When a LUN is added to a storage group for masking purposes, it is given a default HLU value, different from the LUN value (ALU), that is visible to the host. The default HLU value can be changed to a user-defined value. HLU corresponds to the LUN address you see on the host. ALU is the LUN number you see in Navisphere.
What are HLU/ALU numbers in a storage group?  HLU/ALU Pairs:     HLU Number     ALU Number   ----------     ----------     0               201     1               203     2               202     3               29     4               205     5               204     6               206     7               207     8               10     9               5     11              208     12              210     13              209     14              211     15              212     16              8     17              9     18              14     19              16     20              0     21              17     22              92     23              19     24              7     25              91     26              90     27              15     28              28     29              18     10              31     30              26     31              32     32              36     33              39     34              48     35              51     36              52 Shareable:             YES
HLU/ALU numbers