Supero SuperServer 5015M-MT User manual

SUPER
SUPERSERVER 5015M-MT
SUPERSERVER 5015M-MT+
USER’S MANUAL
Revision 1.0b
®

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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 © 2007 by SUPER MICRO COMPUTER INC.
All rights reserved.
Printed in the United States of America
Manual Revision 1.0b
Release Date: June 22, 2007
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 reserves the right to make changes to the product described in this
manual at any time and without notice. This product, including software, if any, and documenta-
tion may not, in whole or in part, be copied, photocopied, reproduced, translated or reduced to any
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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, SUPER MICRO SHALL NOT HAVE
LIABILITY FOR ANY HARDWARE, SOFTWARE, OR DATA STORED OR USED WITH THE
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OR RECOVERING SUCH HARDWARE, SOFTWARE, OR DATA.
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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
environment. 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.
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
reproductive harm.

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 5015M-MT/
5015M-MT+. Installation and maintainance should be performed by experienced
technicians only.
The SuperServer 5015M-MT/5015M-MT+ is a high-end single processor mini 1U
rackmount server based on the SC813MFT-300C 1U rackmount server chassis and
the Super PDSMi/PDSMi+ motherboard. The PDSMi/PDSMi+ supports a single
Intel®processor - please refer to our website for an up-to-date list of supported
processors.
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 PDSMi/PDSMi+ moth-
erboard and the SC813MFT-300C chassis.
Chapter 2: Server Installation
This chapter describes the steps necessary to install the SuperServer 5015M-
MT/5015M-MT+ into a rack and check out the server configuration prior to power-
ing 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.
iii
Preface

SUPERSERVER 5015M-MT/5015M-MT+ User's Manual
iv
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
SuperServer 5015M-MT/5015M-MT+.
Chapter 5: Advanced Motherboard Setup
Chapter 5 provides detailed information on the PDSMi/PDSMi+ motherboard,
including the locations and functions of connectors, headers and jumpers. Refer
to this chapter when adding or removing processors or main memory and when
reconfiguring the motherboard.
Chapter 6: Advanced Chassis Setup
Refer to Chapter 6 for detailed information on the SC813MFT-300C 1U rackmount
server chassis. You should follow the procedures given in this chapter when install-
ing, removing or reconfiguring Serial ATA 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: LED Indicators
Appendix B: BIOS POST Codes
Appendix C: Installing Software and Drivers
Appendix D: System Specifications

v
Preface
Notes

vi
Table of Contents
Preface
About This Manual ...................................................................................................... iii
Manual Organization ................................................................................................... iii
Chapter 1: Introduction
1-1 Overview ......................................................................................................... 1-1
1-2 Motherboard Features .................................................................................... 1-2
1-3 Server Chassis Features ................................................................................ 1-5
1-4 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 .................................................................... 2-2
Rack Precautions .................................................................................... 2-2
Server Precautions ................................................................................. 2-2
Rack Mounting Considerations ............................................................... 2-3
2-4 Installing the System into a Rack ................................................................... 2-4
Identifying the Sections of the Rack Rails ............................................... 2-4
Installing the Rear Inner Rails................................................................... 2-4
Installing the Rack Rails............................................................................ 2-5
Installing the Server into the Rack............................................................ 2-6
Installing the Server into a Telco Rack ..................................................... 2-7
2-5 Checking the Motherboard Setup .................................................................. 2-8
2-6 Checking the Drive Bay Setup ..................................................................... 2-10
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 .................................................................................. 3-2
NIC2 ........................................................................................................ 3-2
NIC1 ........................................................................................................ 3-2
HDD ........................................................................................................ 3-2
SUPERSERVER 5015M-MT/5015M-MT+ User's Manual

Power ...................................................................................................... 3-3
3-4 Serial ATA Drive Carrier LED ......................................................................... 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 Motherboard Setup
5-1 Handling the Motherboard ............................................................................... 5-1
5-2 Motherboard 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
5-6 Installing Memory............................................................................................. 5-8
5-7 Adding PCI Add-On Cards .............................................................................. 5-9
5-8 Motherboard Details ...................................................................................... 5-10
PDSMi/PDSMi+ Layout ........................................................................... 5-10
PDSMi/PDSMi+ Quick Reference ........................................................... 5-11
5-9 Connector Definitions .................................................................................... 5-12
Main ATX Power Supply Connector ....................................................... 5-12
Processor Power Connector ................................................................. 5-12
PW_ON Connector.................................................................................. 5-12
Reset Connector ................................................................................... 5-12
Overheat LED ........................................................................................ 5-13
NIC2 LED ................................................................................................ 5-13
NIC1 LED ............................................................................................... 5-13
IDE/SATA LED......................................................................................... 5-13
Power On LED ....................................................................................... 5-14
NMI Button ............................................................................................. 5-14
Fan Headers............................................................................................ 5-14
ATX PS/2 Keyboard and PS/2 Mouse Ports........................................... 5-14
Chassis Intrusion..................................................................................... 5-15
Wake-On-LAN ........................................................................................ 5-15
Wake-On-Ring ........................................................................................ 5-15
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Table of Contents

