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Chapter 3 Functions of NEC Storage PathManager
It is possible to confirm that static load balancing is in effect once the -path option is applied to the logical
unit 1.
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In this method, loads are distributed by dynamically changing the paths to be used among multiple paths.
LUN0
LUN1
Path
0
Path
1
Figure 3-6 Dynamic load balancing
Use the -lbmode option of the spscmd to make settings for dynamic load balancing. The following image
shows an example.
C:\>spscmd -getlun
*** LogicalUnit #0 ***
> 0: Priority=2, PathNumber=4:0:0:0
1: Priority=1, PathNumber=5:0:1:0
C:\>spscmd -lbmode 4:0:0:0 1
C:\>spscmd -getlun
+++ LogicalUnit #0 +++ [round robin]
> 0: Priority=2, PathNumber=4:0:0:0
1: Priority=1, PathNumber=5:0:1:0
C:\>
In this example, the path to logical unit 0 which exists in NEC Storage is used in dynamic load balancing.
Use the first argument in the -lbmode option to specify a path number of the logical unit to execute
dynamic load balancing. Then use the second argument to specify the method of load balancing. Settings
III-14