Enclosure 4200 Family
LVD Disk Enclosures
User Guide
First Edition (July 1999)
Part Number: EK–SW2ZS–UG. A01 / 148451–001
Compaq Computer Corporation
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Contents
About This Guide
Chapter 1
Introducing the Enclosure
Disk Enclosure Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2
SCSI Buses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3
High Availability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3
Variable Speed Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3
Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3
Data Integrity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3
Status Monitoring and Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4
Enclosure Layout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4
Major Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–6
Element Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–6
Element Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–6
Chapter 2
Starting the Enclosure
Connecting the SCSI Bus Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–1
Applying Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–4
Verifying Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–4
Chapter 3
I/O Module
Module Power Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2
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Enclosure 4200 Family LVD Disk Enclosures Users Guide
Single-Bus Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2
SCSI Bus Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–3
SCSI Bus Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–3
Status Displays. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–3
SCSI Address Map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–4
Replacing an I/O Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–4
Chapter 4
Disk Drives
Status Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–2
Disk Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–2
Drive Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–4
Drive Blank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–4
Replacing a Disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–5
Chapter 5
Enclosure Power and Cooling
Enclosure Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–2
Power Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–2
Temperature Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–3
Fan Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–3
Fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–3
Status Reporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–4
Replacing a Power Supply or Fan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–4
Chapter 6
Replacing CRUs
Ordering a Spare CRU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–1
ESD Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–2
Basic Replacement Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–2
Replacing a Drive with a Drive Blank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–4
Appendix A
Regulatory Notices
FCC Class B Certification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–1
Country-Specific Certifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–2
Appendix B
Specifications
Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–1
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Contents
v
Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–4
Power Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–5
Glossary
Index
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List of Figures
Figure 1–1. Disk Enclosure (Front View) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–1
Figure 1–2. Disk Enclosure (Rear View) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–2
Figure 1–3. Front Mounted Elements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–5
Figure 1–4. Rear Mounted Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–5
Figure 2–1. Single Bus Cable Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2
Figure 2–2. Front Status LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5
Figure 2–3. Rear Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–5
Figure 3–1. Single-Bus I/O Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–2
Figure 3–2. Single Bus Status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–3
Figure 4–1. Typical 1-Inch Disk Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1
Figure 4–2. Disk Drive LEDs Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–2
Figure 4–3. Drive Blank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–4
Figure 5–1. Power Supply and Fan Assembly Components . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–1
Figure 6–1. Typical Product Label. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–1
Figure A–1. Typical Product Label Country-Specific Certifications. . . . . . . . . . . . . . . . . . . . . A–2
Figure B–1. Dimensions–Vertical Orientation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–2
Figure B–2. Dimensions–Horizontal Orientation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–2
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List of Tables
Table 1 Documentation Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii
Table 2 Related Publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv
Table 1–1 CRU Replacement Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–6
Table 2–1 SCSI Bus Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2
Table 2–2 Installing SCSI Bus Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–4
Table 3–1 Single-Bus Module LED Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–4
Table 3–2 Disk Enclosure Bay Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3–4
Table 4–1 Disk LED Status Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–2
Table 5–1 Power Supply and Fan Status Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5–4
Table 6–1 Common Replacement Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–2
Table 6–2 Installing a Drive Blank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–4
Table B–1 14-Disk Enclosure Physical Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–3
Table B–2 Element Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–3
Table B–3 Operating Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–4
Table B–4 Shipping or Short Term Storage Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–4
Table B–5 AC and DC Power Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B–5
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About This Guide
Intended Audience
This publication is designed for use by Compaq StorageWorks users who are responsible
for installing and maintaining the Model 4214R (rack) and 4214T (tower) 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 Module”
This chapter discusses the I/O modules functions, operation, and status displays.
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Enclosure 4200 Family LVD Disk Enclosures Users Guide
Chapter 4, “Disk Drives”
This chapter describes the disk drives, operation, and status reporting.
Chapter 5, “Enclosure Power and Cooling”
The chapter describes the power supply and fan operation and status reporting.
Chapter 6, “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.
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xiii
Documentation Conventions
The documentation conventions used in this publication are shown in Table 1.
Table 1 Documentation Conventions
Symbol
Description
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.
Caution
Text symbol for information essential to avoid damaging software, hardware, or
data.
Note
Notes contain information of special interest.
WARNING
Text symbol for actions required to prevent the possibility of personal injury.
Enclosure and EMU LED label
(Symbol definitions follow.)
