HP Hitachi Dynamic Link Manager Software - Manual (Page 168)

3. Creating an HDLM Environment
144
(1) Setting Up Load Balancing
In a cluster environment, the load balancing function is only available for the Thunder
9500V series, Lightning 9900 series, Lightning 9900V series, Hitachi USP, Hitachi
AMS2000/AMS/WMS/SMS series, Universal Storage Platform V/VM, and Virtual
Storage Platform. In a non-cluster environment, the load balancing function is
available for the Thunder 9500V series, Lightning 9900 series, Lightning 9900V
series, Hitachi USP, Hitachi AMS2000/AMS/WMS/SMS series, Universal Storage
Platform V/VM, Virtual Storage Platform, and EMC DMX series. For the EMC DMX
series, EMC CX series, and HP EVA series, these conditions are applied regardless of
whether or not the load balancing function is enabled in those series. For example, in
a cluster environment, the load balancing function is disabled even if you try to enable
it for the EMC DMX series. For details on the cluster software supported by HDLM,
see 2.14 Cluster Support.
• Setting up load balancing by using the
set
operation
The following is an example of how to set up load balancing by using a command:
>dlnkmgr set -lb on -lbtype exlio
When load balancing is enabled by specifying
on
for the
-lb
parameter, specify
one of the following algorithm values after the
-lbtype
parameter:
•
rr
for the Round Robin algorithm
•
exrr
for the Extended Round Robin algorithm
•
lio
for the Least I/Os algorithm
•
exlio
for the Extended Least I/Os algorithm
•
lbk
for the Least Blocks algorithm
•
exlbk
for the Extended Least Blocks algorithm
The type of algorithm specified by the
-lbtype
parameter remains stored in the
system, even if, you disable the load balancing function by specifying
-lb off
.
If you decide to re-enable load balancing at a later time, and you do not specify
an algorithm, load balancing will still be executed by using the algorithm that was
previously specified.
(2) Setting Up Path Health Checking
You can choose whether you want to use path health checking.
• Set up path health checking by using the
set
operation
The following is an example of how to set up path health checking by using a
command: