LibraryXpress™
Series
DLT Library Base Module
Models: LXB4X10 and LXB7X10
Installation
and
User Manual
P/N 104126-101
Revision C 1/99
ii
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selected Cipher products. Cipher
is now a brand name of Overland Data, Inc.
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iii
CONTENTS
CHAPTER 1 - INTRODUCTION
..........................................................................
1
Models................................................................................................................. 1
SCSI Interface Configuration.............................................................................. 2
Data Transfer Rates ...................................................................................... 3
Internal Cabling................................................................................................... 3
Physical Configuration........................................................................................ 4
System Expansion ............................................................................................... 4
Features ............................................................................................................... 5
Control Panel ................................................................................................ 5
Display.......................................................................................................... 6
Power Supply................................................................................................ 6
Tape Cartridge Magazine ............................................................................. 6
Integral Fan Cooling ..................................................................................... 8
Library Robotics ........................................................................................... 8
Bar Code Reader........................................................................................... 8
Advanced Design Features.................................................................................. 8
Embedded Diagnostics ................................................................................. 8
Error Checking.............................................................................................. 9
Buffer............................................................................................................ 9
Compression ................................................................................................. 9
Media Life .................................................................................................. 10
Related Publications.......................................................................................... 10
CHAPTER 2 - INSTALLATION
.........................................................................
11
Mechanical Installation ..................................................................................... 11
Desktop Installation.................................................................................... 11
Rack Mount Installation ............................................................................. 12
iv
Interfaces and Cabling ...................................................................................... 16
Power Cable ............................................................................................... 17
SCSI Interfaces........................................................................................... 17
Interface Cable Specifications.................................................................... 18
Terminators ................................................................................................ 19
Interface Cable and Terminator Installation............................................... 20
Configuration .................................................................................................... 21
A Configuration Example - Setting the SCSI ID ....................................... 22
Reserved Slots ............................................................................................ 24
Descriptions of Configuration Options ...................................................... 25
Specifying Customer-Unique Device Identification .................................. 27
CHAPTER 3 - OPERATION
...............................................................................
37
Front Panel........................................................................................................ 37
Power Switch ....................................................................................... 38
Magazine Security Lock ...................................................................... 38
Unlock/Open Button ............................................................................ 38
Locked Indicator LED ......................................................................... 38
Control Panel.............................................................................................. 38
Indicators ............................................................................................. 39
Buttons................................................................................................. 40
Display Messages ................................................................................ 42
Power-On Self Test Screen.................................................................. 42
Initialization Screens ........................................................................... 42
Default Screen ..................................................................................... 42
Control Panel Display Modes........................................................................... 44
The LibraryXpress Menu Structure ........................................................... 44
Entering the Menu Mode............................................................................ 45
Exiting the Menu Mode.............................................................................. 47
Navigating Through the Menu Structure .......................................................... 47
Load/Unload Menu .................................................................................... 47
Show Status Menu...................................................................................... 48
Maintenance Menu..................................................................................... 51
Configure Menu ......................................................................................... 51
Show History Menu.................................................................................... 52
Security Menu ............................................................................................ 52
Displaying Firmware Revision................................................................... 53
Displaying Error Logs ................................................................................ 54
v
Handling the Magazine ..................................................................................... 54
Removing the Magazine ............................................................................. 56
Emergency Magazine Removal .................................................................. 56
Inserting a Magazine Into the Base Module ............................................... 56
Inserting Cartridges Into the Magazine ...................................................... 57
Tape Requirements............................................................................................ 58
Cartridge Handling and Storage........................................................................ 58
Storing Cartridges....................................................................................... 59
If a DLTtape cartridge is dropped .............................................................. 59
Labeling Cartridges .................................................................................... 60
Write Protection.......................................................................................... 60
Loading and Unloading Tapes.................................................................... 61
CHAPTER 4 - MAINTENANCE
.........................................................................
67
Using the Cleaning Cartridge............................................................................ 67
Using the Autoclean Feature ...................................................................... 68
Installing a Cleaning Cartridge................................................................... 68
Running the Cleaning Cartridge ................................................................. 69
Removing the Cleaning Cartridge .............................................................. 71
CHAPTER 5 - TROUBLESHOOTING
..............................................................
73
Diagnosing Problems ........................................................................................ 73
Platform Problems ...................................................................................... 73
General Drive Errors .................................................................................. 73
Error Recovery .................................................................................................. 74
Fault Symptom Codes (FSC) ............................................................................ 75
Using the Demo Submenu................................................................................. 93
APPENDIX A - SPECIFICATIONS
...................................................................
