Supero SUPERSERVER 1027GR-TRFT User manual

Relion 1800GT
Technical Guide
Rev. 1.0
PENGUIN
COMPUTING
www.penguincomputing.com | 1-888-PENGUIN (736-4846) | twitter:@PenguinHPC
Versatile Enterprise and HPC Server featuring the latest Intel Technology

SUPER
SUPERSERVER
1027GR-TRF
1027GR-TRFT
®
USER’S MANUAL
Revision 1.0a

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.
Super Micro Computer, Inc. ("Supermicro") reserves the right to make changes to the product
described in this manual at any time and without notice. This product, including software and docu-
mentation, is the property of Supermicro and/or its licensors, and is supplied only under a license.
Any use or reproduction of this product is not allowed, except as expressly permitted by the terms
of said license.
IN NO EVENT WILL SUPERMICRO BE LIABLE FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL,
SPECULATIVE OR CONSEQUENTIAL DAMAGES ARISING FROM THE USE OR INABILITY TO
USE THIS PRODUCT OR DOCUMENTATION, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES. IN PARTICULAR, SUPERMICRO SHALL NOT HAVE LIABILITY FOR ANY
HARDWARE, SOFTWARE, OR DATA STORED OR USED WITH THE PRODUCT, INCLUDING THE
COSTS OF REPAIRING, REPLACING, INTEGRATING, INSTALLING OR RECOVERING SUCH
HARDWARE, SOFTWARE, OR DATA.
Any disputes arising between manufacturer and customer shall be governed by the laws of Santa
Clara County in the State of California, USA. The State of California, County of Santa Clara shall
be the exclusive venue for the resolution of any such disputes. Super Micro's total liability for all
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 harmful
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: August 17, 2012
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
holders.
Copyright © 2012 by Super Micro Computer, Inc.
All rights reserved.
Printed in the United States of America

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 SuperServer 1027GR-
TRF/1027GR-TRFT. Installation and maintenance should be performed by experi-
enced technicians only.
The 1027GR-TRF/1027GR-TRFT is based on the SC118GQ-R1800B 1U rackmount
server chassis and the Super X9DRG-HF/X9DRG-HTF serverboard. Please refer
to our web site for an up-to-date list of supported operating systems, processors
and memory. See Chapter 1 for a list of differences between the server models.
Manual Organization
Chapter 1: Introduction
The first chapter provides a checklist of the main components included with the
server system and describes the main features of the Super X9DRG-HF/X9DRG-
HTF serverboard and the SC118GQ-R1800B chassis.
Chapter 2: Server Installation
This chapter describes the steps necessary to install the system into a rack and
check out the server configuration prior to powering up the system. If your server
was ordered without the processor and memory components, this chapter will refer
you to the appropriate sections of the manual for their installation.
Chapter 3: System Interface
Refer to this chapter for details on the system interface, which includes the functions
and information provided by the control panel on the chassis as well as other LEDs
located throughout the system.
Chapter 4: System Safety
You should thoroughly familiarize yourself with this chapter for a general overview
of safety precautions that should be followed when installing and servicing the
system.
iii
Preface

SUPERSERVER 1027GR-TRF/1027GR-TRFT User's Manual
iv
Chapter 5: Advanced Serverboard Setup
Chapter 5 provides detailed information on the X9DRG-HF/X9DRG-HTF
serverboard, including the locations and functions of connectors, headers and jump-
ers. Refer to this chapter when adding or removing processors or main memory
and when reconfiguring the serverboard.
Chapter 6: Advanced Chassis Setup
Refer to Chapter 6 for detailed information on the SC118GQ-R1800B 1U rackmount
server chassis. You should follow the procedures given in this chapter when install-
ing, removing or reconfiguring 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 BIOS Setup Utility.
Appendix A: BIOS Error Beep Codes
Appendix B: System Specifications

