Compaq StorageWorks HSG60 ACS Solution Software V8.6 for Linux X86 and Alpha Installation and Configuration Guide

Planning a Subsystem 1–21
NOTE: It is highly recommended that you still give access to only specific connections, even if
there is just one connection on the link. That way, if new connections are added, they will not
have automatic access to all units.
Worldwide Names (Node IDs and Port IDs)
A worldwide name—also called a node ID—is a unique, 64-bit number assigned to a
subsystem prior to shipping. The node ID belongs to the subsystem itself and never
changes.
Each subsystem’s node ID ends in zero, for example 5000-1FE1-FF0C-EE00. The
controller port IDs are derived from the node ID.
In a subsystem with two controllers in transparent failover mode, the controller port IDs
are incriminated as follows:
■ Controller A and controller B, port 1—worldwide name + 1, for example
5000-1FE1-FF0C-EE01
■ Controller A and controller B, port 2—worldwide name + 2, for example
5000-1FE1-FF0C-EE02
Use the CLI command, SHOW this_controller/other_controller to display the subsystem’s
worldwide name.
Restoring Worldwide Names (Node IDs)
If a situation occurs that requires you to restore the worldwide name, you can restore it
using the worldwide name and checksum printed on the sticker on the frame into which
the controller is inserted.
Figure 1–10 shows the placement of the worldwide name label for the Model 2100
enclosure.