95
APPENDIX B - ACCESSORIES/SPARES/ FRUS
...........................................
101
INDEX
...................................................................................................................
103
vi
Figures
Figure 1-1 Front View............................................................................................... 5
Figure 1-2 Cartridge Magazine ................................................................................. 7
Figure 1-3 Rear View ................................................................................................ 7
Figure 2-1 Rack Slide Parts..................................................................................... 13
Figure 2-2 Separating a Rack Slide......................................................................... 14
Figure 2-3 Rear Panel Connectors, Terminator and Cables.................................... 16
Figure 2-4 Default Screen ....................................................................................... 22
Figure 2-5 Main Menu ............................................................................................ 22
Figure 2-6 Configure Menu..................................................................................... 22
Figure 2-7 Set SCSI Submenu................................................................................. 23
Figure 2-8 Set SCSI Submenu Scrolled .................................................................. 24
Figure 2-9 Set Reserved Slots Menu....................................................................... 25
Figure 2-10 Set Unique ID Screen .......................................................................... 28
Figure 2-11 Setting Unique Vendor ID ................................................................... 28
Figure 3-1 Front Panel............................................................................................. 37
Figure 3-2 Control Panel ......................................................................................... 39
Figure 3-3 POST Screen.......................................................................................... 42
Figure 3-4 Initialization Screen.............................................................................. 42
Figure 3-5 Default Screen ....................................................................................... 43
Figure 3-6 Fault Screen ........................................................................................... 44
Figure 3-7 LibraryXpress Menu Structure .............................................................. 45
Figure 3-8 Main Menu ............................................................................................ 46
Figure 3-9 Front Panel Locked Screen.................................................................... 46
Figure 3-10 Show Status Menu ............................................................................... 48
Figure 3-11 Library Status Submenu ...................................................................... 48
Figure 3-12 Drive Status Submenu ......................................................................... 50
Figure 3-13 Map Info Submenu .............................................................................. 50
Figure 3-14 Code Select Submenu .......................................................................... 52
Figure 3-15 Code Accept Submenu ........................................................................ 53
Figure 3-16 Error History Screen............................................................................ 54
Figure 3-17 Magazine in Place................................................................................ 55
Figure 3-18 Tape Magazine with Cartridges Installed............................................ 57
Figure 3-19 Inspecting Leader of DLTtape Cartridge............................................. 59
Figure 3-20 DLTtape Cartridge Write Protection Switch....................................... 60
vii
Figure 3-21 Default Screen...................................................................................... 61
Figure 3-22 Main Menu........................................................................................... 61
Figure 3-23 Load/Unload Initial Screen .................................................................. 62
Figure 3-24 Load/Unload ‘From’ Entry Screen ...................................................... 63
Figure 3-25 Load/Unload ‘To’ Entry Screen........................................................... 64
Figure 3-26 Confirmation Screen ............................................................................ 64
Figure 3-27 Load/Unload ‘In Progress’ Screen....................................................... 64
Figure 3-28 Updated Default Screen ....................................................................... 65
Figure 4-1 Reserved Slot Numbering ...................................................................... 69
Figure 4-2 Main Menu............................................................................................. 69
Figure 4-3 Maintenance Submenu........................................................................... 70
Figure 4-4 Cleaning Submenu ................................................................................. 70
Figure 4-5 Cleaning Confirmation Screen............................................................... 70
Figure 4-6 Cleaning In Progress Screen .................................................................. 71
Figure 5-1 Troubleshooting Flow Chart .................................................................. 74
Tables
Table 1-1 Data Transfer Rates................................................................................... 3
Table 1-2 Tape Capacities ....................................................................................... 10
Table 1-3 Media Life............................................................................................... 10
Table 2-1 LibraryXpress Configuration Options..................................................... 33
Table 3-1 Control Panel Button Functions .............................................................. 41
Table 3-2 Tape Specifications by DLT Type .......................................................... 58
Table 5-1 Fault Symptom Codes ............................................................................. 75
viii
Chapter 1 - Introduction
1
Chapter 1 - Introduction
The DLT LibraryXpress™ Base Module is the foundation of an expandable,
modular tape library system. The LibraryXpress system is designed for high
duty-cycle on-line and near-on-line applications such as hierarchical storage
management (HSM). It is a superior performer in high-volume backup and
archival service as well.
