Supero 2027B-DE2R24L User manual

®
SUPER
USER’S MANUAL
1.0a
SUPER STORAGE SYSTEM
2027B-DE2R24L

The information in this User’s Manual has been carefully reviewed and is believed to be accurate.
The vendor assumes no responsibility for any inaccuracies that may be contained in this document,
makes no commitment to update or to keep current the information in this manual, or to notify any
person or organization of the updates. Please Note: For the most up-to-date version of this
manual, please see our web site at www.supermicro.com.
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Any use or reproduction of this product is not allowed, except as expressly permitted by the terms
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claims will not exceed the price paid for the hardware product.
FCC Statement: This equipment has been tested and found to comply with the limits for a Class A
digital device pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment is operated in a commercial environ-
ment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with the manufacturer’s instruction manual, may cause harmful interference
with radio communications. Operation of this equipment in a residential area is likely to cause harm-
ful interference, in which case you will be required to correct the interference at your own expense.
California Best Management Practices Regulations for Perchlorate Materials: This Perchlorate warn-
ing applies only to products containing CR (Manganese Dioxide) Lithium coin cells. “Perchlorate
Material-special handling may apply. See www.dtsc.ca.gov/hazardouswaste/perchlorate”
WARNING: Handling of lead solder materials used in this
product may expose you to lead, a chemical known to the
State of California to cause birth defects and other repro-
ductive harm.
Manual Revision 1.0a
Release Date: July 15, 2014
Unless you request and receive written permission from Super Micro Computer, Inc., you may not
copy any part of this document.
Information in this document is subject to change without notice. Other products and companies
referred to herein are trademarks or registered trademarks of their respective companies or mark
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Copyright © 2014 by Super Micro Computer, Inc.
All rights reserved.
Printed in the United States of America

iii
Preface
Preface
About This Manual
This manual is written for professional system integrators and PC technicians. It
provides information for the installation and use of the 2027B-DE2R24L. Installation
and maintainance should be performed by experienced technicians only.
The 2027B-DE2R24L is a high-end storage server solution based on the SC927 3U
rackmount chassis and the X9DBS-F dual processor serverboard.
Manual Organization
Chapter 1: Introduction
The rst chapter provides a checklist of the main components included with the
server system and describes the main features of the X9DBS-F serverboard and
the SC927ETS-R1200NDBP chassis.
Chapter 2: Server Installation
This chapter describes the steps necessary to install the 2027B-DE2R24L into a
rack and check out the server conguration prior to powering up the system. If your
server was ordered without processor and memory components, this chapter will
refer you to the appropriate sections of the manual for their installation.
Chapter 3: System Interface
Refer here for details on the system interface, which includes the functions and
information provided by the control panels on the chassis as well the HDD carrier
LEDs.
Chapter 4: Standardized Warning Statements
You should thoroughly familiarize yourself with this chapter for a general overview
of safety precautions that should be followed when installing and servicing the
2027B-DE2R24L.

SUPERSTORAGESYSTEM 2027B-DE2R24L User's Manual
iv
Chapter 5: Advanced Serverboard Setup
Chapter 5 provides detailed information on the X9DBS-F serverboard, including the
locations and functions of connections, headers and jumpers. Refer to this chapter
when adding or removing processors or main memory and when reconguring the
serverboard.
Chapter 6: Advanced Chassis Setup
Refer to Chapter 6 for detailed information on the SC937 server chassis. You should
follow the procedures given in this chapter when installing, removing or recongur-
ing SAS/SATA or peripheral drives and when replacing system power supply units
and cooling fans.
Chapter 7: BIOS
The BIOS chapter includes an introduction to BIOS and provides detailed informa-
tion on running the CMOS Setup Utility.
Appendix A: BIOS Error Beep Codes
Appendix B: System Specications

