HP XP7 Storage - Manual (Page 41)

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For using the dynamic load balance controller function there are
restrictions on the versions of the microprograms you install. For details,
see the release notes of HDLM.
Dynamic I/O Path Control Function
In a storage system in which the dynamic load balance controller function is
installed, enable the dynamic I/O path control function to make the HDLM
load balancing effective.
When the dynamic I/O path control function is enabled, the controller
selected by the dynamic load balance controller function is recognized as the
owner controller. Other controllers are recognized as non-owner controllers.
The dynamic I/O path control function can be enabled or disabled based on
each host, connected storage system, or LU.
The dynamic I/O path control function can be specified by using the HDLM
command's set operation. For details about the set operation, see set (Sets
Up the Operating Environment) on page 6-16 .
Error Management
For troubleshooting purposes, HDLM collects information and stores it into log
files. The following figure shows the flow of data when error information is
collected on a host which is running HDLM.
HDLM Functions
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