Models
The complete model number for any of the LibraryXpress modules follows
the pattern shown below:
For the sake of brevity, the different tape drives in LXB modules are
referenced in the manual according to this example:
LXB7110
Chapter 1 - Introduction
2
The Base Module contains one or two DLT drives plus a 10-cartridge
magazine with a rugged random access loader mechanism. The DLT
LibraryXpress Base Module is available in four models:
•
LXB4110
•
LXB4210
•
LXB7110
•
LXB7210.
All models use the high-density DLTtape IV cartridges. DLTtape IV media
is rated at over 1,000,000 head passes. All models can also read and write
DLTtape III and DLTtape III XT cartridges. Write densities are selectable
from the front panel, and under SCSI control from the host.
SCSI Interface Configuration
The DLT LibraryXpress Base Module may be ordered with a choice of
single-ended or differential SCSI-2 interfaces. The LXB4X10, SCSI-2
interface, uses two female, high-density 50-pin D-series connectors per bus.
The LXB7X10, Fast/Wide SCSI Interface uses high-density 68-pin
connectors. The section on
Interfaces
in
Chapter 2 - Installation
describes
the available interface options.
Chapter 1 - Introduction
3
Data Transfer Rates
Table 1-1 Data Transfer Rates
Drive
Technology
Number of
Drives
Maximum
Sustained
Native Rate
MB/second
Maximum
Sustained
Native Rate
GB/hour
DLT 4000 1 (LXB4110) 1.5 5.4
DLT 4000 2 (LXB4210) 3.0 10.8
DLT 7000 1 (LXB7110) 5.0 18
DLT 7000 2 (LXB7210) 10 36
Note
: The rates for compressed data are the native rates multiplied by the
compression factor, which depends on file content, but averages
approximately 2:1.
Note
: GB/hour rates are maximum and may vary due to the specific
characteristics of the data.
The SCSI interface for the library robotics is designed for high-speed
operation, in anticipation of improvements in drive technology. As faster
drives become available, they will be made available for upgrade of the Base
Module.
Internal Cabling
All models are shipped with separate external SCSI connections for the
library robotics and each of the drives. These configurations are described in
more detail in the section on Interfaces in
Chapter 2 - Installation
.
Chapter 1 - Introduction
4
Physical Configuration
All models of the Base Module may be ordered in either rack mount or
desktop configuration. For users who start with a desktop configuration and
later wish to expand, a conversion kit is available to convert a desktop
module to rack mount configuration. Another kit is available for conversion
in the opposite direction. See
Appendix B - Accessories/ Spares/FRUs
for the
part numbers.
System Expansion
A LibraryXpress Base Module may be expanded in capacity or performance
or both by adding a Global Control Module and one or more additional
LibraryXpress modules in a rack mount configuration. Overland Data’s
Smartscale Storage™ architecture enables the robotics in each of the
LibraryXpress modules to exchange cartridges by means of the
XpressChannel™ pass-through cartridge elevator, and integrates the robotics
in the individual modules and the Global Control’s XpressChannel into a
single high-performance library robotics system.
Contact your Overland Data representative for more information about
expanded LibraryXpress systems.
Chapter 1 - Introduction
5
Features
Figures 1-1, 1-2, and 1-3 identify some of the external features of the
LXB4X10 and LXB7X10 Base Modules.
Figure 1-1 Front View
Control Panel
The control panel features a 4-line by 20-character backlit LCD display, four
LED indicators and four buttons. The buttons enable the operator to navigate
through the menu structure to select and display operating modes, device
status, diagnostic and maintenance functions, device history and error
statistics, and system configuration. The functions of the control panel are
described in detail in
Chapter 3 - Operation
.
Chapter 1 - Introduction
6
Display
The backlit 4-line by 20-character control panel display provides a highly
intelligible display of drive and loader status, menu choices and error
messages. The scrolling feature greatly expands the amount of information
available to the operator.
Power Supply
The AC Power switch is located on the front panel of the module. The
autoranging power supply will adjust automatically to either of two
operating voltage ranges. The ranges are 104-120 VAC and 200-254 VAC.
The power supply is capable of operating at 50 or 60 Hz without requiring
any modification. AC power is supplied to the power supply by a single
cable which can be plugged into any properly grounded outlet.