Notes
Preface
v

vi
Table of Contents
Chapter 1 Introduction
1-1 Overview ......................................................................................................... 1-1
1-2 Serverboard Features ..................................................................................... 1-2
Processors ...................................................................................................... 1-2
Memory ........................................................................................................... 1-2
SAS Disk Controller ........................................................................................ 1-2
SAS Expander................................................................................................. 1-2
SATA .............................................................................................................. 1-2
NTB Connectivity ............................................................................................ 1-2
PCI Expansion Slots ....................................................................................... 1-2
Rear Chassis Ports ......................................................................................... 1-3
Graphics Controller ......................................................................................... 1-3
1-3 Server Chassis Features ................................................................................ 1-3
System Power................................................................................................. 1-3
SAS Subsystem .............................................................................................. 1-3
Front Control Panel......................................................................................... 1-3
Cooling System............................................................................................... 1-3
1-4 Contacting Supermicro.................................................................................... 1-5
1-5 SBB: Storage Bridge Bay ............................................................................... 1-6
Chapter 2 Server Installation
2-1 Overview ......................................................................................................... 2-1
2-2 Unpacking the System .................................................................................... 2-1
2-3 Preparing for Setup......................................................................................... 2-1
Choosing a Setup Location............................................................................. 2-1
2-4 Warnings and Precautions.............................................................................. 2-2
Rack Precautions............................................................................................ 2-2
Server Precautions.......................................................................................... 2-2
Rack Mounting Considerations ....................................................................... 2-3
Ambient Operating Temperature ................................................................ 2-3
Reduced Airow ......................................................................................... 2-3
Mechanical Loading ................................................................................... 2-3
Circuit Overloading..................................................................................... 2-3
Reliable Ground ......................................................................................... 2-3
2-5 Installing the System into a Rack ................................................................... 2-4
Installing the Inner Rack Rails ........................................................................ 2-4
Installing the Outer Rack Rails ....................................................................... 2-5
Installing the Chassis into a Rack................................................................... 2-6
SUPERSTORAGESYSTEM 2027B-DE2R24L User's Manual

vii
Chapter 3 System Interface
3-1 Overview ......................................................................................................... 3-1
3-2 Control Panel Button....................................................................................... 3-1
3-3 Control Panel LEDs ........................................................................................ 3-1
3-4 Drive Carrier LEDs.......................................................................................... 3-3
Chapter 4 Standardized Warning Statements for AC Systems
4-1 About Standardized Warning Statements....................................................... 4-1
Warning Denition........................................................................................... 4-1
Installation Instructions.................................................................................... 4-4
Circuit Breaker ................................................................................................ 4-5
Power Disconnection Warning ........................................................................ 4-6
Equipment Installation..................................................................................... 4-8
Restricted Area................................................................................................ 4-9
Battery Handling............................................................................................ 4-10
Redundant Power Supplies .......................................................................... 4-12
Backplane Voltage ........................................................................................ 4-13
Comply with Local and National Electrical Codes........................................ 4-14
Product Disposal........................................................................................... 4-15
Hot Swap Fan Warning................................................................................. 4-16
Power Cable and AC Adapter ...................................................................... 4-18
Chapter 5 Advanced Serverboard Setup
5-1 Handling the Serverboard ............................................................................... 5-1
Precautions ..................................................................................................... 5-1
5-2 Cable and Device Connectiions...................................................................... 5-2
Power Connections .................................................................................... 5-2
Fan Cabling................................................................................................ 5-2
Control Panels............................................................................................ 5-2
5-3 Installing the Processor and Heatsink ............................................................ 5-3
Installing an LGA 1356 Processor .................................................................. 5-3
Installing a CPU Heatsink ............................................................................... 5-5
Removing the Heatsink................................................................................... 5-5
5-4 Installing Memory............................................................................................ 5-6
Memory Support.............................................................................................. 5-6
DIMM Installation ............................................................................................ 5-6
DIMM Module Population Conguration ......................................................... 5-7
Installing NVDIMMs......................................................................................... 5-8
5-5 Installing PCI Add-On Cards........................................................................... 5-9
5-6 Serverboard Details ...................................................................................... 5-10
X9DBS-F Quick Reference ............................................................................5-11
Table of Contents

