HP SW TL881 DLT Mini-Lib/1 Compaq TL881 MiniLibrary System Users Guide (May 19 - Page 19

The Data Unit, SCSI Interface Configurations, SCSI Bus Performance Considerations, Data Transfer Rate

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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. 1 2 3 4 Figure 1-3. Data Unit Front View 1 16-Cartridge magazine 2 Magazine security lock 3 Control panel 5 6 SHR-1194 4 Unlock /Open button 5 Locked indicator 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.

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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
16-Cartridge magazine
Unlock /Open button
Magazine security lock
Locked indicator
Control panel
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.