DEC StorageWorks TZ8x7 Series Configuration And Installation Manual
StorageWorksSolutions
TZ8x7-SeriesTapeDriveSCSIBus
ConfigurationandInstallationGuide
Order Number: EK–TZ8X7–IG. A01
This document contains instructions for planning and installing SCSI
buses for TZ8x7-series tape drives in StorageWorks cabinets.
Digital Equipment Corporation
Maynard, Massachusetts
January 1994
While Digital believes the information included in this publication is correct as of the date of
publication, it is subject to change without notice.
Digital Equipment Corporation makes no representations that the interconnection of its products
in the manner described in this document will not infringe existing or future patent rights, nor
do the descriptions contained in this document imply the granting of licenses to make, use, or sell
equipment or software in accordance with the description.
NOTE: This equipment generates, uses, and may emit radio frequency energy. The equipment has
been type tested and found to comply with the limits for a Class A digital device pursuant to Part
15 of the FCC rules. These limits are designed to provide reasonable protection against harmful
interference in a residential installation.
© Digital Equipment Corporation 1994
Printed in U.S.A.
All rights reserved.
Digital, StorageWorks, and the DIGITAL logo are trademarks of Digital Equipment Corporation.
This document was prepared using VAX DOCUMENT Version 2.1.
TZ8x7-Series Tape Drive SCSI Buses
This chapter presents general information on the arrangement and cabling
of TZ8x7-series tape drive Small Computer System Interface (SCSI) buses in
StorageWorks™ cabinets.
1.1 TZ8x7-Series Tape Drive SCSI Buses
TZ8x7-series tape drives are used in either storage-only or controller/storage
cabinet configurations.
1.1.1 Storage-Only Cabinet Configurations
In a storage-only cabinet configuration, the controller for devices in the cabinet is
located outside the cabinet. Typical SCSI bus arrangements for TZ8x7-series tape
drives in StorageWorks storage-only cabinets are shown in Figure 1–1.
From one to four TZ8x7-series tape drives may be installed in a storage-only
cabinet. The tape drives may be configured on one or more SCSI buses. The units
are serially connected using an adapter cable and one or more jumper cables,
and a host cable connects the tape drive bus structure within the cabinet to an
external host. A terminator is installed on the last tape drive on the bus.
1
There are three host SCSI bus configurations normally used with StorageWorks
storage-only cabinets:
• If the host uses a single-ended interface and is near enough to the storageonly cabinet not to violate SCSI bus length restrictions, it may be connected
directly to the tape drive bus within the cabinet.
• If the host uses a differential interface and is distant (relative to the
maximum allowable SCSI bus length) from the storage-only cabinet, it must
be connected to the tape drive bus using a DWZZA–AA SCSI signal converter.
The signal converter must be mounted next to or inside the storage-only
cabinet. The differential bus allows the host to be farther away than does
the single-ended one. The signal converter translates the differential bus into
a single-ended bus acceptable by the tape drives. In this configuration, the
host must operate in the 8-bit differential mode to function properly with the
signal converter.
• If the host uses a single-ended interface and is distant (relative to the
maximum allowable SCSI bus length) from the storage-only cabinet, it
must be connected to the tape drive bus using two DWZZA–AA SCSI signal
converters. One signal converter must be mounted next to or inside the
storage-only cabinet, and the other near the host. The two back-to-back
signal converters act as a bus extender, to allow a greater distance between
the host and the storage-only cabinet.
TZ8x7-Series Tape Drive SCSI Buses 1–1
Figure 1–1 Storage-Only Cabinet SCSI Bus Arrangements
REAR PANEL
SCSI
CONNECTORS
H8574A
TERMINATOR
StorageWorks CABINET
TZ8x7-SERIES
TAPE DRIVE
TZ8x7-SERIES
TAPE DRIVE
BC19J-1E
JUMPER CABLE
(.5 METER LENGTH)
HOST
(NEAR)
TZ8x7-SERIES
TAPE DRIVE
SINGLE-ENDED INTERFACE
DWZZA-AA
SCSI SIGNAL
CONVERTER
TZ8x7-SERIES
TAPE DRIVE
CONTROLLER CABLE
(BN21H-xx SCSI A
CABLE-LENGTH TO
SUIT APPLICATION)
17-03831
ADAPTER
CABLE
(.2 METER
LENGTH)
DWZZA-AA
SCSI SIGNAL
CONVERTER
BN21K
OR
BN21L
SCSI P CABLE
(DIFFERENTIAL
INTERFACE)
BN21H-xx
SCSI A CABLE
(SINGLE-ENDED
INTERFACE)
CXO-4049A-MC
SCSI P CABLE
(DIFFERENTIAL
HOST
(DISTANT)
BN21K
OR
BN21L
INTERFACE)
DWZZA-AA
SCSI SIGNAL
CONVERTER
HOST
(DISTANT)
For more detailed information on the use of DWZZA–AA SCSI signal converters,
see the StorageWorks Family User’s Guide.
1–2 TZ8x7-Series Tape Drive SCSI Buses
Section 2.2 presents further information on the planning and installation of
TZ8x7-series tape drive buses in StorageWorks storage-only cabinets.
1.1.2 Controller/Storage Cabinet Configurations
In a controller/storage cabinet configuration, the controller for devices in the
cabinet is located within the cabinet. The SCSI bus arrangement for TZ8x7-series
tape drives in StorageWorks controller/storage cabinets is shown in Figure 1–2.
Figure 1–2 Controller/Storage Cabinet SCSI Bus Arrangement
REAR PANEL
SCSI
CONNECTORS
H8574A
TERMINATOR
StorageWorks CABINET
TZ8x7-SERIES
TAPE DRIVE
BC19J-1E
JUMPER CABLE
(.5 METER LENGTH)
CONTROLLER
DEVICE PORT
CONNECTORS
TZ8x7 -SERIES
TAPE DRIVE
17-03831
ADAPTER CABLE
(.2 METER LENGTH)
CONTROLLER CABLE
(BN21H-xx SCSI A
CABLE-LENGTH TO
SUIT APPLICATION)
HS-FAMILY
CONTROLLER
CXO-4050A-MC
One or two TZ8x7-series tape drives may be installed in a controller/storage
cabinet. The tape drives may be configured on one or two SCSI buses. The
units are serially connected using an adapter cable and one jumper cable, and a
controller cable connects the tape drive bus to the controller within the cabinet.
A terminator is installed on the last tape drive on the bus.
Section 2.3 presents further information on the planning and installation of
TZ8x7-series tape drive SCSI buses in StorageWorks controller/storage cabinets.
TZ8x7-Series Tape Drive SCSI Buses 1–3
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