Compaq StorageWorks 4200 Series User manual

Second Edition (December 1999)

Part Number: EK–SW2ZS–UA. B01 / 148451-002

Compaq Computer Corporation

Enclosure 4200 Family

LVD Disk Enclosure

User Guide

Part Number: EK–SW2ZS–UA. B01 / 148451-002

Notice

While Compaq Computer Corporation believes the information included in this manual is correct as

of the date of publication, it is subject to change without notice. Compaq makes no representations

that the interconnection of its products in the manner described in this document will not infringe on

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. No

responsibility is assumed for the use or reliability of the firmware on equipment not supplied by

Compaq or its affiliated companies. Possession, use, or copying of the software described in this

documentation is authorized only pursuant to a valid written license from Compaq, an authorized

sublicensor, or the identified licensor.

Compaq, StorageWorks wordmark, DIGITAL, and StorageWorks

Registered in United States Patent and Trademarks Office and other jurisdictions.

All other trademarks and registered trademarks are the property of their respective owners.

Compaq StorageWorks Enclosure 4200 Family LVD Disk Enclosure User Guide

Second Edition (December 1999)

Part Number: EK–SW2ZS–UA. B01 / 148451-002

Contents

About This Guide

Intended Audience. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix

How this Guide is Arranged . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix

Documentation Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi

Related Documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiv

Chapter 1

Introducing the Enclosure

Disk Enclosure Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2

SCSI Buses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3

High Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3

Variable Speed Blowers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3

Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4

Data Integrity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4

Status Monitoring and Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4

Enclosure Layout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4

Major Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–7

Element Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–7

Element Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–7

Chapter 2

Starting the Enclosure

Connecting the SCSI Bus Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1

Applying Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–6

Verifying Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–7

Chapter 3

I/O Modules

Common Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2

Configuring the Enclosure SCSI Bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2

iv Compaq Enclosure 4200 Family LVD Disk Enclosure User Guide

Module Power Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–3

SCSI Bus Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–3

Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–4

Terminator LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–4

Power LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–4

SCSI Bus Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–4

Replacing an I/O Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–5

Single-Bus Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–5

Single-Bus I/O Module Status Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–6

Single-Bus SCSI Address Maps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–6

Dual-Bus I/O Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–7

Dual-Bus I/O Module Status Displays. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–8

Dual-Bus SCSI Address Maps. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–9

Chapter 4

Environmental Monitoring Unit

Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–2

Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–3

Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–4

Fault Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–4

Enclosure Status Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–4

Device Swap Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–5

Device Fault Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–5

Replacing an EMU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–5

Chapter 5

Disk Drives

Status Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–2

Drive Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–3

Drive Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–4

Drive Blank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–5

Replacing a Disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–6

Chapter 6

Enclosure Power and Cooling

Enclosure Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–2

Power Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–2

Temperature Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–3

Blower Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–3

Blowers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–3

Status Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–4

Contents v

Replacing a Power Supply or Blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–4

Chapter 7

Replacing CRUs

Ordering a CRU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–1

ESD Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–1

Basic Replacement Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–2

Initial Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–3

Replacing a Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–4

Replacing the Variable Speed Blower. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–6

Replacing the EMU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–8

Replacing a Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–9

Replacing the I/O Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–12

Appendix A

Regulatory Notices

FCC Class B Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–1

Country-Specific Certifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–2

Appendix B

Specifications

Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–1

Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–3

Power Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–4

Glossary

Index

vi Compaq Enclosure 4200 Family LVD Disk Enclosure User Guide

Figures

Figure 1–1. 14-drive enclosure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1

Figure 1–2. Disk enclosure (rear view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2

Figure 1–3. 14-drive enclosure bays. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–5

Figure 1–4. Enclosure status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–6

Figure 1–5. Rear -mounted elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–6

Figure 2–1. Single-bus I/O module cable connector . . . . . . . . . . . . . . . . . . . . . . . 2–2

Figure 2–2. Dual-bus I/O module cable connectors. . . . . . . . . . . . . . . . . . . . . . . . 2–3

Figure 2–3. Typical front status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–7

Figure 2–4. Rear status LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–8

Figure 3–1. Single-bus I/O module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1

Figure 3–2. Dual-bus I/O module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–1

Figure 3–3. SCSI Bus A connector symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–4

Figure 3–4. SCSI Bus B connector symbol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–4

