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Chapter 2. Installing the Library
14
Attaching to the Host Computer
Follow this procedure to connect the library as the only unit on a SCSI bus. To attach
more than one SCSI device, read Attaching More than One SCSI Device on page 18, as
well as the documentation for the other device(s) on the bus.
About the SCSI IDs and the SCSI Bus
The library communicates with the host computer through a system of cables and
connectors called the Small Computer System Interface (SCSI). The library uses an
extremely fast version of SCSI called Ultra Wide SCSI, which can connect up to 16
devices in a series. Each SCSI device requires a unique SCSI ID. The library contains
either two or three SCSI devices:
•Library robotics
•Drive 1
•Drive 2 (optional)
The library requires one SCSI ID for the library robotics and one SCSI ID per drive for
a maximum of three possible SCSI IDs. The factory SCSI ID settings work correctly for
most SCSI bus configurations.
Note: Don’t change the default settings for the library’s SCSI IDs unless
necessary; see Attaching More than One SCSI Device on page 18.
LVD/SE or Differential SCSI Interface
The library is available with either an LVD/SE or differential SCSI interface. You will
need to purchase the appropriate terminator for that interface—the LVD/SE library
requires an active, multimode LVD/SE terminator, and the differential unit requires a
differential terminator.
If you are not sure about the interface for your library, you can determine it in one of
two ways:
1. Locate the SCSI interface label between the two SCSI connectors on the back
panel of the library (Figure 2-4).