HP Hitachi Dynamic Link Manager Software Licenses - Manual (Page 65)

For details on cluster software supported by HDLM, the supported Solaris
version, and usable volume management software, see Combinations of
Cluster Software and Volume Managers Supported by HDLM on page 3-7 .
HDLM uses a path of the active host to access an LU.
Paths are switched in units of physical paths. Therefore, if an error occurs in a
path, all the other paths that run through the same physical path are
switched. The switching destination is a physical path of the active host. The
details of host switching depend on the application.
Note
When you use HDLM in a cluster configuration, you must install the same
version of HDLM on all the nodes that comprise the cluster. If different
versions of HDLM are installed, the cluster system might not operate
correctly. If the HDLM Version and Service Pack Version, which are
displayed by executing the following command, are the same, the
versions of HDLM are the same:
# /opt/DynamicLinkManager/bin/dlnkmgr view -sys
HDLM Functions
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Hitachi Dynamic Link Manager (for Solaris) User Guide