Figure 3–5. Single-bus I/O module components . . . . . . . . . . . . . . . . . . . . . . . . . . 3–5

Figure 3–6. Dual-bus I/O module components. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–7

Figure 4–1. Model 4200-series LVD disk enclosure EMU . . . . . . . . . . . . . . . . . . 4–1

Figure 4–2. Model 4200-series LVD disk enclosure EMU location . . . . . . . . . . . 4–2

Figure 4–3. Drive and Enclosure status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–3

Figure 5–1. 1-Inch disk drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–1

Figure 5–2. Disk drive LEDs display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–2

Figure 5–3. 1-Inch drive blank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–5

Figure 6–1. Power supply and blower assembly components . . . . . . . . . . . . . . . . 6–1

Figure 7–1. Typical CRU product label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–1

Figure A–1. Typical enclosure certification label . . . . . . . . . . . . . . . . . . . . . . . . A–2

Tables vii

Tables

Table 1–1 CRU Replacement Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–8

Table 2–1 Enclosure–Host Controller Maximum Cable Lengths . . . . . . . . . . . . . . . . . 2–3

Table 2–2 Drive Enclosure—Host Controller SCSI Cables . . . . . . . . . . . . . . . . . . . . . 2–4

Table 2–3 Installing SCSI Bus Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–6

Table 3–1 Single-Bus Status LED Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–6

Table 3–2 Single Bus SCSI Bus IDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–6

Table 3–3 Dual-Bus Status LED Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–8

Table 3–4 Dual Bus SCSI Bus IDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–9

Table 5–1 Drive LED Status Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–3

Table 6–1 Power Supply and Blower Status Displays . . . . . . . . . . . . . . . . . . . . . . . . . 6–4

Table 7–1 Common Replacement Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–2

Table 7–2 Installing a Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–4

Table 7–3 Blower Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–6

Table 7–4 EMU Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–8

Table 7–5 Power Supply Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–9

Table 7–6 I/O Module Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–12

Table B–1 Disk Enclosure Physical Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . B–2

Table B–2 Element Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–2

Table B–3 Operating Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–3

Table B–4 Shipping or Short Term Storage Specifications. . . . . . . . . . . . . . . . . . . . . B–4

Table B–5 AC and DC Power Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–4

About This Guide

Intended Audience

This publication is designed for use by Compaq StorageWorks users who are responsible for installing

and maintaining the rack mounted (models 4214R and 4254R) and the tower mounted (models 4214T,

and 4254T) Ultra2 SCSI low voltage differential (LVD) disk enclosures.

How this Guide is Arranged

This manual discusses the product features and operations from the general to the specific. The major

sections of this publication include:

Chapter 1, “Introducing the Enclosure”

This chapter is a description of the LVD disk enclosure features and elements.

Chapter 2, “Starting the Enclosure”

This chapter discusses operating an LVD disk enclosure.

Chapter 3, “I/O Modules”

This chapter discusses the I/O modules functions, operation, and status displays.

x Compaq Enclosure 4200 Family LVD Disk Enclosure User Guide

Chapter 4, “Environmental Monitoring Unit”

This chapter describes the EMU and the high availability fault bus.

Chapter 5, “Disk Drives”

This chapter describes the disk drives, operation, and status reporting.

Chapter 6, “Enclosure Power and Cooling”

The chapter describes the power supply and blower operation and status reporting.

Chapter 7, “Replacing CRUs”

This chapter describes the procedures for replacing customer replaceable units (CRUs).

Appendix A, “Regulatory Notices”

This appendix defines the country-specific regulatory standards for this product.

Appendix B, “Specifications”

This appendix describes the physical, environmental, and electrical specifications of the LVD disk

enclosure and elements.

Glossary

The glossary defines terms common to this product.

Index

An alphabetical reference to major subjects.

About This Guide xi

Documentation Conventions

Table 1 is a list of the documentation conventions and symbols used in this publication.

Table 1 Text Symbols

Text Entries

Boldface type—Boldface type indicates the first instance of terms being defined in the text, the

glossary, or both.

italic type—Italic type indicates one of the following.

■ Emphasis

■ A publication title

■ A glossary cross-reference to another glossary entry.

Special Information

WARNING: Warning contains information essential to people’s safety. It advises

users to take or avoid a specific action could result in physical harm to the user.

CAUTION: A Caution contains information that the user needs to know to avoid

damaging the software or hardware.