viii
JLAN1/2 (Ethernet Ports) ........................................................................ 5-15
Serial Ports ............................................................................................. 5-16
Power LED ............................................................................................. 5-16
Universal Serial Bus................................................................................ 5-16
5-10 Jumper Settings............................................................................................. 5-17
Explanation of Jumpers........................................................................... 5-17
CMOS Clear ............................................................................................ 5-17
Speaker Connector ................................................................................ 5-17
JLAN1 Enable/Disable ........................................................................... 5-18
JLAN2 Enable/Disable ........................................................................... 5-18
I2C Bus to PCI ........................................................................................ 5-18
System Power Force On......................................................................... 5-18
VGA Enable/Disable ............................................................................... 5-19
Watch Dog Enable/Disable ..................................................................... 5-19
Compact Flash Master/Slave ................................................................. 5-19
5-11 Onboard Indicators ........................................................................................ 5-20
LAN LEDs................................................................................................ 5-20
+5V Standby Power Indicator ................................................................ 5-20
BIOS POST Code Indicators ................................................................. 5-20
5-12 Parallel Port and Peripheral Drive Connections............................................ 5-21
Parallel Port............................................................................................. 5-21
IPMI Socket ............................................................................................ 5-21
Floppy Connector .................................................................................... 5-22
SATA Connectors ................................................................................... 5-22
IDE Connector......................................................................................... 5-23
Chapter 6: Advanced Chassis Setup
6-1 Static-Sensitive Devices .................................................................................. 6-1
6-2 Control Panel ................................................................................................... 6-2
6-3 System Fans.................................................................................................... 6-3
System Fan Failure ................................................................................... 6-3
6-4 Drive Bay Installation/Removal........................................................................ 6-3
Removing the Front Bezel ........................................................................ 6-3
Accessing the Drive Bays ......................................................................... 6-4
Serial ATA Drive Installation ...................................................................... 6-4
CD-ROM Drive Installation........................................................................ 6-6
6-5 Power Supply................................................................................................... 6-7
Power Supply Failure ................................................................................ 6-7
Replacing the Power Supply..................................................................... 6-7
SUPERSERVER 5015M-MT/5015M-MT+ User's Manual

Table of Contents
ix
Chapter 7: BIOS
7-1 Introduction ...................................................................................................... 7-1
7-2 Running Setup ................................................................................................. 7-2
7-3 Main BIOS Setup ............................................................................................ 7-2
7-4 Advanced Setup ............................................................................................. 7-7
7-5 Security .......................................................................................................... 7-19
7-6 Boot .............................................................................................................. 7-20
7-7 Exit ................................................................................................................ 7-21
Appendices:
Appendix A: LED Indicators ...................................................................................... A-1
Appendix B: BIOS POST Codes............................................................................... B-1
Appendix C: Software Installation ............................................................................ C-1
Appendix D: System Specifications ......................................................................... D-1

x
Notes
SUPERSERVER 5015M-MT/5015M-MT+ User's Manual

Chapter 1
Introduction
1-1 Overview
The Supermicro SuperServer 5015M-MT/5015M-MT+ is a single processor, mini
1U rackmount server. The 5015M-MT/5015M-MT+ is comprised of two main sub-
systems: the SC813MFT-300C chassis and the PDSMi/PDSMi+ motherboard. The
PDSMi/PDSMi+ supports a single Intel®processor in an LGA775 type socket and
up to 8 GB of DDR2-667/533/400 SDRAM memory. Please refer to our web site
for details on supported processors and information on operating systems that have
been certified for use with the 5015M-MT/5015M-MT+ (www.supermicro.com).
In addition to the motherboard and chassis, various hardware components may
have been included with the 5015M-MT/5015M-MT+, as listed below.
 One passive CPU heatsink (SNK-P0016)
 One (1) slim CD-ROM drive [CDM-TEAC-24(B)]
 One (1) SATA backplane (CSE-SATA-813)
 Four (4) SATA drive carriers [CSE-PT39(B)]
 One (1) USB/COM tray cable [CSE-PT40(B)]
 One (1) air shroud (CSE-PT0118)
 One (1) 64-bit PCI-X slot riser card (CSE-RR1U-Xi)
 Rackmount hardware with screws (CSE-PT52) (optional):
Two (2) rack rail assemblies
Six (6) brackets for mounting the rack rails in a rack/telco rack
 One (1) CD containing drivers and utilities
 SuperServer 5015M-MT/5015M-MT+ User's Manual
Chapter 1: Introduction
1-1