Enclosure Status LED symbol (green)
Enclosure Power Status LED symbol (green)
NOTE: This LED symbol is not the same as the text symbol for an
action required to prevent the possibility of personal injury.
Enclosure Fault LED symbol (amber)
I/O module LED label
Terminator Status LED (green)
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Enclosure 4200 Family LVD Disk Enclosures Users Guide
Table 1 Documentation Conventions (Continued)
Symbol
Description
I/O module LED label
Power Status (ON) or EMU Locate (FLASHING) LED (green)
I/O module label
Ultra2 SCSI, Single Bus, LVD input connector
Light emitting diode (LED) is OFF.
LED is FLASHING.
LED is ON.
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xv
Related Documents
Table 2 lists publications that contain additional information relevant to the LVD disk
enclosure products.
Table 2 Related Publications
StorageWorks Publication Title
Part Number
127430-001
102943-001
Disk Enclosure RETMA Rack Mounting Kit Installation Card
Disk Enclosure RETMA Rack Mounting Template
Environmental Monitoring Unit for
Enclosure Models 4214R and 4214T User Guide
122941-001
Hot-Pluggable Wide-Ultra2 SCSI Hard Drives Installation Card
Replacing a Disk Enclosure Environmental Monitoring Unit Installation Guide
Replacing a Disk Enclosure Power Supply Installation Guide
Replacing a Disk Enclosure Ultra2 SCSI I/O Module Installation Guide
Replacing a Disk Enclosure Variable Speed Fan Installation Guide
Tower Model 4200T-Series User Guide
386195-001
148455-001
148454-001
148453-001
148452-001
122942-001
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Chapter
1
Introducing the Enclosure
This chapter describes of 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.
CXO6854A
Figure 1–1. Disk Enclosure (Front View)
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1–2
Enclosure 4200 Family LVD Disk Enclosures User Guide
CXO6912A
Figure 1–2. Disk Enclosure (Rear View)
Disk Enclosure Features
The Model 4214 enclosure supports up to fourteen, 1-inch high, 3.5-inch form factor
hard disk drives. This enclosure is available in either a rack mountable version (4214R)
or in a tower (4214T). A rack (cabinet) mounted enclosure requires a RETMA 3U vertical
opening (5.25-inches) where a “U” is 1.75-inches.
The enclosure provides several features, including:
■ Hot-pluggable drives, environmental monitoring unit (EMU), fans, and power
supplies are replaceable without halting SCSI bus data transfers.
■ Pluggable I/O module and SCSI bus cables require quiescing the bus (that is,
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-Ultra SCSI (LVD) or Wide-Ultra SCSI (SE) bus operations.
■ Depending upon the host-interface controller, an EMU may support the automatic
monitoring of specific enclosure and drive functions.
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 guide
post on the fan ensures that the fan properly mates with the power supply. The elements
and the metal enclosure provide electromagnetic interference (EMI) suppression and
control airflow within the enclosure.
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Introducing the Enclosure 1–3
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.
High Availability
The high availability features of the enclosure are a function of the fans and the power
supplies.
Variable Speed Fans
All enclosures have two variable speed fans. In all configurations, the failure of one fan
automatically causes the other fan to operate at a high speed. This ensures that the failure
of a single fan does not disable the enclosure.
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 fan 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.
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Enclosure 4200 Family LVD Disk Enclosures User Guide
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 fan, power supply, drive, or I/O module
■ Detecting the removal of a fan, power supply, drive, or I/O module
■ Sensing enclosure temperatures
■ Sensing power supply voltage, current, and total power
The EMU user guide describes the functions and features of the EMU.
Enclosure Layout
The physical layout of the enclosure is the same whether 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 (bay , see Figure 1–3). The common method of referring to a drive
is by the bay number. The drive in bay
forth.
is drive 1, the drive in bay
is drive 8, and so
At location
are the three enclosure status LEDs.
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Introducing the Enclosure 1–5
1
3
5
7
2
9
4
11
6
13
8
10
12
15
14
CXO6728A
Figure 1–3. Front Mounted Elements
The I/O module, power supplies, fans, EMU, and cables mount in the rear of the enclosure
(see Figure 1–4).
