HP Compaq StorageWorks TL881 DLT Mini-Library - Manual (Page 19)

Introduction 1-5
The Data Unit
The Data Unit (Figure 1–3) has a 16-cartridge magazine, a random access
robotic mechanism, and no tape drives. The module robotics, under control of
the Expansion Unit, moves cartridges between the Pass-Thru Mechanism and
any of the 16 cartridge storage locations.
SHR-1194
1
2
3
4
6
5
Figure 1-3. Data Unit Front View
1 16-Cartridge magazine 4 Unlock /Open button
2 Magazine security lock 5 Locked indicator
3 Control panel 6 Power switch
SCSI Interface Configurations
Systems are equipped with DLT 20/40 drives use a narrow SCSI interface
using high-density 68-pin D-series connectors. The section on SCSI Interfaces
in Chapter 3, Installation, describes the available interface options.
SCSI Bus Performance Considerations
Data Transfer Rate
The data transfer rate of the MiniLibrary is dependent on the type and number
of drives and on the SCSI bus configuration. The bandwidth of the SCSI bus is
limited. As a result, the transfer rate of drives such as the DLT20/40 can be
limited by sharing a SCSI bus with another disc drive on tape. It is
recommended that the MiniLibrary be installed on its own controller for
optimum performance.