HP Array Controller HSG V8.7 Software - Manual (Page 105)

Creating Storagesets 3–27
Unit World Wide Names (LUN IDs)
In addition, each unit has its own world wide name, or LUN ID. This is
a unique, 128-bit value that the controller assigns at the time of unit
initialization. It cannot be altered by the user but does change when the
unit is re-initialized. Use the SHOW command to list the LUN ID.
Caution Each subsystem has its own unique worldwide name (node
ID). This ID can be found on a sticker, which is located on top of the
frame that houses the controller(s), the EMU, the PVA, and cache
modules. If you attempt to set the subsystem worldwide name to a
name other than the one that came with the subsystem, the data on the
subsystem will not be accessible. Never set two subsystems to the same
worldwide name, or data corruption will occur.