HP XP P9500 Storage - Manual (Page 27)

LU Configuration
After you have properly installed HDLM, the LU configuration will change as
follows:
Before the installation of HDLM:
The host recognizes that an sd or ssd device is connected to each physical
path.
Thus, a single LU in the storage system is recognized as the same
number of LUs as that of physical paths.
After the installation of HDLM:
An HDLM device that corresponds one-to-one with the Dev in an LU in the
storage system is created above an sd or ssd device.
Thus, from the host, LUs in the storage system are also recognized as one
LU regardless the number of physical paths.
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 (slice or partition)
in a storage system LU are called host devices (HDev).
On a system using HDLM, the logical device file for the HDLM device is used
to access the target LU instead of the logical device file for the sd or ssd
device.
The logical device files for sd or ssd are deleted by HDLM.
The following figure shows the LU configuration recognized by the host, after
the installation of HDLM.
HDLM Functions
2-5
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