Enclosure 4200 Family
LVD Disk Enclosure
User Guide
Part Number: EK–SW2ZS–UA. B01 / 148451-002
Second Edition (December 1999)
Part Number: EK–SW2ZS–UA. B01 / 148451-002
Compaq Computer Corporation
Notice
While Compaq Computer Corporation believes the information included in this manual is correct as
of the date of publicat ion, it is subject to change without notice. Compaq mak es no representations
that the int erconn ect i on of its pr oduc ts in the manner descri be d in this doc umen t wil l not inf ringe on
existi ng o r fut ure paten t r ight s, nor do th e de scri pti ons co nt ained in thi s docu ment imp ly the gr ant ing
of licenses to make , use, or sell equipment or software in accordance w ith the description. N o
responsibility is assumed for the use or relia bility of the firmwa re on equipmen t not supplied by
Compaq or it s affil iated comp anies. Posse ssion, 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.
© 1999 Digital Equipment Corporation.
All right s reserved . Pr in te d in the U.S .A .
Compaq, StorageWorks w ordmark, D IGITAL, and StorageWork s
Registered in United States Pa tent and Trademarks O ffice and other ju risdicti ons.
All other trademar ks and registered trademarks are the propert y of their respecti ve owners.
Compaq StorageWorks Enclosure 4200 Family LVD Disk Enclosure User Guide
Second Edition (December 1999)
Part Number: EK–SW2ZS–UA. B01 / 148451-002
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
Contents
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 Displa ys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
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
Contents v
Glossary
Index
vi Compaq Enclosure 4200 Family LVD Disk Enclosure User Guide
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 ca ble 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
Figures
Table 1–1 CRU Replacement Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–8
Table 2–1 Encl osure –Host Controller Maximum Cable Lengths . . . . . . . . . . . . . . . . . 2–3
Table 2–2 Drive Enclo s ur e—Host C on t rol l er S CSI Cable s . . . . . . . . . . . . . . . . . . . . . 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 Dis plays . . . . . . . . . . . . . . . . . . . . . . . . . 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 Pr oce dure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7–9
Table 7–6 I/O Module Replacement P r ocedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
Tabl es vii
Tables
About This Guide
Intended Audience
This publication is designed for use by Com paq StorageWorks user s who are responsible for installing
and maintaining the rack mounted (models 4214R and 4254R) and the tower mo unted (models 4214T,
and 4254T) Ultra2 SCSI low voltage differential (LVD) disk enclosures.
How this Guide is Arranged
This manual disc usses 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 element s.
Chapter 2, “Starting the Enclosure”
This chapter disc usses operating an LVD disk enclosure.
Chapter 3, “I/O Modules”
This chapter disc usses 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 desc ribes the EMU and the high av ailabili ty 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 repla cing customer replaceable units (CRUs).
Appendix A, “Regulatory Notices”
This appendix defines the country-specific regulato ry st andards for this product.
Appendix B, “Specifications”
This appendix describes the phys ica l, environmental, and ele ctrical specifications of the LVD disk
enclosure and elements.
Glossary
The glossary defines terms common to t his product.
Index
An alphabetical refe rence 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
Boldfa c e ty p e—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 1 Text Symbols (Continued)
Status LED Symbols
LED is OFF.
LED is O
N.
LED is F
LASHING
Table 2 is a list of the symbols that appear on devices and in this publication.
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.
EMU Symbols
I/O Module Symbols
About This Guide xiii
Table 2 Device Symbols (Continued)
EMU Status LED symbol (green)
Power Statu s (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
xiv Compaq Enclosure 4200 Family LVD Disk Enclosure User Guide
Related Documents
Table 3 lists publications that contain additional informati on 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
Compaq StorageWorks
Disk Enclosure RETMA Rack Mounting Template
Hot-Pluggable Wide-Ultra2 SCSI Hard Drives Installation Card
127430-001
102943-001
386195-001
Compaq StorageWorks
Replacing a Disk Enclosure Environmental Monitoring Unit Installation Guide
Compaq StorageWorks
Replacing a Disk Enclosure Power Supply Installation Guide
Compaq StorageWorks
Replacing a Disk Enclosure Ultra2 SCSI I/O Module Installation Guide
Compaq StorageWorks
Replacing a Disk Enclosure Variable Speed Fan Installation Guide
Compaq StorageWorks
Tower Model 4200T-Series User Guide
148455-001
148454-001
148453-001
148452-001
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-Ultra 2 small computer system interface (SCSI )
protocols. The internal bus supports only LVD drives. The external bus (the enclosure to
the host controller bus) support s 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 ef ficient means of transferring data.