v
Preface
Notes

vi
Table of Contents
Chapter 1 Introduction
1-1 Overview ......................................................................................................... 1-1
1-2 Serverboard Features ..................................................................................... 1-2
Processors ...................................................................................................... 1-2
Memory ........................................................................................................... 1-2
Serial ATA ....................................................................................................... 1-2
PCI Expansion Slots ....................................................................................... 1-2
Onboard Controllers/Ports .............................................................................. 1-2
IPMI................................................................................................................. 1-2
1-3 Server Chassis Features ................................................................................ 1-3
System Power ................................................................................................. 1-3
SATA Subsystem............................................................................................. 1-3
Front Control Panel......................................................................................... 1-3
Cooling System ............................................................................................... 1-3
1-4 GPU Subsystem.............................................................................................. 1-4
1-5 Contacting Supermicro.................................................................................... 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
Rack Precautions ............................................................................................ 2-2
Server Precautions.......................................................................................... 2-2
Rack Mounting Considerations ....................................................................... 2-3
Ambient Operating Temperature ................................................................ 2-3
Reduced Airflow ......................................................................................... 2-3
Mechanical Loading ................................................................................... 2-3
Circuit Overloading..................................................................................... 2-3
Reliable Ground ......................................................................................... 2-3
2-4 Installing the System into a Rack ................................................................... 2-4
Identifying the Sections of the Rack Rails...................................................... 2-4
Installing the Inner Rail Extensions ................................................................ 2-5
Assembling the Outer Rails ............................................................................ 2-6
Installing the Outer Rails onto the Rack......................................................... 2-7
Installing and Removing the Chassis From a Rack ....................................... 2-8
Installing the Server into a Telco Rack ........................................................... 2-9
SUPERSERVER 1027GR-TRF/1027GR-TRFT User's Manual

vii
Table of Contents
Chapter 3 System Interface
3-1 Overview ......................................................................................................... 3-1
3-2 Control Panel Buttons ..................................................................................... 3-1
Reset............................................................................................................... 3-1
Power .............................................................................................................. 3-1
3-3 Control Panel LEDs ........................................................................................ 3-2
Overheat/Fan Fail/UID LED ............................................................................ 3-2
NIC2 ................................................................................................................ 3-2
NIC1 ................................................................................................................ 3-2
HDD................................................................................................................. 3-3
Power .............................................................................................................. 3-3
3-4 Drive Carrier LEDs.......................................................................................... 3-3
Chapter 4 System Safety
4-1 Electrical Safety Precautions .......................................................................... 4-1
4-2 General Safety Precautions ............................................................................ 4-2
4-3 ESD Precautions............................................................................................. 4-3
4-4 Operating Precautions .................................................................................... 4-4
Chapter 5 Advanced Serverboard Setup
5-1 Handling the Serverboard ............................................................................... 5-1
Precautions ..................................................................................................... 5-1
Unpacking ....................................................................................................... 5-2
5-2 Serverboard Installation .................................................................................. 5-2
5-3 Connecting Cables.......................................................................................... 5-3
Connecting Data Cables ................................................................................. 5-3
Connecting Power Cables .............................................................................. 5-3
Connecting the Control Panel......................................................................... 5-3
5-4 I/O Ports .......................................................................................................... 5-4
5-5 Installing the Processor and Heatsink ............................................................ 5-5
Installing an LGA 2011 Processor................................................................... 5-5
Installing a CPU Heatsink ............................................................................... 5-8
Memory Support.............................................................................................. 5-9
Processor/DIMM Population Configurations ............................................ 5-10
5-6 Expansion Cards............................................................................................5-11
5-7 Serverboard Details ...................................................................................... 5-12
X9DRG-HF/X9DRG-HTF Quick Reference .................................................. 5-13
5-8 Connector Definitions ................................................................................... 5-15
5-9 Jumper Settings ............................................................................................ 5-21
5-10 Onboard Indicators........................................................................................ 5-23