Tape Cartridge Magazine
The ten-cartridge magazine is removable from the front panel, but is
protected from tampering by a key-operated Magazine Security Lock which
must be unlocked before the magazine can be removed. The rugged polymer
magazine fits into an extruded track, which assures precise positioning with
respect to the library robotics. A tape magazine is shown in Figure 1-2.
Insertion and removal of the magazine is described in
Chapter 3 - Operation
.
Chapter 1 - Introduction
7
Figure 1-2 Cartridge Magazine
SC S I
Interface
F an
P ow er
C onnector
G lobal C ontrol Interface
(trace port on stand alone configuration)
Figure 1-3 Rear View
Chapter 1 - Introduction
8
Integral Fan Cooling
The rear panel contains a single forced-air cooling fan. The fan prevents the
drive and robotics electronics, the motors, and the power supply from
overheating.
Library Robotics
The Base Module library robotics can load any of the cartridges from its
removable 10-cartridge magazine into either of two DLTtape drives. Models
LXB4110 and LXB7110 have only one drive per module.
Bar Code Reader
The optional bar code reader is mounted on the cartridge shuttle. It reads bar
code labels attached to each cartridge and maintains the bar code data in
memory as part of the library inventory records. An upgrade kit to add the
bar code reader is available. See
Appendix B - Accessories/ Spares/FRUs
for
the part number.
Advanced Design Features
The DLT LibraryXpress incorporates many significant improvements in tape
drive and library design. The robotics design utilizes Overland Data’s
Mainframe-Class
™ Library Robotics, known for ruggedness and reliability.
Importantly, the Library is designed to use highly reliable DLTtape IV
media. DLTtape IV is rated at over 1,000,000 head passes. DLTtape IV
cartridges are used by all DLT4000 and DLT7000 drives in both multi-
module systems and in standalone libraries.
Embedded Diagnostics
The DLT LibraryXpress Base Module provides three levels of embedded
diagnostics:
1.
The Power-On Self Test (POST)
- Performs various verification tests on
the processor’s host interface and device control functions, as well as
memory tests, at power-up.
Chapter 1 - Introduction
9
2.
User Diagnostics
- Let you change configuration options, and exercise
the robotics under the Demo menu to assist in diagnosing faults.
3.
CE Diagnostics
- Provides more advanced diagnostics to Customer
Engineers (CE) for servicing the Base Module. Both the User
Diagnostics and the CE Diagnostics can be selected from the front panel.
Diagnostics are described in greater detail in
Chapter 2 - Installation
(configuration diagnostics) and
Chapter 5 - Troubleshooting
(remaining user
diagnostics).
Error Checking
To ensure data integrity, the drives in the LXB4X10 and LXB7X10 Base
Modules apply:
•
Reed-Solomon error-correction codes of 16 KB with every 64 KB of
user data
•
A 64-bit cyclic redundancy code (CRC)
•
A 16-bit error-detection code (EDC) for each 4 KB of recorded data
•
An end-to-end 16-bit CRC for each user record.
Buffer
Each drive in an LXB4X10 is equipped with a 2-MB data buffer. Each drive
in an LXB7X10 is equipped with an 8-MB data buffer.
Compression
The drives in the DLT LibraryXpress Base Module use the standard Digital
Lempel-Ziv (DLZ) data compression algorithm.
Chapter 1 - Introduction
10
Capacity
A single Base Module with its ten-cartridge magazine offers formatted
capacities as shown below. When the LXB4X10 uses DLTtape III or IIIXT
cartridges, its capacity is limited accordingly.
Table 1-2 Tape Capacities
Cartridge
Capacity
per Cartridge
A
Full Magazine
Compressed
B
Drive
Model
DLTtape III 10 GB 200 GB LXB4X10
DLTtape III XT 15 GB 300 GB LXB4X10
DLTtape IV 20 GB 400 GB LXB4X10
DLTtape IV 35 GB 700 GB LXB7X10
A
Native capacities, uncompressed.
B
Maximum capacities given assume average 2:1 compression. Actual compression
will vary with file content. The native capacity for a full magazine is ten times the
native capacity per cartridge.
Media Life
Table 1-3 Media Life
DLTtape Type Head Passes Tape Life
III 500,000 20 Years
IIIXT 1,000,000 30 Years
IV 1,000,000 30 Years
Related Publications
For additional information about the LXB4X10 and LXB7X10, and about
the DLT LibraryXpress System product line, refer to the following
publications:
•
DLT Base Module Service Manual, P/N 104127-101
•
DLT Base Module SCSI Specification, P/N 104134-101
•
DLT LibraryXpress System Installation and User Manual, P/N 104139-101
•
DLT LibraryXpress System Service Manual, P/N 104140-101.
