HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software Command Line Interface Reference Guide (EK-G80CL-RA. C01, March 2005)

CLI Command Descriptions

183HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software

Command Line Interface Reference Guide

Note: If a particular host prefers either the CONNECTION_BASED or

HBA_PORT_ID_BASED reservation style, all the connections to that particular host

must have identical reservation style settings.

The most important advantage of this mechanism is allowing various hosts, with

different reservation style requirements, to be connected to the same HSG60 and

HSG80 controllers in a SAN environment.

UNIT_OFFSET

Establishes the beginning of the range of units that a host connection can

access. It is expressed as a decimal value (and is usually just called offset). It

defines and restricts host connection access to a contiguous group of unit

numbers.

If no value is specified for the UNIT_OFFSET switch, then host connections

have default offsets as follows:

■ In Transparent Failover mode, connections on port 1 have an offset of 0

and connections on port 2 have an offset of 100.

■ In Multiple-bus Failover mode, all connections have an offset of 0.

The relationship between LUN number, unit number, and offset is as follows:

■ LUN = unit-number – offset

■ Logical unit-number (LUN) = the logical unit-number presented to the

host connection

■ Unit-number = the number assigned to the unit in the ADD UNITS

command. This is the number by which the unit is known internally to the

controllers.

Example

set !newcon31 operating_system=vms unit_offset=20