1 HV Installation and Operations Guide

42 Address Mapping Chapter 2

The indexed addressing table has the structure shown in Table 7 on page 41.

The bridge will allow up to 80 device entries to be mapped. The index table

can be manually edited and is then saved to the bridge FLASH memory. The

Configuration menu has options allowing the table to be filled in order of

increasing bus, target ID, or LUN, as may be desired for the specific

requirements needed.

Options are also provided to perform SCSI device discovery and fill the table

in the order that devices are discovered on a SCSI bus.

Indexed addressing mode is recommended for environments where SCSI

device configuration may change, and a fixed mapping from the application

to the target device is required. That is, if a SCSI device is removed from the

SCSI bus, and the bridge is power cycled, then the FC-to-SCSI addressing for

the remaining SCSI devices will not change and the SCSI devices can be

replaced at the same address. An example of such an environment is where

hot-pluggable devices may be used, thereby changing the order of devices on

a SCSI bus.

Auto Addressing

The auto addressing option is similar to indexed addressing. However, the

table used is created each time through SCSI device discovery upon power-up

(or other bridge initialization process), and is not retained. As the bridge

performs device discovery on a SCSI bus, the table is filled with adjacent FCP

LUNs, referencing each subsequent SCSI device. The host system then detects

every attached device without voids, allowing full device discovery to the host.

This allows easy configuration in environments where device ordering is not

important, and hot plugging of SCSI devices will not occur. Configuration

allows for discovery to be performed in order of bus, target ID or LUN, as

desired for the specific environment.

In auto addressing, bus number order is configured as the default mode on the

bridge.