HP Hitachi Dynamic Link Manager Software - Manual (Page 298)

3. Creating an HDLM Environment
274
If you set the number of times that the error needs to occur to
1
, the above condition
does not need to be satisfied.
The following is an example of using a command to enable automatic failback:
# /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.
(4) 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 (3) Setting Up the Automatic Failback
Function 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