IMPORTANT: An important note provides information essential to the completion of a task.

Users can disregard information in a note and still complete a task, but they should not

disregard an important note.

NOTE: A note includes information than emphasizes or supplements important points of the

main text. A note supplies information that may apply only in special cases—for example,

memory limitations, equipment configurations, or details that apply to specific versions of a

program.

xii Compaq Enclosure 4200 Family LVD Disk Enclosure User Guide

Table 2 is a list of the symbols that appear on devices and in this publication.

Status LED Symbols

LED is OFF.

LED is O

N.

LED is F

LASHING

Table 2 Device Symbols

Enclosure Symbols

Enclosure LED label

(Symbol definitions follow.)

Enclosure Status (green)

Enclosure Power (green)

Enclosure Fault (amber)

NOTE: This signal indicates there is an enclosure fault. This does not

indicate that there is possibility of personal injury and is therefore NOT a

WARNING.

Table 1 Text Symbols (Continued)

About This Guide xiii

EMU Symbols

EMU Status LED symbol (green)

I/O Module Symbols

Power Status (ON) LED (green)

Terminator Status LED (green)

SCSI Bus A Connector

Ultra2 SCSI Bus

Input Connector

ISCSI Bus B Connector

Ultra2 SCSI Bus

Input Connector

Drive LED Symbols

Drive Activity LED

Drive Online LED

Drive FAILURE LED

Table 2 Device Symbols (Continued)

xiv Compaq Enclosure 4200 Family LVD Disk Enclosure User Guide

Related Documents

Table 3 lists publications that contain additional information relevant to the LVD disk enclosure

products.

Table 3 Related Publications

Publication Title Part Number

Compaq StorageWorks

Disk Enclosure RETMA Rack Mounting Kit Installation Card

127430-001

Compaq StorageWorks

Disk Enclosure RETMA Rack Mounting Template

102943-001

Hot-Pluggable Wide-Ultra2 SCSI Hard Drives Installation Card

386195-001

Compaq StorageWorks

Replacing a Disk Enclosure Environmental Monitoring Unit Installation Guide

148455-001

Compaq StorageWorks

Replacing a Disk Enclosure Power Supply Installation Guide

148454-001

Compaq StorageWorks

Replacing a Disk Enclosure Ultra2 SCSI I/O Module Installation Guide

148453-001

Compaq StorageWorks

Replacing a Disk Enclosure Variable Speed Fan Installation Guide

148452-001

Compaq StorageWorks

Tower Model 4200T-Series User Guide

122942-001

Chapter 1

Introducing the Enclosure

This chapter describes the StorageWorks Enclosure 4200 family of low voltage

differential (LVD) disk enclosures (see Figure 1–1 and Figure 1–2). These enclosures

support Wide-Ultra and Wide-Ultra2 small computer system interface (SCSI)

protocols. The internal bus supports only LVD drives. The external bus (the enclosure to

the host controller bus) supports either Wide-Ultra2 (LVD) and or Wide-Ultra

single-ended (SE) SCSI protocols. The information in this publication is based on using

the Wide Ultra2 LVD SCSI protocol, the most efficient means of transferring data.

Figure 1–1. 14-drive enclosure

CXO6854A

1–2 Compaq StorageWorks Enclosure 4200 Family LVD Disk Enclosure User Guide

Figure 1–2. Disk enclosure (rear view)

Disk Enclosure Features

The Model 4214- and Model 4254-series enclosures support fourteen, 1-inch, 3.5-inch

form factor hard disk drives or drive blanks. These enclosures are available in either a

rack mountable version (4214R) or in a tower version (4214T). A rack (cabinet) mounted

enclosure requires a RETMA 3U vertical opening (5.25-inches) where a “U” is 1.75

inches.

CAUTION: To ensure proper cooling, all drive bays must have either a drive or drive

blank installed.

The enclosure provides several features, including:

■ Hot-pluggable drives, environmental monitoring unit (EMU), blowers, and power

supplies are replaceable without stopping SCSI bus data transfers.

NOTE: An element with a port colored latch, tab, or handle is hot pluggable.

■

Pluggable I/O module and SCSI bus cables require stopping all data transfers, but do

not require removing power before replacing.

■ Depending upon the host controller, the I/O module is capable of supporting

Wide-Ultra2 SCSI (LVD) or Wide-Ultra SCSI (SE) bus operations.