Chapter 2 - Installation
11
Chapter 2 - Installation
There are three major steps to complete installation of the DLT
LibraryXpress Base Module:
•
Mechanical installation
•
Cabling
•
Configuration.
Mechanical installation consists of installing the module in a rack (for rack
mounted units). No mechanical installation is required for desktop models.
Cabling consists of connecting the module to the host interface and
terminating the busses properly.
Configuration consists of using the Configure Menu to customize the
configuration options to your particular application if required. The default
settings are often appropriate, and customization is not needed.
Mechanical Installation
Follow the directions in the shipping container to unpack the module and
place it in the desired physical location. Save the packing materials for re-
use in case you need to send the module to Overland Data for repairs.
If the Base Module is to be added to an existing LibraryXpress system,
please refer to the LibraryXpress System Installation and User Manual for
information on mechanical installation.
Desktop Installation
There is no user assembly required. Place the drive on a stable horizontal
surface with at least 2” clearance behind it to allow free flow of cooling air
from the fan.
Chapter 2 - Installation
12
Note:
If the Base Module is to be added to an existing LibraryXpress
subsystem, or if you are expanding an existing desktop Base Module by
adding a Global Control Module and additional LibraryXpress modules, all
modules must be mounted in a rack. A kit is available to convert your
existing desktop model for rack mounting. See Appendix B for ordering
information.
Rack Mount Installation
The Base Module can be mounted in a standard 19-inch EIA/RETMA rack
with a depth of 24 to 30 inches. The rack mount version is shipped with two
rack slides installed.
If the Base Module is to be added to an existing LibraryXpress subsystem,
please refer to the LibraryXpress System Manual for information on
mechanical installation.
Note:
The cooling fan at the rear of the drive must not be obstructed when
the drive is installed in the rack. It is advisable to allow two inches of
clearance behind the rear panel of the module.
CAUTION!
MAKE CERTAIN THAT WHEN THE MODULE IS FULLY
EXTENDED THAT A FORCE OF 20% OF THE RACK
WEIGHT, BUT NOT MORE THAN 57 LB. APPLIED IN
ANY DIRECTION BUT UPWARDS DOES NOT CAUSE
THE RACK TO OVERBALANCE.
VORSICHT:
BITTE BEACHTEN, DAß WAHREND DAS MODUL
AUSGEZOGEN SIND, LEDIGLICH EINE
ZUSÄTZLICHE LAST VON MEHRALS 20% DES
GESTALLGEWICHTES, ABER NICHT MEHR ALS 26
KG IN ALLE RICHTUNGEN AUßER NACH OBEN, DIE
STABILITÄT DES GESTALLS GEFÄHRDET.
Chapter 2 - Installation
13
Note:
All of the screws, washers and nut-plates required for rack mounting
are supplied with the Base Module. The slides must be fastened to the front
rails of the rack using four 10-32
low-profile
screws and the nut-plates
provided. Two 10-32 clip nuts are provided to engage the captive screws on
the front panel.
Follow the instructions below to install the LibraryXpress Base Module into
a rack. You will need a #2 Phillips screwdriver and a flathead screwdriver.
Refer to the figures as directed.
Note:
The left and right slides are alike, so there is no risk of confusing the
parts on re-assembly.
Figure 2-1 Rack Slide Parts
Chapter 2 - Installation
14
1. Refer to Figure 2-1 to identify and orient the parts of the slides.
The slide is attached to the Base Module enclosure by means of
three screws through the inner slide.
2. Refer to Figure 2-2. Separate each set of slides as follows:
a) Pull the outer slide toward the rear, along with the
intermediate slide until the inner slide lock engages the
intermediate slide.
b) Continue to pull the outer slide towards the rear until the outer
slide lock engages the intermediate slide. Press down on the
inner slide
lock to permit the intermediate slide to continue to
move toward the rear. Continue to move the outer and
intermediate slides toward the rear until they are separated
from the inner slide.
Figure 2-2 Separating a Rack Slide
Chapter 2 - Installation
15
3. Locate the screw holes in the front and rear rails of the cabinet or
equipment rack where the drive is to be installed.
4. Loosely assemble a mounting bracket to each outer slide, using two
10-32 screws with washers and a nut-plate for each. Select slots in
the mounting brackets so the length of the assembly equals the
distance between the front and rear rails of the rack.
