Compaq S5 User manual

DWZZH 16–Bit UltraSCSI
Hub (Rack-Mountable)
User’s Guide
EK–SMDZS-UG. B01
Compaq Computer Corporation
Houston, Texas

Second edition, November 1998
This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to Part 15 of the FCC rules. Operation is subject to the
following two conditions: (1) This device may not cause harmful interference and (2)
This device must accept any interference that may cause undesirable operation.
This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause harmful interference
to radio communications. However, there is no guarantee that interference will not
occur in a particular installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one or more of the
following measures:
− Reorient or relocate the receiving antenna.
− Increase the separation between the equipment and receiver.
− Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
− Consult the dealer or an experienced radio/TV technician for help.
Japanese VCCI Statement
Compaq Computer Corporation makes no representations that the use of its products in
the manner described in this publication will not infringe on existing or future patent
rights, nor do the descriptions contained in this publication imply the granting of
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Possession, use, or copying of the software described in this publication is authorized
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The following are trademarks of Compaq Computer Corporation: Compaq, DEClaser,
DIGITAL, OpenVMS, PATHWORKS, VAX DOCUMENT, and the Compaq logo.
© Compaq Computer Corporation 1998. All Rights Reserved
Printed in the United States of America

EK-SMDZS-UG. B01 iii
Contents
Revision Record…………………………………………………………………v
About This Guide………………………………………………………….…..vii
1 Introducing the 16-Bit UltraSCSI Hub (Rack-Mountable)
1.1 UltraSCSI Hub Features..........................................................................................1–1
1.2 Product Descriptions...............................................................................................1–2
1.2.1 DWZZH-S5......................................................................................................1–2
1.2.2 DWZZH-09 ......................................................................................................1–3
1.3 Product Specifications............................................................................................1–4
2 Setting Up the DWZZH-09
2.1 Set Up DWZZH-09..................................................................................................2-1
2.1.1 Install 0.5m Cable in DWZZH-09......................................................................2-1
2.2 Configuration Note.................................................................................................2–4
3 Using the 16-Bit UltraSCSI Hub
3.1 Large Hub Fair Arbitration.....................................................................................3–1
3.2 Large Hub Addressing Configurations....................................................................3–2
3.2.1 Narrow Addressing Setting...............................................................................3–2
3.3 Front Panel.............................................................................................................3–4
3.3.1 Fair ARB Disable .............................................................................................3–6
3.3.2 Indicators..........................................................................................................3–6
3.4 Determining the Configuration ...............................................................................3–8
3.5 Selecting the SCSI Cables.......................................................................................3–8
4 Installing the DWZZH-09 Upgrade Kit
4.1 Install Upgrade.......................................................................................................4–2
4.1.1 Install 0.5m Cable.............................................................................................4–2
5 SWCC and UltraSCSI Hubs
5.1 Agents and Storage.................................................................................................5–1
Appendix A Removable Parts of the DWZZH–S5 and DWZZH–09......A–1
Glossary.......................................................................................................G–1

DWZZH 16-Bit UltraSCSI Hub (Rack-Mountable)
iv EK-SMDZS-UG. B01
Figures
1–1 DWZZH–S5 ...........................................................................................................1–2
1–2 DWZZH–09............................................................................................................1–3
2–1 Attach Tri–Link to Cable........................................................................................2–1
2–2 Install Tri–Link and Cable in Storage Ports of SBBs...............................................2–2
2–3 A Sample Configuration.........................................................................................2–3
2–4 Maximum Allowable Cable Distances ....................................................................2–4
3–1 DWZZH–S5 SCSI ID Assignments.........................................................................3–3
3–2 DWZZH-09 SCSI ID Assignments .........................................................................3–4
3–3 DWZZH–S5 Front Panel.........................................................................................3–5
3–4 DWZZH-09 Front Panel .........................................................................................3–6
3–5 DWZZH–S5 SCSI Narrow ID Assignments............................................................3–7
3–6 DWZZH–S5 SCSI Narrow Addressing Jumper.......................................................3–8
4–1 DWZZH–09 Upgrade Kit Contents.........................................................................4–1
4–2 Install DWZZH–A5 SBB in Shelf...........................................................................4–2
4–3 Attach Tri–Link to Cable.........................................................................................4-3
4-4 Install Tri–Link and Cable in Storage Ports of SBBs................................................4-3
5-1 Running One SWCC Agent for a Particular Storage Subsystem...............................5-2
A–1 Removable Parts of the DWZZH–S5 ..................................................................... A–2
A–2 Removable Parts of the DWZZH–09......................................................................A–2
Tables
1–1 UltraSCSI Hub Functional Specifications ...............................................................1–4
A–1 Removable Parts of the DWZZH–S5 ..................................................................... A–1
A–2 Removable Parts of the DWZZH–09......................................................................A–1