Figure 1–1. 14-drive enclosure
CXO6854A
1–2 Compaq StorageWorks Enclosure 4200 Family LVD Disk Enclosure User Guide
CXO7082A
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. Thes e en cl o s ur es are available in eith er a
rack mountable version (4214R) or in a tower version (4214T). A rack (cabinet) mounted
enclosure requires a RE TMA 3U vertical opening (5.25-i nches) 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 provi des s everal features, including:
■ Hot-pluggable drives, envir onmenta l monitoring un i t (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 cabl es require stopping all data trans f ers , 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.
SCSI Buses
Introducing the Enclosure 1–3
These encl o su r es 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 con nec tors. A
blower guide post on the blower ensures that the blower properly mates with the power
supply. The elements an d th e metal enclosur e provid e electromagnetic interference
(EMI) suppression and control air flow within the enclosure.
The enclosure supports only Wide-Ultra2 SCSI, wide (16-bit), internal LVD buses.
Depending on the host int erfac e, the e xte rnal SCSI b us , the b us from the I/O modul e 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 cabl e, the mo r e efficient the bus ope ration .
Each enclosure has two internal SCSI buses, with half of the devices on each bus. The
single-b us I/O modu le place s al l the devices o n a si ngle-b us of eit her 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 availabil ity features of t he e nclosure are a function of the blowers and the power
supplies.
Variable Speed Blowers
All enclosures have two variable speed blo w ers. In all configurations, the failure of one
blower automatically causes the other blower to operate at a high speed. This ens ures that
the failure of a single b lower does not di sable the enclosure .
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.
1–4 Compaq StorageWorks Enclosure 4200 Family LVD Disk Enclosure User Guide
Power Supplies
In a single pow er s upply configura tion, the fail ure of a po wer supply disabl es the
enclosure. Use the optional redundant power supply configuration to prevent this. In this
config uration, the failure of a single power sup ply or blower does not disable the
enclosure.
Data Integrity
Data inte grity could b e c ompromised if dat a transfers occ ur when there is no DC powe r to
the I/O module or the drives, To avoid inducing error s, the power pins on thes e el ements
are longer than th e 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 t he power supply, EMU, drive, and I/O module LEDs
■ Detecting the installation of a blo w er, power suppl y, disk drive, or I/O module
■ Detecting the blower removal of a blower, power supply, disk drive, or I/O module
■ Sensing enclos ure te mperatures
■ Sensing power sup ply voltage, curre nt, and total po wer
Enclosure Layout
The physical la yout of the enclosure is th e same in a rack or a tower. The dri ves mount in
the bays in the front of the enclosure. These bays are numbered from the left (bay
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
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.
1
is drive 1, the drive in bay 8 is drive 8, and so
1
) to
1
3
5
2
4
Figure 1–3. 14-drive enclosure bays
7
9
6
8
11
10
12
13
14
15
CXO6728A
Introducing the Enclosure 1–5
1—-
Drive Bays
?
— Enclosure Stat us LEDs
(see Figure1–4)
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).
Enclosure Status (FLASHING)
Enclosure Power (O
Enclosure Fault (O
Figure 1–4. Enclosure status LEDs
N)
FF)
The I/O module, po wer supplies, blo w ers, EMU, and cables mount in the rear of the
enclosure (see Figure 1–5).
1
EMU
2
Blower 1
3
Power Supply Bay 1, or
Blower Mounting Assembly
4
Blower 2
5
Power Supply Bay 2
6
Single- or Dual-Bus I/O
1
Module
1
2 3 4 5 6
CXO6979A
Figure 1–5. Rear -mounted elements
1. In a singl e power supply configuration, the blower mount s on the blow er mounting assembly.
Major Elements
The elements required fo r p roper oper ation of each enclosure include:
■ An EMU
■ Two power supplies, or
1 power supply a nd 1 blower mounting asse mb ly
■ Tw o b low ers
■ A single- or a dual-bus I/ O modul e
■ A dis k drive or disk driv e blank in each bay
Element Functions
A full description of the individual elements an d their functions can be found in the
individual chapters.
Element Replacement
The methods used to replace an element depend upon the following factors:
■ Coul d element replacement affect SCSI bus operation?
