Setting Up Path Health Checking; Setting Up The Automatic Failback Function - Hitachi XP P9500 User Manual

When you set this value to on, specify rr for round robin or exrr for
extended round robin after the -lbtype option. The type of algorithm
specified by the -lbtype parameter remains stored in the system, even when
you disable the load balancing function by specifying -lb off. Therefore,
when you re-enable the load balancing function without specifying an
algorithm, load balancing will be executed according to the algorithm stored
in the system.

Setting Up Path Health Checking

You can choose whether you want to use path-health-checking function.
The following is an example of how to set up path health checking by using a
command:
# /opt/DynamicLinkManager/bin/dlnkmgr set -pchk on -intvl 10
When path health checking is enabled by specifying on for the -pchk
parameter, you can also specify the -intvl parameter, in order to specify the
checking interval. If the checking interval is not specified, then the previously
specified value will be automatically applied. For example, if you turn off path
health checking after the checking interval was specified as 15 minutes, and
then you enable path health checking again (but without specifying a
checking interval) the 15 value that was specified from before will be used
again.

Setting Up the Automatic Failback Function

When intermittent error monitoring is enabled and the number of error
occurrences is 2 or more, the following condition must be satisfied.
error-monitoring-interval >= checking-interval-for-automatic-
failbacks x number-of-times-an-error-is-to-occur-during-intermittent-
error-monitoring
If this condition is not satisfied, an error will occur and the warning message
KAPL01080-W will be output.
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 needs to occur.
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 setting up automatic failback by using a
command:
# /opt/DynamicLinkManager/bin/dlnkmgr set -afb on -intvl 10
To enable the automatic failback function, set it to on. When on is specified,
you can use the -intvl parameter to specify the checking interval. If the
checking interval is not specified, the value that was previously specified will
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Creating an HDLM Environment
Hitachi Dynamic Link Manager User Guide (for Solaris(R))