HP StorageWorks HSG80 ACS Solution Software V8.8 for HP-UX Installation and Configuration Guide (AA-RV1FA-TE, March 2005)

Planning a Subsystem
60 HSG80 ACS Solution Software V8.8 for HP-UX Installation and Configuration Guide
For example:
In Figure 17, assume all host connections initially have the default offset of 0.
Giving all connections access to host BLUE, an offset of 120 presents unit D120
to host BLUE as LUN 0. Enter the following commands:
SET BLUE1A1 UNIT_OFFSET=120
SET BLUE1B1 UNIT_OFFSET=120
SET BLUE2A2 UNIT_OFFSET=120
SET BLUE2B2 UNIT_OFFSET=120
Host BLUE cannot see units lower than its offset, so it cannot access any other
units. However, the other two hosts can still access D120 as LUN 20 if their
operating system permits. To restrict access of D120 to only host BLUE, enable
only host BLUE’s access, as follows:
SET D120 DISABLE_ACCESS_PATH=ALL
SET D120 ENABLE_ACCESS_PATH=(BLUE1A1,BLUE1B1,BLUE12A2,BLUE2B2)
Note: HP recommends that you always provide access to only specific connections.
This way, if new connections are added, they do not have automatic access to all units.
Note: See "Restricting Host Access by Disabling Access Paths", page 55.
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 incremented 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