When the element being rep laced does not interrupt data transfer nor affect the
operat io n of an o th e r el em en t, the element is “hot-pluggable.”
Introducing the Enclosure 1–7
If replacement of the element, could affect data transfers or the operation of another
element, the element replace me nt method is “pluggable.”
■ Are there any personal safety issues involved?
Whenever there is an issue involving personal safety, such as an electrical hazard, then
the element replacemen t r equires stopping all data t r ansfers the SCSI b u s and
removing power from the enclosure.
■ Are special tools or techniques required?
When element replacement can be completed without employing special tools or
techniques, then the element is a customer replaceable unit (CRU).
When special tool s or techniques are required to replace an element, then the unit is a
field repla ce able unit (FRU). Only qualified, Compaq field service personnel are
authorized to replace FRUs. There are no FRUs for these products.
Table 1–1 identifies the rep lacement method for each el ement.
1–8 Compaq StorageWorks Enclosure 4200 Family LVD Disk Enclosure User Guide
Tab l e 1 –1 CRU Replacement Methods
Element Method
Drive
Hot-pluggable
EMU
Blower
I/O Module
Power Supply–Dual
Power Supply–Single
SCSI Bus Cables
1. Replacing an I/O module requires stopping all data transfers.
2. In a singl e power supply configuratio n, the enclosure is disabled when th e power
supply fails.
3. Connecti n g or disconnecting a SCSI bus cable re quires stopping all dat a transfers.
Hot-pluggable
Hot-pluggable
Pluggable
Hot-pluggable
No Power Applied
Pluggable
1
3
2
With the enclosure ins talle d in a a r ack or tow er it is necessary t o :
1. Connect the SCS I bus cables.
2. Apply power.
3. Verify proper operation.
Connecting the SCSI Bus Cables
Connecting the enclosure to a host adapter or S CSI bus controll er is si mply a matter of
connecting cables to the I/O module. All I/O modul es have 68-pin, very high density
cable int e rco n nect (VHDCI) connectors.
Chapter 2
Starting the Enclosure
Figure 2 –1 shows the cable connectors for a single-bus configuration. Figure 2–2 sh ow s
the connectors for a dual-bus configuration.
CAUTION: Connecting or disconnecting a SCSI bus cable while data is being
transferred causes the loss of data.
To prevent errors, always stop all data transfers on the SCSI bus before connecting or
disconnecting a cable.
2–2 Compaq StorageWorks Enclosure 4200 Family LVD Disk Enclosure User Guide
3
1
2
3
CXO7062A
SCSI Bus A connector
Figure 2–1. Single-bus I/O module cable connector
Starting the Enclosure 2–3
.
2
SCSI Bus A connector
4
SCSI Bus B connector
1
2
3
4
CXO7063A
Figure 2–2. Dual-bus I/O module cable connectors
The maximum cable length is a function of the bus type (LVD or SE). See Table 2–1 for
the maximum Compaq supported SCSI bus cable lengths.
Table 2–1 Enclosure–Host Controller Maximum Cable Lengths
Bus Type Speed Cable Length
LVD Bus
Wide Ultra SCSI
Wide Ultra2 SCSI
Single-Ended Bus
Wide Ultra SCSI
40 Mb/s 12 m (39.4 ft)
80 Mb/s 12 m (39.4 ft)
40 Mb/s 3.7 m (12 ft)
2–4 Compaq StorageWorks Enclosure 4200 Family LVD Disk Enclosure User Guide
Table 2–2 describes the compatible host controller to LVD disk enclosure cables.
Table 2–2 Drive Enclosure—Host Controller SCSI Cables
Description Lengt h
SCSI Cable—68-pin VHDCI to 68-pin VHDCI
68-conductor SCSI cable with:
2—VHDCI straight male connectors with thumb screws.
SCSI Cable—68-pin VHDCI to 68-pin VHDCI
68-conductor SCSI cable with
2 Vertical Offset VHDCI straight plug connectors with jack screws
3 m (9.8 ft)
CXO5702B
3.7 m (12 ft)
CXO6954A
Starting the Enclosure 2–5
Table 2–2 Drive Enclosure—Host Controller SCSI Cables (Continued)
Description Lengt h
Adapter Cable—68-pin High Density to 68-pin VHDCI
68-conductor SCSI cable with
1 High-Density straight plug connector with jack screws
1 Vertical Offset VHDCI straight plug connector with jack screws
3.7 m (12 ft)
CXO6955A
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