Supero SUPERSERVER 5016I-M6F User manual

SUPER
SUPERSERVER 5016I-M6F
USER’S MANUAL
Revision 1.0
®

Manual Revision 1.0
Release Date: November 12, 2009
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, if any,
and documentation may not, in whole or in part, be copied, photocopied, reproduced, translated or
reduced to any medium or machine without prior written consent.
IN NO EVENT WILLSUPERMICRO 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 DATASTORED OR USED WITH THE PRODUCT, INCLUDINGTHE
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
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.
California Best Management Practices Regulations for Perchlorate Materials: This Perchlorate
warning 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
reproductive harm.
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 © 2009 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 5016I-M6F. In-
stallation and maintenance should be performed by experienced technicians only.
The SuperServer 5016I-M6F is a 1U rackmount server based on the SC813MTS-
350CB server chassis and the Super X8SI6-F serverboard. Please refer to our web
site for updates on 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 X8SI6-F serverboard
and the SC813MTS-350CB chassis.
Chapter 2: Server Installation
This chapter describes the steps necessary to install the SuperServer 5016I-M6F
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 chap-
ter 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 5016I-M6F 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 5016I-M6F.
Chapter 5: Advanced Serverboard Setup
Chapter 5 provides detailed information on the X8SI6-F serverboard, 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
serverboard.
Chapter 6: Advanced Chassis Setup
Refer to Chapter 6 for detailed information on the SC813MTS-350CB chassis.
You should follow the procedures given in this chapter when installing, 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: BIOS POST Error Codes
Appendix B: Installing Windows
Appendix C: System Specifications

v
Preface
Notes

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SUPERSERVER 5016I-M6F User's Manual
Table of Contents
Chapter 1 Introduction
1-1 Overview .........................................................................................................1-1
1-2 Motherboard Features.....................................................................................1-2
Processors ......................................................................................................1-2
Memory ...........................................................................................................1-2
SAS ................................................................................................................1-2
Serial ATA ....................................................................................................... 1-2
PCI Expansion Slots....................................................................................... 1-2
I/O Ports..........................................................................................................1-2
Other Features................................................................................................ 1-3
1-3 Server Chassis Features ................................................................................ 1-3
System Power................................................................................................. 1-3
SATA Subsystem............................................................................................. 1-3
Control Panel .................................................................................................. 1-3
Rear I/O Panel................................................................................................ 1-3
Cooling System............................................................................................... 1-4
1-4 Contacting Supermicro....................................................................................1-5
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 Rear Inner Rails ........................................................................2-4
Installing the Rack Rails .................................................................................2-5
Installing the Server into the Rack.................................................................. 2-6

vii
Table of Contents
Installing the Server into a Telco Rack........................................................... 2-7
2-5 Checking the Motherboard Setup................................................................... 2-8
2-6 Checking the Drive Bay Setup........................................................................ 2-9
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
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 Motherboard Setup
5-1 Handling the Motherboard .............................................................................. 5-1
Precautions .....................................................................................................5-1
Unpacking .......................................................................................................5-1
5-2 Motherboard Installation..................................................................................5-2
5-3 Connecting Cables..........................................................................................5-2
Connecting Data Cables.................................................................................5-2
Connecting Power Cables .............................................................................. 5-3
Connecting the Control Panel......................................................................... 5-3
5-4 I/O Ports..........................................................................................................5-4
5-5 Processor and Heatsink Installation................................................................5-4
Installing the LGA1156 Processor .................................................................5-5
Installing a Passive CPU Heatsink .................................................................5-7
5-6 Installing Memory............................................................................................ 5-9
DIMM Installation ............................................................................................ 5-9
Memory Support..............................................................................................5-9
Memory Population Guidelines..................................................................... 5-10
5-7 Adding PCI Expansion Cards ........................................................................5-11

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SUPERSERVER 5016I-M6F User's Manual
5-8 Motherboard Details...................................................................................... 5-12
5-9 Connector Definitions ...................................................................................5-15
Main ATX Power Supply Connector......................................................... 5-15
Processor Power Connector ....................................................................5-15
Power Button ........................................................................................... 5-15
Reset Button ...........................................................................................5-15
Overheat (OH)/Fan Fail/Front UID LED...................................................5-16
NIC1/NIC2 (LAN1/LAN2).......................................................................... 5-16
HDD LED.................................................................................................. 5-16
Power On LED......................................................................................... 5-16
Chassis Intrusion......................................................................................5-17
ATX PS/2 Keyboard and PS/2 Mouse Ports............................................ 5-17
Fan Headers............................................................................................. 5-17
Speaker....................................................................................................5-17
Serial Ports...............................................................................................5-18
Universal Serial Bus (USB)...................................................................... 5-18
LAN1/LAN2 (Ethernet Ports).................................................................... 5-18
Onboard Power LED................................................................................5-19
Power Supply I2C Connector....................................................................5-19
T-SGPIO 0/1 Headers.............................................................................. 5-19
Alarm Reset.............................................................................................. 5-19
Wake-On-Ring..........................................................................................5-20
Wake-On-LAN .......................................................................................... 5-20
Unit ID Switch........................................................................................... 5-20
5-10 Jumper Settings............................................................................................ 5-21
Explanation of Jumpers............................................................................5-21
CMOS Clear............................................................................................. 5-21
VGA Enable..............................................................................................5-21
LAN1/LAN2 Enable/Disable ....................................................................5-22
PCI Slot SMB Enable............................................................................... 5-22
USB Wake-Up .........................................................................................5-22
BMC Jumper ............................................................................................ 5-22
SAS Enable/Disable................................................................................. 5-23
5-11 Onboard Indicators........................................................................................5-23
LAN1/2 LEDs............................................................................................ 5-23
IPMI Dedicated LAN LEDs ..................................................................... 5-23
Onboard Power LED ............................................................................................................ 5-23
SAS Heartbeat LED & SAS Error LED.................................................... 5-24
IPMI Heartbeat LED................................................................................. 5-24

