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 documentation, 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, SOFTW ARE, OR DA TA 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 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.
Manual Revision 1.0
Release Date: May 7, 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.
This manual is written for professional system integrators and PC technicians. It
provides information for the installation and use of the SuperServer 5017GR-TF.
Installation and maintenance should be performed by experienced technicians only .
The 5017GR-TF is based on the SC818G-1K43B 1U rackmount server chassis and
the Super X9SRG-F motherboard. Please refer to our web site for an up-to-date list
of supported operating systems, processors and memory.
Manual Organization
Preface
Chapter 1: Introduction
The fi rst chapter provides a checklist of the main components included with the
server system and describes the main features of the Super X9SRG-F motherboard
and the SC818G-1K43B chassis.
Chapter 2: Server Installation
This chapter describes the steps necessary to install the system into a rack and
check out the server confi guration 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
SUPERSERVER 5017GR-TF User's Manual
Chapter 5: Advanced Motherboard Setup
Chapter 5 provides detailed information on the X9SRG-F 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 reconfi guring the
motherboard.
Chapter 6: Advanced Chassis Setup
Refer to Chapter 6 for detailed information on the SC818G-1K43B 1U rackmount
server chassis. You should follow the procedures given in this chapter when installing, removing or reconfi guring 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 information on running the BIOS Setup Utility.
7-8 Save & Exit ................................................................................................... 7-25
Appendix A BIOS POST Error Codes
Appendix B System Specifi cations
viii
Chapter 1:Introduction
Chapter 1
Introduction
1-1 Overview
The SuperServer 5017GR-TF series is a GPU-optimized server comprised of two
main subsystems: the SC818G-1K43B 1U server chassis and the X9SRG-F motherboard. Please refer to our web site for information on operating systems that have
been certifi ed for use with the system (www.supermicro.com).
• Four 4-cm counter-rotating fans (FAN-0117L4)
• Four 4-cm fans (FAN-0102L4)
• One air shroud (MCP-310-81801-0B)
• One passive CPU heatsink (SNK-P0047PS)
• Riser Cards
One RSC-R1UG-E16R for PCI-Express 3.0 x16 card. left front side
One RSC-R1UG-E16-X9S for PCI-Express 3.0 x16 card, right front side
One RSC-R1UG-E16R-X9S for PCI-Express 3.0 x8 low-profi le card, above
motherboard
• Two power cables for GPU cards (CBL-0333L)
• SATA Accessories
One SAS backplane (BPN-SAS-818TQ)
Three 3.5" drive carriers (MCP-220-00075-0B)
• One rail set (MCP-290-00054-0N)
• One Super Server 5017GR-TF User's Manual
1-1
SUPERSERVER 5017GR-TF User's Manual
1-2 Motherboard Features
At the heart of the SuperServer 5017GR-TF server is the X9SRG-F, a single processor motherboard based on the Intel C602 chipset. Below are the main features of
the X9SRG-F. (See Figure 1-1 for a block diagram of the chipset).
Processors
The X9SRG-F supports a single Intel Xeon E5-2600 series processors in LGA 2011
sockets (Socket R). Please refer to the motherboard description pages on our web
site for a complete listing of supported processors (www.supermicro.com).
Memory
The X9SRG-F has eight DIMM slots that can support up to 256 GB of unbuffered
ECC DDR3-1600/1333/1066/800 RDIMMs or 64 GB of DDR3, unbuffered non-ECC
UDIMMs up to 1600 MHz. 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 10-port SAT A subsystem,
which is RAID 0, 1, 5 and 10 supported. Two of these are SATA 3.0 ports and eight
are SATA 2.0 ports. The SATA drives are hot-swappable units.
Note: The operati ng system yo u use must h ave R AID su ppor t to e nable t he hotswap capability and RAI D function of the SATA drives.
PCI Expansion Slots
The X9SRG-F has two PCI-Express 3.0 x16 slots to support three double-width
GPU cards. An additional slot supports one PCI-Express 3.0 x8 low-profi le card.
I/O Ports
The color-coded I/O ports include one COM port, a VGA (monitor) port, two USB
2.0 ports, two Gb Ethernet LAN ports and one dedicated IPMI LAN port.
IPMI
IPMI (Intelligent Platform Management Interface) is a hardware-level interface specifi cation that provides remote access, monitoring and administration for Supermicro
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.
1-2
Chapter 1:Introduction
1-3 Server Chassis Features
System Power
The SC818G-1K43B features a Gold Level 1400W high-effi ciency power supply. The
AC power cord should be removed from the system before servicing or replacing
the power supply. See Chapter 6 for details.
SATA Subsystem
The SC818G-1K43B chass is include s three 3.5 " drive bays, whi ch may be used
to house ho t-swappa ble SATA dr ives. R AID 0, 1, 5 and 10 are supp orte d (RA ID
5 is not supp or ted with L inux OS).
Front Control Panel
The control panel provides a system monitoring and control interface. LEDs indicate
system power, HDD activity, network activity, system overheat, UID and power
supply failure. A main power button and a system reset button are also included.