1-2
SUPERSERVER 5015M-MT/5015M-MT+ User's Manual
1-2 Motherboard Features
At the heart of the SuperServer 5015M-MT/5015M-MT+ lies the PDSMi/PDSMi+, a
single processor motherboard designed to provide maximum performance. Below
are the main features of the PDSMi/PDSMi+.
Chipset Overview
The PDSMi is based on Intel’s E7230 chipset and the PDSMi+ is based on Intel's
E3000 chipset. See Figure 1-1 and 1-2 for chipset block diagrams.
Processors
The PDSMi/PDSMi+ has an LGA775 ZIF socket that supports a single Intel proces-
sor. Please refer to the support section of our web site for a complete listing of
supported processors (http://www.supermicro.com/support).
Memory
The PDSMi/PDSMi+ has four (4) 240-pin DIMM sockets that can support up to 8 GB
of unbuffered ECC or non-ECC DDR2-667/533/400 SDRAM modules. (Memory op-
erates in a dual-channel, or interleaved configuration for increased performance.)
Serial ATA
A SATA controller is incorporated into the ICH7R portion of the chipset to provide a
four-port Serial ATA subsystem. The Serial ATA drives are hot-swappable units.
PCI Expansion Slots
The PDSMi/PDSMi+ has one universal PCI-X 133 MHz slot, one PCI-Express x8
slot and one 32-bit, 33 MHz (5V) PCI slot. When incorporated into the 5015M-
MT/5015M-MT+ server system, a riser card is included for use with the PCI-X slot
to support one full-size, half-length expansion card. An optional riser card (CSE-
RR1U-Ei) can be used to support an 8x PCI-Express card.
Ethernet Ports
Two Intel 82573V PCI-Express gigabit Ethernet controllers are incorporated into the
PDSMi/PDSMi+ to support two Gigabit LAN ports.

Chapter 1: Introduction
1-3
E7230
RAGE XL
LGA775_PROCESSOR
ICH-7R
USB
PORT_0~7
FWH
LPC I/O
MS.
KB.
FDD. SER.1
SER.2
PRN.
PRI_IDE
VRM 10.1
ADDR CTRL CTRL
ADDR DATADATA
UDMA/100
LPC
PCI_32_BUS
DDR2_667/533
VRM V10.1
DMI
ATI
DIMM_CHA
S-ATA/300
4 x SATA
CK410 CLK
MCH
DIMM_CHB
PORTS
PCIE_x8
2XGb_LAN
1_PCIE_x1
PCIE_x1
W83627EHF
FSB: 1066/800/533MHz
LPCUSB 2.0/1.1
PCIE_x4
PXH
2x PCIX_100
PCI-X BUS
SCSI-7901
PCI-X BUS
PCI-X BUS
2x PCIX 133
SUPER SLOT
IPMI I/F
PCI 32 BUS
1_PCIE_x4
(MUKILTEO)
Onboard Controllers/Ports
An onboard IDE controller supports one floppy drive and up to two UltraDMA/ATA
100 hard drives or ATAPI devices. Onboard I/O backpanel ports include one serial
COM port, a VGA (video) port, two USB ports, PS/2 mouse and keyboard ports
and two GLAN (RJ45) ports.
Other Features
Other onboard features that promote system health include voltage monitors, a
chassis intrusion header, auto-switching voltage regulators, chassis and CPU
overheat sensors, virus protection and BIOS rescue.
Figure 1-1 . Intel E7230 Chipset (PDSMi):
System Block Diagram
Note: This is a general block diagram. Please see Chapter 5 for details.

