Spectra Logic 10000 manual Selecting the Mode of Library Operation, Single Bus Mode

Chapter 3. Preparing the Library

Selecting the Mode of Library Operation

A SCSI library can operate in either single-bus or dual-bus mode.

Note: The following information on single-bus and dual-bus libraries only applies to SCSI libraries.

For more information on SE/LVD libraries, see Selecting a SCSI Bus for the Library (SCSI Libraries Only) on page 22.

Single Bus Mode

If you want to use only one host with one SCSI controller, operate the library in either one of these single-bus configurations:

Option	Settings	SCSI Cabling
If you have a	Set the rear panel Library SCSI ID	Terminate SCSI Port 1 Out.
single-ended library	switch to a unique ID.	Attach host SCSI cable to SCSI Port 1 In.
with one to two drives.	Set the SCSI Bus 2 ID setting to OFF.	Ensure that drives are installed in Drive Slots 1 and 2.
If you have a	Set the rear panel Library SCSI ID	Use the six-inch external SCSI link (P.N. 4531) to connect
differential library	switch to a unique ID.	SCSI Port 1 Out to SCSI Port 2 In.
(HVD or LVD) with three	Set the SCSI Bus 2 ID setting to OFF.	Attach host SCSI cable to SCSI Port 1 In.
to four drives.		Terminate SCSI Port 2 Out or attach a SCSI cable to the
		input of another SCSI device.

If the library is the last device on the SCSI bus, connect terminators to the SCSI output connectors. If the library connects to another SCSI device, connect the SCSI cable from the output of the library to the next SCSI device. Terminate the SCSI output of the final device on the SCSI bus.

If you have decided to operate in single-bus mode, the next step is to set the library SCSI ID. See Setting SCSI IDs on page 36.

Note: If you have a single-ended library with three or four installed drives, you must operate the library in dual-bus mode. See The SCSI Bus on page 118 for details on SCSI bus lengths.

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