Table of Contents
ix
Rear UID LED.......................................................................................... 5-24
5-12 SAS, SATA and Floppy Drive Connections................................................... 5-25
SATA Ports ............................................................................................... 5-25
SAS Connections..................................................................................... 5-25
Floppy Connector..................................................................................... 5-25
5-13 Installing Additional Drivers........................................................................... 5-26
5-14 Configuring Supero Doctor III.......................................................................5-27
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................................................................................................... 6-3
6-4 Drive Bay Installation/Removal....................................................................... 6-3
Removing the Front Bezel..............................................................................6-3
SAS/SATA Drive Installation............................................................................ 6-4
Accessing the Drive Bays...............................................................................6-4
SAS/SATA Backplane......................................................................................6-5
6-5 Power Supply.................................................................................................. 6-7
Power Supply Failure...................................................................................... 6-7
Chapter 7 BIOS
7-1 Introduction...................................................................................................... 7-1
Starting BIOS Setup Utility..............................................................................7-1
How To Change the Configuration Data.........................................................7-1
How to Start the Setup Utility ......................................................................... 7-2
7-2 Main Setup...................................................................................................... 7-2
7-3 Advanced Setup Configurations......................................................................7-4
7-4 Security Settings........................................................................................... 7-20
7-5 Boot Settings ................................................................................................ 7-21
7-6 Exit Options...................................................................................................7-22
Appendix A POST Error Beep Codes
Appendix B Installing Windows
Appendix C System Specifications

Notes
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SUPERSERVER 5016I-M6F User's Manual

Chapter 1
Introduction
1-1 Overview
The SuperServer 5016I-M6F is a short-depth server comprised of two main sub-
systems: the SC813MTS-350C 1U chassis and the X8SI6-F motherboard. Please
refer to our web site for information on operating systems that have been certified
for use with the SuperServer 5016I-M6F (www.supermicro.com).
In addition to the motherboard and chassis, various hardware components have
been included with the SuperServer 5016I-M6F, as listed below:
Four 4-cm high-performance fans (FAN-0065L4)
•
One passive heat sink (SNK-P0046P)•
One PCI-Express 2.0 x16 riser card (CSE-RR1U-E16)•
One slim DVD-ROM drive (DVM-TEAC-DVD-SBT or DVM-PNSC-DVD-SBT)•
One USB adapter for DVD-ROM (CDM-USATA-G)•
One DVD-ROM cable (CBL-0341L)•
SAS/SATA Accessories•
One SAS/SATA backplane (CSE-SAS-815TQ)
One iPass to SATA cable set (CBL-0278L)
Four hard disk trays (CSE-PT39-B0)
One SuperServer 5016I-M6F User's Manual
•
One rackmount rail kit (CSE-PT52)•
Chapter 1: Introduction
1-1

1-2
SUPERSERVER 5016I-M6F User's Manual
1-2 Motherboard Features
At the heart of the SuperServer 5016I-M6F lies the X8SI6-F, a single processor
motherboard based on the Intel® 3420 chipset. Below are the main features of the
X8SI6-F. See Figure 1-1 for a block diagram of the chipset.
Processors
The X8SI6-F supports a single Intel®Xeon®3400 Series and L3426 processors in
an LGA1156 socket. Please refer to the motherboard description pages on our web
site for a complete listing of supported processors (www.supermicro.com).
Memory
The X8SI6-F has six DIMM slots that can support up to 16 GB of UDIMM (unbuf-
fered DIMMs) or up to 32 GB or RDIMM (registered DIMMs) DDR3-1333/1066/800
memory. Dual-channel configurations are supported. Memory modules of the same
size and speed should be used. See Chapter 5 for details.
SAS
An LSI SAS 2008 controller is included on the motherboard to provide an eight-port,
SAS subsystem, which is RAID 0, 1, 10 and (Windows only) 5 capable. The SAS
drives are hot-swappable units.
Serial ATA
A SATA controller is integrated into the chipset to provide a six-port, 3 Gb/s Serial
ATA subsystem, which is RAID 0, 1, 10 and (Windows only) 5 capable. The SATA
drives are hot-swappable units.
PCI Expansion Slots
The X8SI6-F has one PCI-Express 2.0 x8 (in a x16 slot), one PCI-Express 2.0 x4
(in a x8 slot) and one 32-bit PCI 33 MHz slot.
I/O Ports
The color-coded I/O ports include a COM port, two USB 2.0 ports, PS/2 mouse
and keyboard ports and two Gb Ethernet ports. A dedicated IPMI LAN port is also
included on the X8SI6-F.