1-4
SUPERSERVER 5015M-MT/5015M-MT+ User's Manual
Intel 3000
ES1000
LGA775_PROCESSOR
ICH-7R
USB
PORT_0~5
FWH
LPC I/O
MS.
KB. FDD. SER.1
SER.2
PRN.
PRI_IDE
VRM 11.0
ADDR CTRL CTRL
ADDR DATADATA
UDMA/100
PCI_32_BUS
DDR2_667/533/400
VRM V10.1
DMI
ATI
S-ATA/300
4 x SATA
CK410 CLK
MCH
PORTS
2XGb_LAN
PCIE_x1
W83627HG
FSB: 1066/800/533MHz
USB 2.0/1.1
PCIE_x4
PCI-X BUS
SMBUS I/F
PXH_V
PCIE_x8
CF_HEADER
W83793
H/W
MONITOR
PCI_32_BUS
LPC
CH_B1-2
DDR2
CH_A1-2
1x PCIE_x8
1x PCIX_64
SLOT
SLOT
1x PCI_32
3.3V SLOT
Figure 1-1 . Intel E3000 Chipset (PDSMi+):
System Block Diagram
Note: This is a general block diagram. Please see Chapter 5 for details.

Chapter 1: Introduction
1-5
1-3 Server Chassis Features
The following is a general outline of the main features of the SC813MFT-300C
chassis.
System Power
When configured as a SuperServer 5015M-MT/5015M-MT+, the SC813MFT-300C
chassis includes a single 300W power supply.
Control Panel
The SC813MFT-300C's control panel provides important system monitoring and
control information. LEDs indicate power on, network activity, hard disk drive activ-
ity, overheat warning and fan failure. The control panel also includes a main power
button and a system reset button.
Rear I/O Panel
The rear I/O panel on the SC813MFT-300C provides one motherboard expansion
slot, one COM port (another is internal), two USB ports, PS/2 mouse and keyboard
ports, a VGA (graphics) port and two Gb Ethernet ports. (See Chapter 6 for dia-
gram.)
Cooling System
The SC813MFT-300C chassis has an innovative cooling design that features an
air shroud and three sets of fans. The 5015M-MT includes three sets of 40-mm
counter-rotating fans and the 5015M-MT+ includes three sets of normal (non-
counter-rotating) 40-mm fans. Fan speed can be defined with a fan speed control
setting in BIOS (see Chapter 7).

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SUPERSERVER 5015M-MT/5015M-MT+ User's Manual
1-4 Contacting Super Micro
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, Taiwan
4F, No. 232-1, Liancheng Rd.
Chung-Ho 235, Taipei, Taiwan, R.O.C.
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 SuperServer 5015M-MT/
5015M-MT+ up and running. Following the steps in the order given should enable
you to have the system operational within a minimal amount of time. This quick
setup assumes that your 5015M-MT/5015M-MT+ system has come to you with the
processor and memory preinstalled. If your system is not already fully integrated
with a motherboard, processor, 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 SuperServer 5015M-MT/5015M-MT+ 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 SuperServer
5015M-MT/5015M-MT+ . 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 SuperServer 5015M-MT/5015M-MT+ was shipped in should include
two sets of rail assemblies, six 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 minimal amount of time. Please read this
section in its entirety before you begin the installation procedure outlined in the
sections that follow.

2-2
SUPERSERVER 5015M-MT/5015M-MT+ User's Manual
Choosing a Setup Location
- Leave enough clearance in front of the rack to enable you to open the front door
completely (~25 inches).
- Leave 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).
- This product is not suitable for use with visual display work place devices according
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 a 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 simul-
taneously 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 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 power supply units and hot plug SATA drives 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.
!!
Warnings and Precautions!

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 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 5015M-MT/5015M-MT+ User's Manual
2-4 Installing the System into a Rack
This section provides information on installing the SuperServer 5015M-MT/5015M-
MT+ into a rack unit with the rack rails provided. If the server has already been
mounted into a rack, you can skip ahead to Sections 2-5 and 2-6. 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.
Identifying the Sections of the Rack Rails
You may have received rack rail hardware with the SuperServer 5015M-MT/5015M-
MT+. (Two front inner rails should already be attached to the chassis.) This
hardware consists of two rear inner rails that secure to the chassis, one on each
side just behind the preinstalled front inner rails. Note that these two rails are
left/right specific.
Installing the Rear Inner Rails
First, locate the right rear inner rail (the rail that will be used on the right side of
the chassis when you face the front of the chassis). Align the two square holes
on the rail against the hooks on the right side of the chassis. Securely attach the
rail to the chassis with M4 flat head screws. Repeat these steps to install the left
rear inner rail to the left side of the chassis (see Figure 2-1). You will also need to
attach the rail brackets when installing into a telco rack.
Locking Tabs: Both chassis rails have a locking tab, which serves two functions.
The first is to lock the server into place when installed and pushed fully into the
rack, which is its normal position. Secondly, these tabs also lock the server in place
when fully extended from the rack. This prevents the server from coming completely
out of the rack when you pull it out for servicing.