HiCommand Dynamic Link Manager (HDLM) for Windows Systems User's Guide (HIT5201-96001, January 2008)

70 Chapter 3 Creating an HDLM Environment
3.5.2.1 Setting Load Balancing
You can select whether to enable load balancing. In a cluster environment, the load
balancing function is only available for TagmaStore, Thunder 9200/9500V Series, and
Lightning 9900/9900V Series, TagmaStore, and Universal Storage Platform V. In a non-cluster
environment, the load balancing function is available for TagmaStore, Thunder 9200/9500V
Series, Lightning 9900/9900V Series, Universal Storage Platform V, and the EMC DMX series.
The above-mentioned conditions are applied regardless of the settings for the EMC DMX
series, EMC CX series, and HP EVA series. For example, in a cluster environment, the load
balancing function is disabled even if it is set to be enabled for the EMC DMX series. For
details on the cluster software supported by HDLM, see section
2.12.
 Setting by using the Options window
Set it ON to enable load balancing. Otherwise, set it to OFF. After selecting ON, select a
desired algorithm to be used for load balancing from the pull-down list.
 Setting by using the set operation, the following is an example of a command to set
load balancing.
>dlnkmgr set -lb on -lbtype rr
Set load balancing to on to enable load balancing. Otherwise, set it to off. 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 load balancing without specifying an
algorithm, load balancing will be executed according to the settings stored in the
system.
3.5.2.2 Setting Path Health Checking
You can select whether to enable path health checking.
 Setting by using the Options window.
Set it to ON to enable path health checking. Otherwise, set it to OFF. When selecting
ON, you can specify Checking interval for path health checking.
 Setting by using the set operation.
The following is an example command to set path health checking.
>dlnkmgr set -pchk on -intvl 10
To enable path health checking, set it to on. Otherwise, set it to off. When you set this
value to on, you can use the -intvl parameter to specify the checking interval. The
value that was specified previously will be applied if the checking interval is not
specified. For example, specify the path health check as off after specifying the
checking interval as 15 minutes and executing. Then, when executing after specifying
the path health check as on without specifying the checking interval, the 15 minutes
that were specified previously will be applied again.