Cooling System
The SC818G-1K43B has an innovative cooling design that includes eight 4-cm
counter-rotating PWM (Pulse Width Modulated) fans located in the middle section
of the chassis. Two additional fans are included to cool each GPU in the server.
The power supply module also includes a cooling fan. All chassis and power supply fans operate continuously. An air shroud channels the airfl ow from the system
fans to effi ciently cool the processors and memory. See note on the following page
regarding fan control.
1-4 GPU Subsystem
The 5017GR-TF server represents one of Supermicro's massively parallel processing multiple-GPU servers, with support for up to two GPUs. NVIDIA® Fermi™ GPUs
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.
Two GPUs can be bundled with the system.
Note: This is a general block diagram. Please see Chapter 5 for details.
SLOT 7
SLOT 6
SLOT 5
SLOT 3
SLOT 2
SLOT 1
SLOT 10
SLOT 9
PCIE 3.0x8
#1
#2
DDR3 DIMM
#1
#2
DDR3 DIMM
SLOT 8
SLOT 4
PCIE 3.0x8
I350AM2
JLAN1
RJ45
E
C
#1
#2
DDR3 DIMM
P00_P11
Lane Reversal
#1
#2
DDR3 DIMM
Dual GbE
JLAN2
RJ45
PCIE 2.0x8 Slot 11
H
B
#1
#2
DDR3 DIMM
#1
#2
DDR3 DIMM
PE2 PE1 DMI
PE3
F
D
CPU REAR
Socket 2
PROCESSOR
E5-2600
P0P1
P1P0
CPU FRONT
Socket 1
PROCESSOR
E5-2600
PE3
PE2 PE1 DMI
QPI
QPI
DMI: LANE
Reversal
DMI
PEG [0..3]
SSB
Intel C602
SATA Gen3 [0..3]
PCI
USB [10,11] LPC
S-SATA2
S-SATA3
S-SATA0
S-SATA1
SATA
Gen2
3GB/s
(x4)
#1
#2
G
DDR3 DIMM
#1
#2
A
DDR3 DIMM
BIOS
SPI Flash
SPI
SATA [0..5]
USB [0..9]
S-SATA0
ports 0,1
REAR
SATA Gen3
6GB/s
S-SATA3
S-SATA2
S-SATA1
2,3
REAR
SATA Gen2
3GB/s
S-SATA4
S-SATA5
port 4 port 5
TYPE A TYPE A
HDR 2X5
HDR 2X5
6,7 8,9
VGA
DDR2 RAM
VGA CONN
Windbond
1-5
BMC
PHY
RTL8201F
IPMI LAN
RJ45
TPM Header
Super I/O
W83527
HW Monitor
NCT7904D
SUPERSERVER 5017GR-TF User's Manual
Notes
1-6
Chapter 2: Server Installation
Chapter 2
Server Installation
2-1 Overview
This chapter provides a quick setup checklist to get your SuperServer up and
running. Following these steps in the order given should enable you to have the
system operational within a minimum amount of time. This quick setup assumes
that your system has come to you with the processors and memory preinstalled. If
your system is not already fully integrated with a motherboard, processors, system
memory etc., please turn to the chapter or section noted in each step for details on
installing specifi c 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 fi le 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 fi elds 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 suffi cient airfl ow and ease in servicing.This product is for
installation only in a Restricted Access Location (dedicated equipment rooms,
service closets and the like).
2-1
SUPERSERVER 5017GR-TF User's Manual
!
!
• 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.
Warnings and Precautions!
Rack Precautions
• Ensure that the leveling jacks on the bottom of the rack are fully extended to
the fl oor with the full weight of the rack resting on them.
• In single rack installation, stabilizers should be attached to the rack. In multiple
rack installations, the racks should be coupled together.
• Always make sure the rack is stable before extending a component from the
rack.
• You should extend only one component at a time - extending two or more si-
multaneously may cause the rack to become unstable.
• 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 fi rst, and then
work up.
• Use a regulating uninterruptible power supply (UPS) to protect the server from
power surges, voltage spikes and to keep your system operating in case of a
power failure.
• Allow the hot plug SATA drives and power supply modules to cool before touch-
ing them.
2-2
Chapter 2: Server Installation
• 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 temperature 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 temperature (Tmra).
Reduced Airfl ow
Equipment should be mounted into a rack so that the amount of airfl ow required
for safe operation is not compromised.
Mechanical Loading
Equipment should be mounted into a rack so that a hazardous condition does not
arise due to uneven mechanical loading.
Circuit Overloading
Consideration should be given to the connection of the equipment to the power
supply circuitry and the effect that any possible overloading of circuits might have
on overcurrent protection and power supply wiring. Appropriate consideration of
equipment nameplate ratings should be used when addressing this concern.
Reliable Ground
A reliable ground must be maintained at all times. To ensure this, the rack itself
should be grounded. Particular attention should be given to power supply connections other than the direct connections to the branch circuit (i.e. the use of power
strips, etc.).
2-3
SUPERSERVER 5017GR-TF User's Manual
2-4 Installing the System into a Rack
This section provides information on installing the SC818G 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 fi t 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 fi xed chassis rail that secures
directly to the server chassis and an outer fi xed rack rail that secures directly to
the rack itself.
