HP XP7 Storage - Manual (Page 28)

After the installation of HDLM, an LU recognized by a host is called a host LU
(HLU). The areas in a host LU that correspond to the Devs in a storage
system LU are called host devices (HDev).
On a system using HDLM, in order to access a target LU, a drive letter is first
assigned to the disk that has been integrated by the MPIO driver. Such disks
are displayed in the Windows' Disk Management window.
The following figure shows the LU configuration recognized by the host, after
the installation of HDLM.
Figure 2-4 LU Configuration Recognized by the Host After the Installation
of HDLM
The following table lists and describes the components recognized by the
host.
Table 2-3 Components Recognized by the Host
Components Description
HLU An LU that the host recognizes via the HDLM driver. This
type of LU is called a host LU. Regardless of how many
paths are connected to it, only one host LU is recognized
for each LU in the storage system.
HDev A Dev in an LU that the host recognizes via the HDLM
driver. This type of Dev is called a host device.
2-8
HDLM Functions
Hitachi Dynamic Link Manager (for Windows®) User Guide