viii
5-7 Connector Denitions ................................................................................... 5-12
5-8 Jumper Settings ............................................................................................ 5-14
5-9 Onboard Indicators........................................................................................ 5-16
5-10 Serial ATA Ports ............................................................................................ 5-17
5-11 Installing Software......................................................................................... 5-18
SuperDoctor III.............................................................................................. 5-19
5-12 Onboard Battery............................................................................................ 5-20
Chapter 6 Advanced Chassis Setup
6-1 Static-Sensitive Devices.................................................................................. 6-1
Precautions ..................................................................................................... 6-1
Unpacking ....................................................................................................... 6-1
6-2 Control Panel .................................................................................................. 6-2
6-3 System Fans ................................................................................................... 6-2
System Fan Failure......................................................................................... 6-3
Replacing System Fans .................................................................................. 6-3
6-4 Drive Bay Installation/Removal ....................................................................... 6-5
Accessing the Drive Bays ............................................................................... 6-5
Hard Drive Midplane ....................................................................................... 6-5
SAS 3.0 Controller .......................................................................................... 6-5
SAS Drive Installation ..................................................................................... 6-5
6-5 Midplane.......................................................................................................... 6-8
6-6 Power Supply.................................................................................................. 6-9
Power Supply Failure...................................................................................... 6-9
Replacing the Power Supply........................................................................... 6-9
Chapter 7 BIOS
7-1 Introduction...................................................................................................... 7-1
Starting BIOS Setup Utility.............................................................................. 7-1
How To Change the Conguration Data ......................................................... 7-2
Starting the Setup Utility ................................................................................. 7-2
7-2 Main Setup...................................................................................................... 7-2
7-3 Advanced Setup Congurations...................................................................... 7-4
7-4 Event Logs .................................................................................................... 7-25
7-5 IPMI............................................................................................................... 7-27
7-6 Boot............................................................................................................... 7-29
7-7 Security......................................................................................................... 7-30
7-8 Save & Exit ................................................................................................... 7-31
Appendix A BIOS Error Beep Codes
Appendix B System Specications
SUPERSTORAGESYSTEM 2027B-DE2R24L User's Manual

Chapter 1
Introduction
1-1 Overview
The 2027B-DE2R24L is a high-end Super Storage Bridge Bay (SBB) system
comprised of two main subsystems: the SC927ETS-R1200NDBP chassis and two
X9DBS-F dual processor serverboards. Please refer to our web site for informa-
tion on operating systems that have been certied for use with the system (www.
supermicro.com).
In addition to the serverboard and chassis, various hardware components have
been included with the 2027B-DE2R24L, as listed below. Quantities indicate the
number included in the whole system (two nodes).
•Four passive CPU heatsinks (2x SNK-P0037P, 2x SNK-P0038P))
•Ten 4-cm counter-rotating fans (FAN-0088L4)
•Two KVM cables (CBL-0218L)
•SAS/SATA Accessories
One SAS midplane (BPN-SAS-927)
Twenty-four hard drive carriers (MCP-220-92701-0N)
•Two riser cards for PCI-Express 3.0 expansion cards (RSC-R2US-3E8R)
•Two SAS controller mezzanine cards (one per node) (AOM-S2308-L8i-SB)
•One set of rackmount hardware (MCP-290-00057-ON)
Note: For your system to work properly, please follow the links below to download
all necessary drivers/utilities and the user’s manual for your server.
•Supermicro product manuals: http://www.supermicro.com/support/manuals/
•Product drivers and utilities: ftp://ftp.supermicro.com
•Product safety info: http://super-dev/about/policies/safety_information.cfm
•If you have any questions, please contact our support team at:
[email protected]
Chapter 1: Introduction
1-1

1-2
SUPERSTORAGESYSTEM 2027B-DE2R24L User's Manual
1-2 Serverboard Features
The 2027B-DE2R24L is built around two X9DBS-F serverboards for a dual-node
system that shares storage resources as well as features a dedicated PCI-E bus
between server nodes for High Availability (HA), Cluster in a Box (CiB) applications
The X9DBS-F is a dual processor serverboard based on the Intel® C602J chipset.
Below are the main features of the X9DBS-F. (See Figure 1-1 for a block diagram
of the chipset).
Processors
The X9DBS-F supports single or dual Intel® Xeon E5-2400 of up to 95W in B2
type sockets. Two X9DBS-F boards are included in the storage system. Please
refer to the serverboard description pages on our web site for a complete listing of
supported processors (www.supermicro.com).
Memory
Each X9DBS-F has six DIMM slots that can support up to 192 GB of Registered
(RDIMM) ECC/Non-ECC DDR3-1866/1600/1333/1066/800 memory. See Chapter
5 for details.
SAS Disk Controller
Two external SAS 2.0 ports are supported by a disk controller on a mezzanine
included on each X9DBS-F (four total per system).
SAS Expander
One 36-port SAS expander is integrated into the X9DBS-F board.
SATA
Each X9DBS-F has two SATA 3.0 ports with power headers to support two SATA
Disk-on-Module (SATA DOM) devices per node. RAID 0 and 1 are supported.
NTB Connectivity
Non Transparent Bridge connectivity featuring 8 lanes of PCI-E 3.0 between server
nodes.
PCI Expansion Slots
Each X9DBS-F features one PCI-E 3.0 x24 slot for riser/expansion card support.

