HP XP Racks - Manual (Page 25)

LU Configuration
On a system using HDLM, the logical device file for the HDLM management-
target device is used to access the target LU.
An LU recognized by a host after HDLM installation, is called a host LU (HLU).
The areas in a host LU that correspond to the Dev in a storage system LU are
called host devices (HDev).
An LU in the storage system corresponds one-to-one with a host LU, a host
device, or an hdisk.
The following figure shows the LU configuration recognized by the host, after
the installation of HDLM.
Figure 2-2 LU configuration of the host where HDLM is installed and
correspondence with an hdisk
The following table lists and describes the components recognized by the
host.
Table 2-2 Components recognized by the host
Components Description
HLU An LU that the host recognizes via the HDLM driver. It is
called a host LU. No matter how many paths exist, one
host LU is recognized for one LU in the storage system.
HDev A Dev in an LU that the host recognizes via the HDLM
driver. It is called a host device. No matter how many
paths exist, one host device is recognized for one Dev in
the storage system.
HDLM Functions
2-5
Hitachi Dynamic Link Manager User Guide for AIX®