Compaq AlphaServer DS20 Manuale utente

Compaq Computer Corporation

Maynard, Massachusetts

AlphaServer DS20 Ultra SCSI

Internal StorageWorks Shelf

Configuration Guide

Order Number: EK-H8253-IN. A01

First Printing, November 1998

The information in this publication is subject to change without notice.

COMPAQ COMPUTER CORPORATION SHALL NOT BE LIABLE FOR

TECHNICAL OR EDITORIAL ERRORS OR OMISSIONS CONTAINED

HEREIN, NOR FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES

RESULTING FROM THE FURNISHING, PERFORMANCE, OR USE OF

THIS MATERIAL. THIS INFORMATION IS PROVIDED “AS IS” AND

COMPAQ COMPUTER CORPORATION DISCLAIMS ANY WARRANTIES,

EXPRESS, IMPLIED OR STATUTORY AND EXPRESSLY DISCLAIMS THE

IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR

PARTICULAR PURPOSE, GOOD TITLE AND AGAINST INFRINGEMENT.

This publication contains information protected by copyright. No part of this

publication may be photocopied or reproduced in any form without prior

written consent from Compaq Computer Corporation.

The software described in this guide is furnished under a license agreement

or nondisclosure agreement. The software may be used or copied only in

accordance with the terms of the agreement.

Compaq, Compaq Insight Manager, registered United States Patent and

Trademark Office.

Microsoft and Windows NT are registered trademarks of Microsoft

Corporation.

Other product names mentioned herein may be trademarks and/or

registered trademarks of their respective companies.

AlphaServer DS20 Ultra SCSI Configuration Guide 1

Introduction

This document shows how to install and configure a second Ultra

SCSI bus repeater card on a Compaq AlphaServer DS20 system. The

following topics are covered:

•Kit Contents

•Configuration Diagrams

•Configuring the Ultra SCSI Bus

•Verifying the Configuration

2 AlphaServer DS20 Ultra SCSI Configuration Guide

Kit Contents

The Ultra SCSI Bus Splitter Kit (H8253-AA) contains the following

items for converting the single bus on the Compaq AlphaServer DS20

to a split bus:

Item Description Part Number

➊SCSI bus repeater card 30-48985-01

➋SCSI data cable (from SCSI controller to

repeater) 17-04890-01

➌SCSI data cable (from backplane to

repeater) 17-04022-03

➍Y power cable harness assembly 17-04700-01

➎SCSI active terminator assembly 17-04795-01

➏Cable ties (2) 90-09617-00

➐Documentation EK-H8253-IN

Figure 1 Kit Contents

PK0915

AlphaServer DS20 Ultra SCSI Configuration Guide 3

Single-Bus Configurations

The Compaq AlphaServer DS20 internal StorageWorks shelf is

configured for single-bus mode. Your system came with one of the

following StorageWorks configurations:

•A single-bus configuration with one multi-channel controller

(Figure 2).

•A single-bus configuration with two single-channel controllers

(Figure 3).

Figure 2 Single-Bus Configuration (One Multi-Channel Controller)

J10

J12

J11

J16

J13

J17

(Rear)

Repeater

SE-A

SE-B

Motherboard

StorageWorks Shelf

Bus B

PCI0 SLOT 7

PCI0 SLOT 8

PCI0 SLOT 9

PCI1 SLOT 8

PCI1 SLOT 9

ISA SLOT

PCI1 SLOT 7

Power

Supply

Bus A

PK0912

(Front)

4 AlphaServer DS20 Ultra SCSI Configuration Guide

Figure 3 Single-Bus Configuration (Two Single-Channel Controllers)

Power

Supply Motherboard

Bus B

StorageWorks Shelf

(Front)

Repeater

PCI0 SLOT 7

PCI0 SLOT 8

PCI0 SLOT 9

PCI1 SLOT 9

ISA SLOT

PCI1 SLOT 7

J10

J12

J11

J16

J13

J17

(Rear)

SE-A

SE-B

PCI1 SLOT 8

Bus A

PK0913

AlphaServer DS20 Ultra SCSI Configuration Guide 5

Split Bus Configuration

The H8253-AA kit allows you to convert the single bus to a split bus

(Figure 4). For this configuration, you must add a repeater card as

described in the following sections. Three SCSI controller channels

are required.

Figure 4 Split-Bus Configuration

Power

Supply Motherboard

StorageWorks Shelf

Repeaters

SE-A

SE-B

PCI0 SLOT 7

PCI0 SLOT 8

PCI0 SLOT 9

PCI1 SLOT 9

ISA SLOT

PCI1 SLOT 7

J10

J12

J11

J16

J13

J17

(Rear)

SE-A

SE-B

PCI1 SLOT 8

Bus A

PK0914

Bus B

Bus C

(Front)

Bus B

Bus C

6 AlphaServer DS20 Ultra SCSI Configuration Guide

Converting to a Split Bus

Removing the System Covers

1. Shut down the operating system and power down the system

hardware.

2. Unplug the power cords.

3. Remove the covers of the enclosure to gain access to the

StorageWorks backplane. See Figure 5.

a. Unlock the front door and open the drive access area.

b. Pull the top cover latch down to unlock the cover.

c. Using the groove at the rear of the top cover, pull the cover

straight back about two inches, and lift up the cover.

d. Slide the left panel back, and then pull it up and away from

the unit. Repeat this step for the right panel.

Figure 5 Removing Covers

Top Cover

Release Latch

IP00205-97

AlphaServer DS20 Ultra SCSI Configuration Guide 7

Installing the Repeater Card

1. Snap the SCSI bus repeater card (30-48985-01) upright into the

standoffs on the side of the StorageWorks shelf. See 1.

2. Remove the connecting jumper cable from the StorageWorks

backplane. See 2.

3. Disconnect the power cable from the connector. See 3.

Figure 6 Installing the Repeater Card

PK0230

8 AlphaServer DS20 Ultra SCSI Configuration Guide

Connecting the Cabling

NOTE: Refer to Figure 7 to complete the following instructions.

1. Connect the center female connector of the Y power cable harness

assembly (17-04700-01). See 5.

2. Plug the other female connector of the Y-cable into the power

connector on the repeater card. See 6.

3. Plug the male end of the Y-cable into the power cable you

disconnected previously (page 7, step 3). See 7.

4. Connect one end of the short SCSI data cable (17-04022-03) to the

right SCSI connector on the repeater card. Connect the other end

to the connector on the StorageWorks backplane. See 8.

5. Connect one end of the long SCSI data cable (17-04890-01) to the

left SCSI connector on the repeater card. Dress the cable as on

the original card and connect the other end to a SCSI controller.

See 9.

6. Connect the terminator assembly. See 10.

7. Remove the W1 jumper and save it for future use, if desired. See

11.

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