1-3
Chapter 1: Introduction
Rear Chassis Ports
The rear of each serverboard includes two mini SAS HD ports, two 1 GB Ethernet
ports and a KVM connector (includes USB, VGA and COM ports).
Graphics Controller
The X9DBS-F features an integrated Matrox G200eW video controller. The G200eW
is a 2D/3D/video accelerator chip with a 128-bit core.
1-3 Server Chassis Features
System Power
The 2027B-DE2R24L features a redundant Platinum Level 920W power supply
composed of two separate power modules. This power redundancy feature allows
you to replace a failed power module without shutting down the system.
SAS Subsystem
The 2027B-DE2R24L supports up to 24 2.5" SAS drives. These drives are
hot-swappable units and are connected to a midplane that provides power and
control.
Front Control Panel
Two control panels are included on each end of the 2027B-DE2R24L to provide
you with system monitoring and control. LEDs indicate system power, network
(NIC) activity, system overheat and power supply failure. Each set of LEDs are
associated with the node/serverboard on the same side of the chassis. A single
power button is located on the right side control panel. When pressed, both nodes
will power on or off.
Cooling System
The 2027B-DE2R24L chassis has ten 4-cm counter-rotating fans: six at the front
and another four at the rear of each node. This counter-rotating action works to
dampen vibration levels while generating exceptional airow.
Another set of back-to-back fans are also located on each serverboard in front of
the CPU2 socket. Each power supply module also includes a cooling fan.

1-4
SUPERSTORAGESYSTEM 2027B-DE2R24L User's Manual
Figure 1-1. Intel C602J Chipset:
System Block Diagram
Note: This is a general block diagram. Please see Chapter 5 for details.
PE1A [3..0] PE3B [7:4] PE3C [3:0]
PE3D [7:4]
PE3C [3:0] DMI2
PE3D [7:4]
PE3A [3:0]
PE3B [7:4]
PE3A [3:0]
PE1B [7..4]
PE1A [3..0]
PCI-E x8 PCI-E G2 x4
NTB x8
Mezzanine
PE1B [7..4]
DDR3 DIMM 800/1066/1333/1600
DDR3 DIMM 800/1066/1333/1600
CPU2
E5-2400 Series Processor
CPU1
E5-2400 Series Processor
F
Rear (IO Side)
E
DP0
P1
P1
P0
C
B
A
QPI
PCI-E x24 230 pins
LSI2208
LSI SASx36
SAS2 EXPD
24 PortsLED
GPIO
LSI2308
LAN1
LAN2
SAS2
REDRIVER
EXT1
SFF8644
EXT0
USB 0, 1
PCI-32-bit
SFF8644
Winbond
BMC
integrated VGA
Winbond
BMC
WPCM450
SIO
W83527HG
Front
Panel
PEX 8717
PCIe GEN3 16-lane
PWR
Swap
Back Plane
Airmax SSB MidplanePower
PCI-E x8
M1
RMII
PHY/
RTL8201F
SATA0
USB 2
TPM HDR
SAS2
REDRIVER
1G LAN
I350
8 PortsDMI2
SATA0
Supports
SATA DOM
USB
LPC
PCH
LAN
PHY12-35
4 Ports PHY32-35
4 Ports PHY0-3
DDRIII
DDRIII
USB 0~1
VGACONN
COM1
SATA1
SATA1
Supports
SATA DOM
IPMI
External