1
2
3
4
5
6
CXO6979A
EMU
Fan 2
Fan 1
Power Supply Bay 2
I/O Module
Power Supply Bay 1, or
1
Fan Mounting Assembly
1. In a single power supply configuration, the fan mounts on the fan mounting assembly.
Figure 1–4. Rear Mounted Elements
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1–6
Enclosure 4200 Family LVD Disk Enclosures User Guide
Major Elements
The elements each enclosure requires for proper operation include:
■ An EMU
■ Two power supplies, or
1 power supply and 1 fan mounting assembly
■ Two Fans
■ An I/O module
■ A disk drive or disk drive blank in each bay
Element Functions
A full description of the individual elements and their functions can be found in the
individual chapters.
Element Replacement
The methods used to replace an element depend upon several factors. The primary factors
are:
■ Could element replacement affect SCSI bus operation?
When the element being replaced does not interrupt data transfer nor affect the
operation of another element, the element is “hot-pluggable.”
If replacement of the element could affect data transfers or the operation of another
element, the element replacement 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 replacement requires quiescing the SCSI bus and removing power from the
enclosure.
Table 1–1 identifies the replacement method and type of replacement for each element.
Table 1–1 CRU Replacement Methods
Element
Method
Drive
EMU
Hot-pluggable
Hot-pluggable
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Introducing the Enclosure 1–7
Table 1–1 CRU Replacement Methods (Continued)
Element
Method
Fan
Hot-pluggable
I/O Module
Power Supply–Dual
Hot-pluggable
Hot-pluggable
1
Power Supply–Single
SCSI Bus Cables
No Power Applied
Pluggable
1. In a single power supply configuration, the enclosure is disabled when the power
supply fails.
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Chapter
2
Starting the Enclosure
With the enclosure installed in a rack or tower it is necessary to:
1. Connect the SCSI bus cables.
2. Apply power.
3. Verify proper operation.
Connecting the SCSI Bus Cables
Connecting the enclosure to a host adapter or SCSI bus controller is simply a matter of
connecting cables to the I/O module. All I/O modules has 68-pin, very high density
computer interface (VHDCI) connectors.
Figure 2–1 shows the cable connectors for a single bus configuration.
CAUTION: Connecting or disconnecting a SCSI bus cable while data is being
transferred causes the loss of data.
To prevent inducing an error, always quiesce the SCSI bus before connecting or
disconnecting a cable.
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2–2
Enclosure 4200 Family LVD Disk Enclosures User Guide
1
CXO6980A
Primary host controller connector
Figure 2–1. Single Bus Cable Connection
Table 2–1 lists the host array controller cables available. As for any SCSI bus, using the
shortest length cable possible enhances performance.
Table 2–1 SCSI Bus Cables
Length
Description
68-conductor SCSI cable with
Meters
Feet
Part Number
1.8
3.7
11.9
6
12
39
332616-001
1
2 Vertical Offset VHDCI straight plug connectors
with jack screws
332616-002
2
150214-B21
CXO6954A
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Starting the Enclosure 2–3
Table 2–1 SCSI Bus Cables (Continued)
Length
Meters
Description
68-conductor SCSI cable with
Feet
Part Number
1.8
3.7
6
12
110941-001
1
1 High-Density straight plug connector with jack
110941-002
screws
1 Vertical Offset VHDCI straight plug connector with
jack screws
CXO6955A
1. One cable provided with each enclosure.
2. Use only with Ultra2 SCSI LVD bus operating at speeds of 80 Mb/sec or less.
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2–4
Enclosure 4200 Family LVD Disk Enclosures User Guide
Table 2–2 Installing SCSI Bus Cables
1. Stop all SCSI bus data transfers.
2. Align the D-shaped cable connector with D-shaped I/O module connector.
CXO6981A
3. Firmly seat the cable connector on the module connector.
4. Finger tighten the thumbscrews to fully seat the connector.
5. Restart data transfers over the SCSI bus.
Applying Power
There are no disk enclosure power control switches. Connecting an AC power cord from a
power source to the power supply is all that is required. When a power supply has an AC
input, it develops and distributes DC voltages within the enclosure.
Verifying Operation
Applying power causes the elements to begin operating. Check the enclosure status LEDs
in the front, lower right corner (see Figure 2–2). If the display is not exactly as shown,
there is an element error condition. Check the drive and enclosure status LEDs on the front
and the EMU, power supplies, fans, and I/O module status LEDs on the rear (see
Figure 2–3) to determine the defective element.
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