EK–SMDZS–UG. B01 v
Revision Record
The Revision Record provides a concise publication history of this guide. It lists the guide
revision levels and release dates, and summarizes the changes.
The following revision history lists all revisions of this publication and their effective
dates. The publication part number is included in the Revision Level column, with the
last entry denoting the latest revision. This publication supports the DWZZH 16-Bit
UltraSCSI Bus Hub.
Revision Level Date Summary of Changes
EK–SMDZS–UG. A01 July 1998 Original Release.
EK–SMDZS–UG.B01 October 1998 Change 1st sentence in section
3.3.3; move section 3.3.3 from
pg.3-6 to pg. 3-2.

EK–SMDZS–UG. B01 vii
About This Guide
This chapter tells you what this User’s Guide does, identifies the audience, describes the
structure and contents (chapter-by-chapter) briefly, and tells you how to get support and
services from COMPAQ.
This User’s Guide describes the purpose, function, operation, and use of the DWZZH
16-Bit UltraSCSI Rack-Mountable Hub (the DWZZH Hub or the Hub). The DWZZH
Hub allows the connection of up to five ports on one logical SCSI bus on the
DWZZH-S5 model and up to nine on the DWZZH-09 unit.
Audience
This guide is intended for end users and for COMPAQ employees responsible for
configuring, installing, and maintaining the StorageWorks subsystem and its
components.
Related Documentation
You should be familiar with the information contained in the following
documentation:
Document Title Order Number
StorageWorks Solutions Configuration Guide EK–BA350–CG
StorageWorks Solutions Shelf and SBB User’s Guide EK–BA350–UG
StorageWorks SBB Shelf I/O Modules EK–SBBIO–UG
StorageWorks UltraSCSI Configuration Guidelines EK–ULTRA–CG
StorageWorks Solutions BA356–SB 16-bit Shelf User’s Guide EK–BA356–UG

DWZZH 16–Bit UltraSCSI Hub (Rack-Mountable)
viii EK–SMDZS–UG. B01
Shared Storage Solutions Using UltraSCSI Hubs EK-SMA21-AN
Shared Storage for Windows NT Using UltraSCSI Hubs EK-SMA17-AN
Shared Storage for OpenVMS Using UltraSCSI Hubs EK-SMA19-AN
Shared Storage for DIGITAL UNIX Using UltraSCSI Hubs EK-SMA20-AN
Shared Storage for Sun Solaris Using UltraSCSI Hubs EK-SMA18-AN
Document Structure
This guide contains the following chapters:
Chapter 1. Introducing the 16-Bit UltraSCSI Hub (Rack-Mountable)
This chapter gives brief functional and physical descriptions of the DWZZH Hub
and lists significant product specifications.
Chapter 2. Setting Up the DWZZH-09
This chapter gives instructions for installing the 0.5m cable on the DWZZH-09
Hub.
Chapter 3. Using the 16-Bit UltraSCSI Hub
This chapter gives procedures for configuring a StorageWorks SCSI bus using a
DWZZH Hub.
Chapter 4. Installing the DWZZH-09 Upgrade Kit
This chapter gives instructions for installing the DWZZH-09 Upgrade Kit in a
DWZZH-S5.
Chapter 5. SWCC and UltraSCSI Hubs
This chapter is intended to provide you with some important information
regarding the use of StorageWorks Command Console (SWCC) on SCSI buses
that have an UltraSCSI Hub. While the information provided here is important,
it is essential that you have read the SWCC manual and release notes.
Appendix A. Removable Parts of the DWZZH-S5 and DWZZH-09
This Appendix identifies the parts that can be removed and replaced from the
DWZZH-S5/-09 16-Bit UltraSCSI Rack-Mountable Hubs.
Glossary
The Glossary defines terms that are used frequently with StorageWorks and SCSI
bus components.