1-5
Chapter 1: Introduction
1-4 Contacting Supermicro
Headquarters
Address: Super Micro Computer, Inc.
980 Rock Ave.
San Jose, CA 95131 U.S.A.
Tel: [phone]
Fax: [phone]
Email: [email protected] (General Information)
[email protected] (Technical Support)
Web Site: www.supermicro.com
Europe
Address: Super Micro Computer B.V.
Het Sterrenbeeld 28, 5215 ML
's-Hertogenbosch, The Netherlands
Tel: [phone]
Fax: [phone]
Email: [email protected] (General Information)
[email protected] (Technical Support)
[email protected] (Customer Support)
Web Site: www.supermicro.nl
Asia-Pacic
Address: Super Micro Computer, Inc.
3F, No. 150, Jian 1st Rd.
Zhonghe Dist., New Taipei City 235
Taiwan (R.O.C)
Tel: [phone]
Fax: [phone]
Email: [email protected]
Web Site: www.supermicro.com.tw

1-6
SUPERSTORAGESYSTEM 2027B-DE2R24L User's Manual
1-5 SBB: Storage Bridge Bay
The 2027B-DE2R24L Super SBB was designed to function as a fully redundant,
fault-tolerant "cluster-in-a-box" system. The standard support for 24 2.5" hot-swap
HDDs (SAS1 or SAS2) may be expanded to support additional storage with the
optional SBB JBOD SYS-927R-E2JB conguration.
The Super SBB provides hot-swappable canisters for all active components. Each of
the two serverboard canisters support dual-processors, 6 DIMM slots, 3 PCI-E Gen2
slots and 6 Gbps SAS (SAS2). The 2027B-DE2R24L features eight lanes of PCI-E
3.0 connecting the left server module with the right server module. This connection
is used for high speed data transfers between nodes for High Availability/server
fail-over. This fail-over capability is fully dependent on the software/OS installed
and how the chosen software uses the connection (Active-Active or Active-Passive).
2027B-DE2R24L hardware is supplied without a storage OS or fail-over software.
Equipped with 920W 80PLUS Platinum Level redundant power supplies and redun-
dant cooling fans, the 2027B-DE2R24L offers fully redundant high-availability while
maintaining energy efcient operation.

Chapter 2: Server Installation
2-1
Chapter 2
Server Installation
2-1 Overview
This chapter provides a quick setup checklist to get your 2027B-DE2R24L up and
running. Following these steps in the order given should enable you to have the
system operational within a minimum amount of time. This quick setup assumes
that your system has come to you with the processors and memory preinstalled. If
your system is not already fully integrated with a serverboard, processors, system
memory etc., please turn to the chapter or section noted in each step for details on
installing specic components.
2-2 Unpacking the System
You should inspect the box the 2027B-DE2R24L was shipped in and note if it was
damaged in any way. If the server itself shows damage you should le a damage
claim with the carrier who delivered it.
Decide on a suitable location for the rack unit that will hold the 2027B-DE2R24L.
It should be situated in a clean, dust-free area that is well ventilated. Avoid areas
where heat, electrical noise and electromagnetic elds are generated. You will also
need it placed near a grounded power outlet. Read the Rack and Server Precau-
tions in the next section.
2-3 Preparing for Setup
The box the 2027B-DE2R24L was shipped in should include two sets of rail assem-
blies, two rail mounting brackets and the mounting screws you will need to install the
system into the rack. Follow the steps in the order given to complete the installation
process in a minimum amount of time. Please read this section in its entirety before
you begin the installation procedure outlined in the sections that follow.
Choosing a Setup Location
•Leave enough clearance in front of the rack to enable you to open the front door
completely (~25 inches) and approximately 30 inches of clearance in the back
of the rack to allow for sufcient airow and ease in servicing.

2-2
SUPERSTORAGESYSTEM 2027B-DE2R24L User's Manual
•This product is for installation only in a Restricted Access Location (dedicated
equipment rooms, service closets and the like).
•This product is not suitable for use with visual display work place devices
acccording to §2 of the the German Ordinance for Work with Visual Display
Units.
2-4 Warnings and Precautions
Rack Precautions
•Ensure that the leveling jacks on the bottom of the rack are fully extended to
the oor with the full weight of the rack resting on them.
•In single rack installation, stabilizers should be attached to the rack. In multiple
rack installations, the racks should be coupled together.
•Always make sure the rack is stable before extending a component from the
rack.
•You should extend only one component at a time - extending two or more si-
multaneously may cause the rack to become unstable.
Server Precautions
•Review the electrical and general safety precautions in Chapter 4.
•Determine the placement of each component in the rack before you install the
rails.
•Install the heaviest server components on the bottom of the rack rst, and then
work up.
•Use a regulating uninterruptible power supply (UPS) to protect the server from
power surges, voltage spikes and to keep your system operating in case of a
power failure.
•Allow any hot plug drives and power supply modules to cool before touching
them.
•Always keep the rack's front door and all panels and components on the servers
closed when not servicing to maintain proper cooling.

