Specifications

3–17
Compaq HSG80 Array Controller ACS Version 8.4 Configuration and CLI Reference Guide
Restoring Worldwide Names (Node IDs)
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 controllers, 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.
When you remove a controller to replace it in a dual-redundant configuration, the
remaining controller remembers the subsystem worldwide name (node ID). When
you install the replacement controller, the remaining controller tells the new controller
the worldwide name; the replacement controller assumes the correct port ID numbers.
If you have a single controller configuration, you must have a save configuration disk
if you want to be able to automatically restore the worldwide name in the event of a
failure. In this case the controller could read the worldwide name from the save
configuration disk.
If a situation occurs that requires you to restore the worldwide name, you can restore
it using the worldwide name and check sum printed on the sticker on the frame into
which your controller is inserted. See the command, “SET controller,” page 7–91 for
details about setting the worldwide name (node ID).
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 reinitialized. Use the SHOW
command to list the LUN ID.