About This Guide
EK–SMDZS–UG. B01 ix
Getting Help
If you have a problem and have exhausted the
information in this guide, you can get further
information and other help in the following locations.
Compaq Web Site
The Compaq Web Site has information on this product
as well as the latest drivers and Flash ROM images.
You can access the Compaq Web Site by logging on to
the Internet at http://www.compaq.com.
Telephone Numbers
For the name of your nearest Compaq Authorized
Reseller:
In the United States, call 1-800-345-1518
In Canada, call 1-800-263-5868
For Compaq technical support:
In the United States and Canada, call 1-800-386-2172

EK-SMDZS-UG. B01 1-1
1
Introducing the 16-Bit UltraSCSI Hub
(Rack-Mountable)
This chapter gives a brief physical description and describes the functions and functional
specifications of the DWZZH-S5 and DWZZH-09 UltraSCSI Hubs.
The series of DWZZH Hubs are SCSI–2 and draft SCSI–3 (ANSI X379.2/91–
10R3) compliant capable with data transfer rates of up to 40 Mbytes per second.
The two versions of these Hubs are:
• DWZZH-S5: A shelf-contained, rack-mountable, 5.25" SBB (large) Hub
with four host ports and one storage port, all differential. See Figure 1–1.
• DWZZH-09: A shelf-contained, rack-mountable Hub consisting of two
5.25" SBBs (large) with eight host ports and one storage port, all
differential. See Figure 1–2.
1.1 UltraSCSI Hub Features
Most device SCSI buses are either 8-bit or 16-bit single-ended, physical buses.
Some controllers and hosts use differential buses and others use a single-ended
bus. Single-ended and differential physical buses are not compatible. The
UltraSCSI protocol disables both buses when they are connected together. By
using an UltraSCSI Hub you can accomplish the following:
• Provide radial disconnect where remaining connections can continue to
operate.
• Provide fair SCSI arbitration for host nodes (DWZZH-05, -S5 and the -09
UltraSCSI Hubs only).

DWZZH 16-Bit UltraSCSI HUB (Rack-Mountable)
1–2 EK–SMDZS–UG. B01
1.2 Product Descriptions
1.2.1 DWZZH-S5
A DWZZH-S5 large UltraSCSI Hub (See Figure 1-1) consists of two 180W
power supplies, three bulkhead covers, a personality card cover, and a
DWZZH-05 SBB mounted within a shelf. This model is rack-mountable, in
either a horizontal or vertical position. Termination is provided by each of the
host ports. A feature of the DWZZH-S5 Hub is that it is upgradeable from a five
port Hub to a nine port Hub with the purchase of a DWZZH-09 Upgrade Kit. The
kit contains another 5.25" SBB (large) Hub (DWZZH-A5), a tri-link and 0.5m
cable, and instructions to complete the installation, and configuration for the
upgrade.
CAUTION
Connecting a single-ended bus cable to the
differential connector causes the SCSI bus to fail.
Figure 1–1 DWZZH–S5

Chapter 1. Introducing the 16-Bit UltraSCSI Hub (Rack-Mountable)
EK–SMDZS–UG. B01 1–3
1.2.2 DWZZH-09
The DWZZH-09 is made up of two large Hubs connected by a 0.5m VHDCI
cable (BN 37A-0E). A tri-link attached to the DWZZH-A5 portion of the Hub
allows the attachment of a storage device up to 25 meters away from the Hub.
The Hub provides radial connectivity by allowing the user to connect up to eight
host bus adapters from any number of distributed systems to the DWZZH-09.
Termination is provided by each of the host ports. (See Figure 1-2.)
Figure 1-2 DWZZH-09
SHR-1105

DWZZH 16-Bit UltraSCSI HUB (Rack-Mountable)
1–4 EK–SMDZS–UG. B01
1.3 Product Specifications
Table 1-1 lists the functional specifications for the DWZZH Hub.
Table 1–1 UltraSCSI Hub Functional Specifications
Feature Specification
SCSI ID
SCSI Addresses The small UltraSCSI Hub does not use a SCSI ID. The large UltraSCSI Hub uses SCSI ID 7 for arbitration,
when the fair arbitration option is enabled.
Overload Protection
DTERMPOWER
STERMPOWER
TERMPOWER is not supplied by the UltraSCSI Hub.
Internal TERMPOWER is protected via a resetable fuse.
TERMPOWER must be supplied from the remote
connection to enable
each Hub port.
Shielding, Enclosure &
Connectors Shielded for ESD, EMI, and safety requirements.
Power-Up Reset Automatically clears:
• Initiator detection circuit
• Target detection circuit
• BSY glitch filter
SCSI Bus Reset Automatically clears:
• Initiator detection circuit
• Target detection circuit
• BSY glitch filter
Differential SCSI Bus
Length
Ultra (20 megatransfers
per second or 40 MB/s)
25 meters (82 feet) per segment. Refer to
Chapter 2,
Section 2.2 Configuration Note
for more information
regarding cabling distances.
Data Timing The relationship between the data and the control
signals is brought to SCSI compatibility before
transmission to the other SCSI bus.
Design High reliability SMT