1-3
Chapter 1: Introduction
Other Features
Other onboard features that promote system health include onboard voltage moni-
tors, a chassis intrusion header, 3-phase switching voltage regulators, chassis and
CPU overheat sensors, Thermal Monitor 2 (TM2) support and a BIOS flash upgrade
utility.
1-3 Server Chassis Features
The following is a general outline of the main features of the SC813MTS-350C
chassis.
System Power
When configured as a SuperServer 5016T-MTFB, the SC813MTS-350C chassis
includes a single 350W power supply.
SATA Subsystem
For the 5016T-MTFB, the SC813MTS-350 chassis was designed to support four
SATA hard drives, which are hot-swappable units.
Note: The operating system you use must have RAID support to enable the
hot-swap capability of the SATA drives (system-based RAID is not available for
SATA).
Control Panel
The SC813MTS-350C's control panel provides important system monitoring and
control information. LEDs indicate power on, network activity, hard disk drive activ-
ity and system overheat conditions. The control panel also includes a main power
button and a system reset button. The front of the SC813MTS-350C also includes
a COM port and two USB serial ports for easy access.
Rear I/O Panel
The SC813MTS-350C is a 1U rackmount chassis. Its I/O panel provides one PCI
motherboard expansion slot, one COM port (another is internal), two USB ports,
a parallel (printer) port, PS/2 mouse and keyboard ports, a VGA port and two Gb
Ethernet ports.

1-4
SUPERSERVER 5016I-M6F User's Manual
Figure 1-1. Intel 3420 Chipset:
System Block Diagram
Note: This is a general block diagram. Please see Chapter 5 for details.
RJ45
2 iPass
(reserved)
PCIe2.0_x8
SASII LSI2008
5.0GT/s
Intel® 3420
GLAN2
82574L
RMII
VGA
PORT
RTL8201
PHY
WINBOND WPCM450
(BMC)
PCI32
Intel®
Xeon® 3400
Series
6 RDIMM
(4 Quad rank
RDIMMs run at
800MHz)
DIMM3
DIMM3
SW
LPC
PCIe_x1
2.5Gbps
CK505
Rev1.0 CLOCK
COM1,2
P/S2
LPC
HEALTH
INFO
LPC
TPM1.2
DDR3 (CHA)
PCIe2.0_x8
VRM 11.1
VID[0-7]
LPC I/O
W83627DHG-P
PCIe x16 SLOT
RJ45
RJ45
DDR3 (CHB)
DIMM1(Far)
DIMM2
DIMM1(Far)
DIMM2
4 UDIMM
MISC VRs
1333/1066MHz
1333/1066MHz
5.0GT/s
x4 DMI
2.5Gb
PCH
2.5Gbps
PCIe_x4
PCIe x8 SLOT
PCI 32
1 PCI 32 SLOT
6 SATA PORTS
SATA-II
300MB/s
8 USB PORTS
USB2.0
480Mbps
FLASH
SPI 32Mb
SPI
PCIe_x1
2.5Gbps
GLAN1
82574L
(For IPMI
only)
Cooling System
The SC813MTS-350C chassis has an innovative cooling design that features three
4-cm high-performance system cooling fans. Each of these fans plug into a chassis
fan header on the motherboard. An air shroud channels the airflow generated by
the fans to efficiently cool the processor area of the system.
A fan speed control setting in BIOS allows fan speed to be determined by system
temperature [the recommended setting is 3-pin (Server)].

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)
Asia-Pacific
Address: Super Micro Computer, Inc.
4F, No. 232-1, Liancheng Rd.
Chung-Ho 235, Taipei County
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

1-6
SUPERSERVER 5016I-M6F User's Manual
Notes

Chapter 2: Server Installation
2-1
Chapter 2
Server Installation
2-1 Overview
This chapter provides a quick setup checklist to get your SuperServer 5016I-M6F
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 5016I-M6F system has come to you with the processor and memory prein-
stalled. 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 5016I-M6F 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 5016I-
M6F. 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 5016I-M6F 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.
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

2-2
SUPERSERVER 5016I-M6F User's Manual
!
!
Warnings and Precautions!
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.
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.
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 SAS/SATA 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 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 5016I-M6F User's Manual
2-4 Installing the System into a Rack
This section provides information on installing the SuperServer 5016I-M6F 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 5016I-M6F. (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.