ATTO Technology 2200R/D, 3200R, 2100R Identifying the SCSI Devices Connected to the FibreBridge

ATTO Technology, Inc. ATTO FibreBridge Installation & Operation Manual

5.Select the Fibre Channel tab from the main window.

5.1.From within the Fibre Channel panel, the FibreBridge can be set to use Hard Addressing if desired. Default = Soft Addressing.

5.2.Select the value of the Hard Address. Default value = 3.

5.3.Set the FibreBridge Soft Fibre LUN to the desired value. Default value = 14

6.Select the Save/Restore Tab within BridgeTools. Select the ‘Save Settings’ option and then the ‘Restart Firmware’ option for the changes to take effect.

Identifying the SCSI Devices Connected to the FibreBridge

As described above, the FibreBridge will be identified by a Bus, Target ID, and LUN. All SCSI devices connected to the bridge will also be identified by the same Bus and Target as the bridge, but will have a unique LUN.

For example, if the FibreBridge is at:	Bus 0, Target 3, LUN 14
A SCSI device connected to that Bridge could be at:	Bus 0, Target 3, LUN 0

The FibreBridge will translate the SCSI device’s Target ID into a Fibre Channel LUN, depending upon the Addressing Mode selected. Refer to the BridgeTools manual and the description of the Fibre Channel to SCSI Address Translation in Appendix A of this manual for details.

The SCSI portion of the bridge acts as a SCSI Initiator and therefore must have an initiator ID. Data going from the bridge to a device requires the format "from ID X to ID Y". This is how the device knows who to respond to on the SCSI bus. This SCSI Initiator Soft ID can also be set using SCSI FibreBridge Services. The default value is 7. This is ideal for most configurations, but it is critical to make sure the SCSI devices that are connected to the bridge are set to different IDs than this initiator ID to avoid device conflicts.

The two SCSI channels on the Bridge are totally independent. You can have both SCSI channels of the bridge set to the same ID and you can have a drive on bridge channel #1 set to ID 0 and also a drive on bridge channel #2 set to 0.

Some operating systems are limited in the number of LUNs they can use. It is best to keep the SCSI device Target ID as low as possible to assure they will be translated into a LUN between 0 and 31. For example, if there are eight SCSI devices to be connected to the bridge, connect four of them to FibreBridge SCSI Bus 1 and set their IDs to 0, 1, 2 and 3. Connect the remaining four devices to FibreBridge SCSI Bus 2 and set their IDs to 0, 1, 2 and 3. With the default Address Translation method of the bridge, these devices will be translated into Fibre Channel LUNs 0 through 7.

ATTO Technology, Inc.

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