HP Hitachi Dynamic Link Manager Software - Manual (Page 33)

2. HDLM Functions
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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.