viii
5-11 SATA Ports .................................................................................................... 5-24
5-12 Installing Software......................................................................................... 5-25
Supero Doctor III........................................................................................... 5-26
Chapter 6 Advanced Chassis Setup
6-1 Static-Sensitive Devices.................................................................................. 6-1
Precautions ..................................................................................................... 6-1
6-2 Control Panel .................................................................................................. 6-2
6-3 System Cooling ............................................................................................... 6-2
System Fan Failure......................................................................................... 6-3
Installing the Air Shroud.................................................................................. 6-4
Installing Graphics (GPU) Cards..................................................................... 6-5
6-4 Drive Bay Installation/Removal ....................................................................... 6-7
Accessing the Drive Bays ............................................................................... 6-7
Hard Drive Installation..................................................................................... 6-7
6-5 Power Supply .................................................................................................. 6-8
Chapter 7 BIOS
7-1 Introduction...................................................................................................... 7-1
Starting BIOS Setup Utility.............................................................................. 7-1
How To Change the Configuration Data ......................................................... 7-2
Starting the Setup Utility ................................................................................. 7-2
7-2 Main Setup ...................................................................................................... 7-2
7-3 Advanced Setup Configurations...................................................................... 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 POST Error Codes
Appendix B System Specifications
SUPERSERVER 1027GR-TRF/1027GR-TRFT User's Manual

Chapter 1
Introduction
1-1 Overview
The SuperServer 1027GR-TRF/1027GR-TRFT series is a GPU-optimized server
comprised of two main subsystems: the SC118GQ-R1800B 1U server chassis and
the X9DRG-HF/X9DRG-HTF serverboard. Please refer to our web site for informa-
tion on operating systems that have been certified for use with the system (www.
supermicro.com).
• Two 4-cm counter-rotating fans (FAN-0117L4)
• Eight 4-cm counter-rotating fans (FAN-0102L4)
• One air shroud (MCP-310-11802-0N)
• One 1U NVIDIA® Kepler™ side bracket (MCP-240-00117-0N)
• Two passive CPU heatsinks (one each of SNK-P0047PS and SNK-P0047PSC)
• Riser Cards
One RSC-R1UG-E16A-X9 for PCI-Express 3.0 x16 card. left front side
One RSC-R1UG-E16B-X9 for PCI-Express 3.0 x16 card, left rear side
One RSC-R1UG-E16AR-X9 for PCI-Express 3.0 x16 card, right front side
One RSC-R1UG-E16R-X9 for PCI-Express 3.0 x8 low-profile card, above
serverboard
• Three power cables for GPU cards (CBL-0333L)
• SATA Accessories
One SAS backplane (BPN-SAS-118G-4)
Four hot-swap drive carriers (MCP-220-00047-0B)
Four SATA cables (CBL-0207L, CBL-0227L, 2 pcs. of CBL-0228L)
One SGPIO cable (CBL-0157L)
• One rail set (MCP-290-00054-0N)
• One Super Server 1027GR-TRF/1027GR-TRFT User's Manual
Chapter 1: Introduction
1-1

1-2
SUPERSERVER 1027GR-TRF/1027GR-TRFT User's Manual
1-2 Serverboard Features
At the heart of the SuperServer 1027GR-TRF/1027GR-TRFT server is the X9DRG-
HF/X9DRG-HTF, a dual processor serverboard based on the Intel C602 chipset.
Below are the main features of the X9DRG-HF/X9DRG-HTF. (See Figure 1-1 for a
block diagram of the chipset).
Processors
The X9DRG-HF/X9DRG-HTF supports two Intel Xeon E5-2600 series processors in
LGA 2011 sockets (Socket R). Please refer to the serverboard description pages on
our web site for a complete listing of supported processors (www.supermicro.com).
Memory
The X9DRG-HF/X9DRG-HTF has eight DIMM slots that can support up to 256 GB
of registered ECC DDR3-1600/1333/1066/800 MHz RDIMMs. Modules of the same
size and speed are recommended. See Chapter 5 for details.
Serial ATA
A SATA controller is integrated into the chipset to provide a 4-port SATA subsystem,
which is RAID 0, 1, 5 and 10 supported. Two of these are SATA 3.0 ports and two
are SATA 2.0 ports. The SATA drives are hot-swappable units.
Note: The operating system you use must have RAID support to enable the hot-
swap capability and RAID function of the SATA drives.
PCI Expansion Slots
The X9DRG-HF/X9DRG-HTF has three PCI-Express 3.0 x16 slots to support
three double-width GPU cards. Additional slots support one PCI-Express 3.0 x8
low-profile card.
Onboard Controllers/Ports
The color-coded I/O ports include one COM port (an additional COM header is lo-
cated on the serverboard), a VGA (monitor) port, two USB 2.0 ports, two Gb Ethernet
LAN ports (two 10 Gb ports on the X9DRG-HTF) and one dedicated IPMI LAN port.
IPMI
IPMI (Intelligent Platform Management Interface) is a hardware-level interface speci-
fication that provides remote access, monitoring and administration for Supermicro