Chapter 2: Server Installation
2-3
Rack Mounting Considerations
Ambient Operating Temperature
If installed in a closed or multi-unit rack assembly, the ambient operating tempera-
ture of the rack environment may be greater than the ambient temperature of the
room. Therefore, consideration should be given to installing the equipment in an
environment compatible with the manufacturer’s maximum rated ambient tempera-
ture (Tmra).
Reduced Airow
Equipment should be mounted into a rack so that the amount of airow required
for safe operation is not compromised.
Mechanical Loading
Equipment should be mounted into a rack so that a hazardous condition does not
arise due to uneven mechanical loading.
Circuit Overloading
Consideration should be given to the connection of the equipment to the power
supply circuitry and the effect that any possible overloading of circuits might have
on overcurrent protection and power supply wiring. Appropriate consideration of
equipment nameplate ratings should be used when addressing this concern.
Reliable Ground
A reliable ground must be maintained at all times. To ensure this, the rack itself
should be grounded. Particular attention should be given to power supply connec-
tions other than the direct connections to the branch circuit (i.e. the use of power
strips, etc.).

2-4
SUPERSTORAGESYSTEM 2027B-DE2R24L User's Manual
2-5 Installing the System into a Rack
This section provides information on installing the SC937 chassis into a rack unit
with the quick-release rails provided. There are a variety of rack units on the market,
which may mean the assembly procedure will differ slightly. You should also refer to
the installation instructions that came with the rack unit you are using.
Installing the Inner Rack Rails
Installing the Inner Rails
1. Extend the inner rail toward the front of the rail assembly as far as possible,
then depress the locking tab to pull it completely out.
2. Place the inner rail on the side of the chassis aligning the hooks of the chas-
sis with the rail extension holes.
3. Slide the extension toward the front of the chassis.
4. You may secure the chassis with screws if desired.
5. Repeat steps 1-3 for the other inner rail.
Figure 2-1. Installing the Outer Rack Rails
1
2
1
3
Warning: do not pick up the server with the front handles. They are de-
signed to pull the system from a rack only.

Chapter 2: Server Installation
2-5
Figure 2-2. Outer Rack Rails
Figure 2-3. Outer Rack Rail Install
Installing the Outer Rack Rails
Outer rails attach to the server rack and hold the server in place. The outer rails for
the SC937 chassis extend between 30 inches and 33 inches.
Installing the Outer Rails
1. Attach the right outer rail to the rack by inserting the hooks included on the
rails into the holes provided on the rack.
2. If desired, screw the rails to the chassis for added support.
3. Repeat these steps for the left outer rail.
Stability hazard. The rack stabilizing mechanism must be in place, or the
rack must be bolted to the oor before you slide the unit out for servicing.
Failure to stabilize the rack can cause the rack to tip over.
Slide rail mounted equipment is not to be used as a shelf or a work space.

2-6
SUPERSTORAGESYSTEM 2027B-DE2R24L User's Manual
Figure 2-3. Installing the Chassis into the Rack
Installing the Chassis into a Rack
Installing into a Rack
1. Conrm that the inner and outer rails are properly installed.
2. Line up the inner (chassis) rails with the front of the outer (rack) rails.
3. Slide the chassis rails into the rack rails, keeping the pressure even on both
sides (you may have to depress the locking tabs when inserting). When the
server has been pushed completely into the rack, you should hear the locking
tabs "click" into position.
4. (Optional) Insert and tighten the thumbscrews that hold the front of the server
to the rack.
Warning! To prevent bodily injury when mounting or servicing this unit in a
rack, you must take special precautions to ensure that the system remains
stable. The following guidelines are provided to ensure your safety:
•This unit should be mounted at the bottom of the rack if it is the only unit in
the rack.
•When mounting this unit in a partially lled rack, load the rack from the bottom
to the top with the heaviest component at the bottom of the rack.
•If the rack is provided with stabilizing devices, install the stabilizers before
mounting or servicing the unit in the rack.