Spectra Logic 10000 - Manual (Page 30)

Chapter 3. Preparing the Library
30
Dual Bus Mode
If you want to use two hosts, or if you have a library (either single-ended or
differential) with three or four installed drives and want the fastest transfer rate
possible, operate the library in either of these dual-bus configurations:
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.
Note: It is possible to connect 8-bit (narrow) SCSI devices to the 16-bit
(wide) SCSI connectors on the library, as long as the library is the
first device after the host on the SCSI bus.
Adapters are available that terminate the upper eight bits of the
wide SCSI bus and interface 68-pin micro-SCSI connectors to 50-
pin SCSI connectors (see SCSI Cables and Terminators on page
119).
See The SCSI Bus on page 118 for details of SCSI bus configuration.
If you have decided to operate the library in dual-bus configuration with two hosts, see
Split-Bus Configuration on page 31.
Option Settings SCSI Cabling
If you have a
single-ended or
differential library and
want to use one host... Set the rear panel Library SCSI
ID switch to a unique ID.
Set the SCSI Bus 2 ID setting to
to a unique ID. Terminate SCSI Port 1 Out.
Attach Host A SCSI cable to SCSI Port 1 In.
Terminate SCSI Port 2 Out.
Attach Host A SCSI cable to SCSI Port 2 In.
The host must have two SCSI controller cards—one for each
input.
If you have a
single-ended or
differential library and
want to use two hosts
(dual logical library
operation)... Set the rear panel Library SCSI
ID switch to a unique ID.
Set the SCSI Bus 2 ID setting to a
unique ID.
Configure Library 2 slots setting. Terminate SCSI Port 1 Out.
Attach Host A SCSI cable to SCSI Port 1 In.
Logical Library 1 has exclusive rights to Drives 1 and 2 on SCSI
Port 1.
Terminate SCSI Port 2 Out.
Attach Host B SCSI cable to SCSI Port 2 In.
Logical Library 2 has exclusive rights to Drives 3 and 4 on SCSI
Port 2.