the dlnkmgr command's view operation.
The following is an example of using a command to enable intermittent error
monitoring:
# /opt/DynamicLinkManager/bin/dlnkmgr set -iem on -intvl 20 -iemnum 2
To enable intermittent error monitoring, specify on. To disable intermittent
error monitoring, specify off. When you specify on, you can use the -intvl
and -iemnum parameters to specify intermittent error conditions (the
conditions used by the system to determine whether an intermittent error is
occurring). In the -intvl parameter, specify the monitoring interval for an
intermittent error. In the -iemnum parameter, specify the number of times
that the error is to occur. When these parameters are omitted and 3 or more
errors occur within 30 minutes, the system assumes that an intermittent
error is occurring.
Creating an HDLM Environment
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Hitachi Dynamic Link Manager User Guide (for Linux(R))