5. Fasten each outer slide
behind
the front rail of the rack using two
10-32 low-profile screws with washers and one nut plate.
6. Fasten each of the mounting brackets to the
front
of the rear rail of
the rack using two 10-32 screws and one nut plate.
7. Tighten the screws installed in step 4.
8. If they are not already locked, pull the intermediate slides toward
the front (out of the rack) so that they lock in the extended position.
9.
Note:
This step should be performed by two people. In front of the
rack, lift the module to its installed height. Engage the inner slides
mounted on the module with the intermediate slides protruding
from the rack, and slide the module toward the rack until the inner
slide lock engages the intermediate slide. This leaves the entire
module protruding from the rack, locked in position, supported by
slides.
10. Press inward (toward the module) on each of the inner slide locks to
permit the intermediate slides to move toward the rack.
11. Slide the module in and out several times, ensuring that the inner
and outer slide locks engage, and that the module does not bind
against the slides.
12. If binding occurs, loosen the four screws that secure the slides to
the front rails and the four screws that secure the slides to the rear
rails.
13. If necessary, repeat steps 11 and 12 until the module does not bind
against the slides.
Chapter 2 - Installation
16
14. If the rails on your rack are not threaded, install a clip nut on each
front rail at the height of the captive screws on the front panel of the
Base Module. If the rails on your rack are threaded, skip this step.
15. Slide the Base Module into the rack, and tighten the captive screws.
Interfaces and Cabling
Refer to Figure 2-3. If the Base Module is to be installed alone, that is, not as
part of a multi-module subsystem, the connections required are the SCSI
connection to the host, and the AC power connection. The Global Control
interface connector is used only when the module is used in combination
with other modules as part of a DLT LibraryXpress subsystem. If the
Module is to be added to an existing DLT LibraryXpress subsystem, please
refer to the DLT LibraryXpress System Installation and User Manual for
information on cabling.
Figure 2-3 Rear Panel Connectors, Terminator and Cables
Shown with SCSI Jumpers for Daisy-Chained Configuration
Chapter 2 - Installation
17
Power Cable
The AC power cable is a standard grounding AC cable which attaches to a
connector on the rear panel. Connect the cable to the connector on the
module, and connect the other end to a reliably grounded AC outlet or rack
power outlet.
To maintain product safety compliance, use a power cord with a suitable
electrical rating that is approved for the country where the product is used. In
the US, use a UL listed cord; in Canada, a CSA certified cord; and in
Europe, use a Harmonized cord marked <HAR> or a nationally certified
cord.
Note:
After connecting the LibraryXpress Base Module to your AC source,
It is a good practice to power up and test the module before connecting to the
host computer.
SCSI Interfaces
The DLT LibraryXpress Base Module may be ordered with a choice of
single-ended or differential SCSI-2 interfaces. The LXB4X10, Fast SCSI-2
interface, uses two female, high-density 50-pin D-series connectors per bus.
SCSI-2 cables and terminators are secured to the connectors by spring
loaded latches.
The LXB7X10, Fast/Wide SCSI Interface uses high-density 68-pin
connectors. Fast/Wide SCSI cables and terminators are secured to the
connectors by jackscrews.
Both of these SCSI interfaces are provided with independent bus wiring.
That is, each drive has a separate bus, with a pair of SCSI connectors, and
the library robotics has a separate bus, with a pair of SCSI connectors. In this
configuration, there are six SCSI connectors on the rear panel. In the single-
drive models, the connectors labeled DLT 2 are inactive. SCSI jumper cables
can be used for daisy-chained applications.
Each of the drives and the library robotics are separate SCSI devices. Each
requires a unique SCSI address if they are daisy-chained on the same bus.
Chapter 2 - Installation
18
A terminator of the proper type (single-ended or differential) must be
installed on each unused connector of each bus, as explained below in the
section headed ‘Interface Cable and Terminator Installation. Figure 2-3
shows the SCSI cable, connectors and bus terminator used on the module.
In order to connect the module to a host computer system, the host system
must have at least one SCSI controller and the appropriate driver software.
Your Technical Support representative is available to answer your questions
about installation procedures for specific host systems.
Before cabling the system, see the recommended SCSI cable specifications
in the following section. Also, see the section on Interface Cable and
Terminator Installation later in this chapter.
Interface Cable Specifications
The DLT LibraryXpress is a high-performance system. To avoid degradation
of performance, use the highest-qualit