Chapter 1. Introducing the 16-Bit UltraSCSI Hub (Rack-Mountable)
EK–SMDZS–UG. B01 1–5
Table 1–1 DWZZH HUB Functional Specifications (Cont’d)
Feature Specification
Cable Fault DIFFSENSE support and port disable on cable fault.
Glitch Elimination 100% glitch-free operation during power-up
BUSY GLITCH trap eliminates cable length constraint
due to wired-OR glitches on the BSY line.
Termination
Differential Termination for 16-bit operation.
Service
There are no user serviceable functions on these products.
Contact Digital service personnel all service.
Agency Approvals
UL, CSA, FCC Class B, TUV
Environmental Specifications
Relative Humidity 10% to 85% non-condensing
Operating Temperature 10°C to 40°C (50°F to 104°F)
Storage Temperature (non-
operating) –40°C to 66°C (–40°F to 151°F)
Power Requirements
DWZZH +5V
TERMPOWER Supplied to internal terminators only.
SCSI Connectors and Cables
Differential Board-mounted, 68-pin VHDCI SCSI connector
Cables Refer to EK-ULTRA-CK.C01 UltraSCSI Configuration
Guidelines
.

EK–SMDZS–UG. B01 2–1
2
Setting Up the DWZZH-09
This chapter gives instructions for setting up and configuring the DWZZH-09 Hub.
2.1 Set Up DWZZH-09
1. After removing the unit from the box, shipping material, and plastic bag, set
it in a secure place or mount in a rack.
2. Remove the following parts from the shipping bag:
• 0.5m Cable, P/N BN37A-0E
• Tri-link
NOTE
If you do not have all of the above listed parts,
contact your sales representative.
2.1.1 Install 0.5m Cable in DWZZH-09
1. Attach the 0.5m cable to the top port of the tri-link, refer to Figure 2-1.
Figure 2-1 Attach Tri-link to Cable
SHR-1109

DWZZH 16–Bit UltraSCSI Hub (Rack-Mountable)
2–2 EK–SMDZS–UG. B01
2. Install and secure tri-link in storage port of right-hand SBB (-A5). Then
install and secure the opposite end of the cable in the storage port of the left
hand SBB (-05), Figure 2-2.
Figure 2-2 Install Tri-link and Cable in Storage Ports of SBBs
SHR-1110
3. Install power cords in power supplies on unit.
4. Attach the cables from your host bus adapters to their respective ports on the
DS-DWZZH-09. Refer to Chapter 3, Figure 3-2 for the SCSI ID port
assignments on the DS-DWZZH-09.
5. Connect your storage subsystem via cable to the remaining port on the
tri-link attached to the right-hand SBB of the DS-DWZZH-09.

Chapter 2. Setting Up the DWZZH-09
EK–SMDZS–UG. B01 2–3
Figure 2–3 A Sample Configuration

DWZZH 16–Bit UltraSCSI Hub (Rack-Mountable)
2–4 EK–SMDZS–UG. B01
2.2 Configuration Note
According to the UltraSCSI Configuration Guidelines (included in your
purchase), the maximum allowable cable distance for an UltraSCSI Domain is 74
meters. Each element, including the DWZZH-09 has an associated relative cable
distance value associated. Cables count as their specified distance, (including the
0.5 meter jumper cable between the SBB Hubs); but each DWZZH SBB counts
as an 18.5 meter cable equivalent. This means that communications from a
server attached to the left-hand SBB to a server attached to the right-hand SBB,
already has a 37.5 meter cable equivalent distance cost to propagate the signal
through the DWZZH-09 Hub. Therefore, if the distance from server A to the Hub
is X, and the distance from server B to the Hub is Y, then the sum cable distance
of Xand Ymust be less than or equal to 36.5 meters (74 – 37.5). Please note that
any SCSI transaction from a host to the storage subsystem only propagates
through one of the SBBs. This means that you may still have a cable length of 25
meters between the storage subsystem and the DS-DWZZH-09. Refer to Figure
2–4.
Figure 2–4 Maximum Allowable Cable Distances