1-3
Chapter 1: Introduction
server platforms. IPMI allows server administrators to view a server’s hardware
status remotely, receive an alarm automatically if a failure occurs, and power cycle
a system that is non-responsive.
1-3 Server Chassis Features
System Power
The SC118GQ-R1800B features a high-efficiency, redundant 1800W power supply
composed of two separate power modules. This power redundancy feature allows
you to replace a failed power supply without shutting down the system. See Chapter
6 for details.
SATA Subsystem
The SC118GQ-R1800B chassis includes four 2.5" drive bays, which may be used
to house hot-swappable SATA drives. RAID 0, 1, 5 and 10 are supported.
Front Control Panel
The control panel provides a system monitoring and control interface. LEDs indicate
system power, HDD activity, network activity, and a system overheat/fan fail/ UID
LED. A main power button and a system reset button are also included.
Cooling System
The SC118GQ-R1800B has an innovative cooling design that includes ten 4-cm
counter-rotating PWM (Pulse Width Modulated) fans. The power supply modules
also include a cooling fan. All chassis and power supply fans operate continuously.
An air shrouds is included to further help cool the GPUs. See note on the following
page regarding fan control.

1-4
SUPERSERVER 1027GR-TRF/1027GR-TRFT User's Manual
1-4 GPU Subsystem
The 1027GR-TRF/1027GR-TRFT server represents one of Supermicro's massively
parallel processing multiple-GPU servers, with support for up to three NVIDIA®
Fermi™ or Kepler™ GPUs, which place this system at the forefront of today's GPU
computing solutions.
Please refer to the NVIDIA web site (www.nvidia.com) for details on Fermi GPUs.
Notes
The GPUs can be bundled with the system as follows:
1027GR-TRF/1027GR-TRFT-FM309: includes three NVIDIA Fermi M2090 GPUs.
1027GR-TRF/1027GR-TRFT-FM375: includes three NVIDIA Fermi M2075 GPUs
NVIDIA® Kepler™ GPUs (requires their own mounting brackets for installation: p/n
MCP-240-00117-0N)

1-5
Chapter 1: Introduction
I350/X540
LAN
PCI-E X8
I-SATA
I-SATA
3.0 Gb/S
3.0 Gb/S
SATA2
6.0 Gb/S
SATA3
S-SATA2
Ports #0~3
800/1066/1333/1600 800/1066/1333/1600
DDR3
DDR3
P1
P1
P0
P0
#1-4
#1-3
#1-2
#1-1
#0-4
#0-3
#0-2
#0-1
QPI
8G
LANE6
SLOT 1
SLOT 5
SLOT 6
E5-2600 Series
CPU1 CPU2
PCH
C602
PCI-E X16 G3
DMI2
LANE5
LANE1/2/3/4
SPI
VGA Port
Dedicated LAN
DMI2
BMC
WPCM450
PCI-E X16
PCI-E X16 G3
PCI
USB 2.0
SATA2/
SAS1
E5-2600 Series
8 SNB CORE
DDR3 8 SNB CORE DDR3
DMI2
DMI2
#2 #3 #1 #1 #2 #3
QPI
8G
4GB/s
PCI-E X16
VGA
PCI-E X8 G3
PCI-E X16
PCI-E X16
SAS/SATA
Ports #0~5
SATA
#6~#9
#2~#5
#0~#1
PCI-E X8 G3
PCI-E X16 G3
PCI-E X16 G3
COM Port
Internal
Header
PCI-E X4 Gen2
PCI-E X4
PCI
SLOT 2
SLOT 3
SLOT 4
#0~#1
2 in Rear
Panel
USB
Figure 1-1. Intel C602 Chipset:
System Block Diagram
Note: This is a general block diagram. Please see Chapter 5 for details.