CXO7082A

Introducing the Enclosure 1–3

These enclosures do not support the following storage devices:

■ Tape drives

■ CD-ROMs

■ Solid state drives

The enclosure has guides that ensure the drives, EMU, I/O module, and power supplies

(the enclosure elements) align and properly mate with the backplane connectors. A

blower guide post on the blower ensures that the blower properly mates with the power

supply. The elements and the metal enclosure provide electromagnetic interference

(EMI) suppression and control air flow within the enclosure.

SCSI Buses

The enclosure supports only Wide-Ultra2 SCSI, wide (16-bit), internal LVD buses.

Depending on the host interface, the external SCSI bus, the bus from the I/O module to the

host can be either Wide-Ultra or Wide-Ultra2, LVD or SE. The SCSI bus type determines

the length of this bus, and therefore, the maximum cable length. The standard Compaq

cable length of 12 ft (3.7 m) ensures satisfactory operation. As for all SCSI buses, the

shorter the cable, the more efficient the bus operation.

NOTE: The maximum bus length is the inverse of the transmission speed. The faster the

transmission rate, the shorter the bus length. For more information about the supported SCSI

bus lengths, see Chapter 3.

Each enclosure has two internal SCSI buses, with half of the devices on each bus. The

single-bus I/O module places all the devices on a single-bus of either 10 or 14 devices. The

dual-bus I/O module maintains two internal buses with either 5 or 7 devices on each bus.

High Availability

The high availability features of the enclosure are a function of the blowers and the power

supplies.

Variable Speed Blowers

All enclosures have two variable speed blowers. In all configurations, the failure of one

blower automatically causes the other blower to operate at a high speed. This ensures that

the failure of a single blower does not disable the enclosure.

1–4 Compaq StorageWorks Enclosure 4200 Family LVD Disk Enclosure User Guide

Power Supplies

In a single power supply configuration, the failure of a power supply disables the

enclosure. Use the optional redundant power supply configuration to prevent this. In this

configuration, the failure of a single power supply or blower does not disable the

enclosure.

Data Integrity

Data integrity could be compromised if data transfers occur when there is no DC power to

the I/O module or the drives, To avoid inducing errors, the power pins on these elements

are longer than the data pins. This ensures that power is always present when a data

transfer occurs.

Status Monitoring and Display

The major status monitoring capabilities of these enclosures include:

■ Displaying the enclosure status on the enclosure LEDs

■ Displaying the element status on the power supply, EMU, drive, and I/O module LEDs

■ Detecting the installation of a blower, power supply, disk drive, or I/O module

■ Detecting the blower removal of a blower, power supply, disk drive, or I/O module

■ Sensing enclosure temperatures

■ Sensing power supply voltage, current, and total power

Enclosure Layout

The physical layout of the enclosure is the same in a rack or a tower. The drives mount in

the bays in the front of the enclosure. These bays are numbered from the left (bay

) to

the right (see Figure 1–5 and Figure 1–3). The common method of referring to a drive is

by the bay number. The drive in bay

is drive 1, the drive in bay is drive 8, and so

forth.

CAUTION: There is no direct correlation between the bay number and SCSI bus ID.

The SCSI bus IDs are a function of the bus type (single or dual) and the number of

drives See Chapter 3 for SCSI bus IDs.

Introducing the Enclosure 1–5

— Drive Bays

— Enclosure Status LEDs

(see Figure 1–4)

Figure 1–3. 14-drive enclosure bays

CXO6728A

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

1–6 Compaq StorageWorks Enclosure 4200 Family LVD Disk Enclosure User Guide

The enclosure status LEDs are located in the front, lower-right corner of the enclosures

(see

Figure 1–4).

The I/O module, power supplies, blowers, EMU, and cables mount in the rear of the

enclosure (see Figure 1–5).

Enclosure Status (FLASHING)

Enclosure Power (O

N)

Enclosure Fault (O

FF)

Figure 1–4. Enclosure status LEDs

EMU

Blower 1

Power Supply Bay 1, or

Blower Mounting Assembly

1

Blower 2

Power Supply Bay 2

Single- or Dual-Bus I/O

Module

Figure 1–5. Rear -mounted elements

1. In a single power supply configuration, the blower mounts on the blower mounting assembly.

CXO6979A

1

2 3 4 5 6

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