Users Guide

Appendix 47
Devices Tab
The Devices tab of Target Properties screen provides generic device details
like the virtual disks that are associated with Target.
Click Advanced to view information about MPIO and launch the Device
Details screen.
You can use the MPIO tab to modify the MPIO settings. On this tab, you can
select the appropriate Load Balance Policy settings. You can configure Load
balancing for each connection from the different Load Balance Policy options
that are available. When you select each policy in the Load Balance Policy
field of the MPIO tab, the following descriptions are displayed on the screen:
• Fail Over Policy — The fail over policy employs one
active path and designates all other paths as
standby. The standby paths will be tried on a
round-robin approach upon failure of the active
path until an available path is found
.
•
Round Robin — The round robin policy attempts to
evenly distribute incoming requests to all
possible paths
.
•
Round Robin With Subset — The round robin subset policy
executes the round robin policy only on paths
designated as active. The stand-by paths will be
tried on a round-robin approach upon failure of
all active paths.
• Least Queue Depth — The least queue depth policy
compensates for uneven loads by distributing
propeortiaonately more I/O requests to lightly
loaded processing paths.
• Weighted Paths — The weighted paths policy allows the
user to specify the relative processing load of
each path. A large number means that the path
priority is low.
The default option is Round Robin. Select the required option from the
Load Balance Policy drop-down menu to configure the Load Balance Policy
and click Apply to confirm your setting.