1-6
SUPERSERVER 1027GR-TRF/1027GR-TRFT User's Manual
1-5 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)
Asia-Pacific
Address: Super Micro Computer, Inc.
4F, No. 232-1, Liancheng Rd.
Chung-Ho Dist., New Taipei City 235
Taiwan
Tel: [phone]
Fax: [phone]
Web Site: www.supermicro.com.tw
Technical Support:
Email: [email protected]
Tel: [phone], ext.132 or 139

Chapter 2: Server Installation
2-1
Chapter 2
Server Installation
2-1 Overview
This chapter provides a quick setup checklist to get your system 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 sys-
tem 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
specific components.
2-2 Unpacking the System
You should inspect the box the system was shipped in and note if it was damaged
in any way. If the server itself shows damage you should file a damage claim with
the carrier who delivered it.
Decide on a suitable location for the rack unit that will hold the server. It should
be situated in a clean, dust-free area that is well ventilated. Avoid areas where
heat, electrical noise and electromagnetic fields are generated. You will also need
it placed near a grounded power outlet. Read the Rack and Server Precautions in
the next section.
2-3 Preparing for Setup
The box the server was shipped in should include two sets of rail assemblies, 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 sufficient airflow and ease in servicing.This product is for
installation only in a Restricted Access Location (dedicated equipment rooms,
service closets and the like).

2-2
SUPERSERVER 1027GR-TRF/1027GR-TRFT User's Manual
!
!
Warnings and Precautions!
• 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.
Rack Precautions
• Ensure that the leveling jacks on the bottom of the rack are fully extended to
the floor 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.
• Rack-mounted equipment should not be used as a shelf or work space.
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 first, 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 the hot plug SATA drives and power supply modules to cool before touch-
ing them.

Chapter 2: Server Installation
2-3
• Always keep the rack's front door and all panels and components on the servers
closed when not servicing to maintain proper cooling.
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 Airflow
Equipment should be mounted into a rack so that the amount of airflow 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
SUPERSERVER 1027GR-TRF/1027GR-TRFT User's Manual
2-4 Installing the System into a Rack
This section provides information on installing the SC118GQ chassis into a rack
unit with the rails provided. There are a variety of rack units on the market, which
may mean that the assembly procedure will differ slightly. You should also refer to
the installation instructions that came with the rack unit you are using.
Note: This rail will fit a rack between 26" and 33.5" deep.
Identifying the Sections of the Rack Rails
The chassis package includes two rack rail assemblies in the rack mounting kit.
Each assembly consists of two sections: an inner fixed chassis rail that secures
directly to the server chassis and an outer fixed rack rail that secures directly to
the rack itself.
Figure 2-1. Identifying the Sections of the Rack Rails
Inner Rail
Extension:
attach to the
chassis
Outer Rails:
slide together, then
attach to the front
and rear brackets
Inner Rail (preattached
to the chassis)
Front and Rear
Brackets: attach to
the rack

Chapter 2: Server Installation
2-5
Figure 2-2. Installing the Inner Rails
1
1
1
21
3
Installing the Inner Rail Extensions
The SC118GQ chassis includes a set of inner rack rails in two sections: inner rails
(A) and inner rail extensions (B). The inner rails are preattached and do not interfere
with normal use of the chassis if you decide not to install to a server rack. Attaching
the inner rail extensions to to the inner rails stabilizes the chassis within the rack.
Installing the Inner Rail Extensions
1. Place the inner rail extensions (B) over the preattached inner rails (A) which
are attached to the side of the chassis. Align the hooks of the inner rail with
the rail extension holes. Make sure the extension faces "outward" just like the
inner rail.
2. Slide the extension toward the front of the chassis.
3. Secure the chassis with screws as illustrated.
4. Repeat steps 1-3 for the other inner rail extension.