Figure 2-1. Identifying the Sections of the Rack Rails
Inner Rail (preattached
to the chassis)
Inner Rail
Extension:
attach to the
chassis
Outer Rails:
slide together, then
attach to the front
and rear brackets
Front and Rear
Brackets: attach to
the rack
2-4
Chapter 2: Server Installation
Installing the Inner Rail Extensions
The SC818G 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.
Figure 2-2. Installing the Inner Rails
2-5
2
1
1
1
3
1
SUPERSERVER 5017GR-TF User's Manual
Assembling the Outer Rails
Each outer rail is in two sections that must be assembled before mounting on to
the rack.
Assembling the Outer Rails
1. Identify the left and right outer rails by examining the ends, which bend
outward.
2. Slide the front section of the outer rail (A), into the rear section of the outer
rail (B).
Figure 2-3. Assembling the Outer Rails
Secure to the
front of the rack
Slide outer rails
together
Assembling the sections of
A
1
the outer rail
B
1
Secure to the
rear of the rack
Outer rail assembled
2-6
Chapter 2: Server Installation
Installing the Outer Rails onto the Rack
Outer Rail Installation
1. Adjust the outer rails to the proper length so that the outer rail fi ts snugly
within the rack.
2. Align the holes on the front of the outer rail, with the holes on the front of the
rack (C) and secure with the screws provided.
3. Align the holes on the rear of the outer rail to the holes on the rack (D) and
secure with the screws provided.
4. Repeat the procedure with the second outer rail assembly.
Figure 2-4. Installing the Outer Rails to the Rack
C
1
D
1
2-7
SUPERSERVER 5017GR-TF User's Manual
Installing the Chassis into a Rack (Figure 2-5)
1. Confi rm that chassis includes the inner rails and rail extensions . Also, confi rm
that the outer rails are installed on the rack.
2. Line chassis rails with the front of the rack rails.
3. Slide the chassis rails into the rack rails, keeping the pressure even on both
sides (you may have to depress the locking tabs when inserting). When the
server has been pushed completely into the rack, you should hear the locking
tabs "click".
4. (Optional) Insert and tightening the thumbscrews that hold the front of the
server to the rack.
Figure 2-5. Installing the Server into a Rack
2-8
Chapter 2: Server Installation
Installing the Server into a Telco Rack
Optional brackets (p/n MCP-290-00016-0N) are needed to install the server to a
telco (open type) rack.
To install the server into a Telco type rack, use the two L-shaped brackets on either
side of the chassis (four total). First, determine how far follow the server will extend
out the front of the rack. Larger chassis should be positioned to balance the weight
between front and back. If a bezel is included on your server, remove it. Then attach the two front brackets to each side of the chassis, then the two rear brackets
positioned with just enough space to accommodate the width of the telco rack. Finish
by sliding the chassis into the rack and tightening the brackets to the rack.
Figure 2-6. Installing the Server into a Telco Rack
2-9
SUPERSERVER 5017GR-TF User's Manual
Notes
2-10
Chapter 3: System Interface
Chapter 3
System Interface
3-1 Overview
There are several LEDs on the control panel as well as others on the drive carriers to keep you constantly informed of the overall status of the system as well
as the activity and health of specifi c components. There are also two buttons on
the chassis control panel and an on/off switch on the power supply. This chapter
explains the meanings of all LED indicators and the appropriate response you may
need to take.
3-2 Control Panel Buttons
There are two push-buttons located on the front of the chassis: a reset button and
a power on/off button.
Reset
Use the reset button to reboot the system.
Power
The main power button is used to apply or remove power from the power supply
to the server system. Turning off system power with this button removes the main
power but keeps standby power supplied to the system.
3-1
SUPERSERVER 5017GR-TF User's Manual
3-3 Control Panel LEDs
The control panel located on the front of the SC818G chassis has fi ve LEDs. These
LEDs provide you with critical information related to different parts of the system.
This section explains what each LED indicates when illuminated and any corrective
action you may need to take.
Universal Information LED
When this LED blinks red quickly, it indicates a fan failure. This LED will be blue
when used for UID (Unit Identifi er). When on continuously it indicates an overheat
condition, which may be caused by cables obstructing the airfl ow in the system or
the ambient room temperature being too warm. Check the routing of the cables and
make sure all fans are present and operating normally. You should also check to
make sure that the chassis covers are installed. Finally , verify that the heatsinks are
installed properly (see Chapter 5). This LED will remain fl ashing or on as long as the
indicated condition exists. See the table below for descriptions of the LED states.
Figure 3-1. Universal Information LED States
Universal Information LED States
State Indication
Fast Blinking Red (1x/sec)Fan Fail
Solid RedCPU Overheat
Solid BlueLocal UID Button Depressed
Blinking BlueIPMI-Activated UID
Note: deactivating the UID LED must be performed in the same way it was activated.
(If the UID LED was activated via IPMI, you can only turn the LED off via IPMI and
not with the UID button.)
2
NIC2
Indicates network activity on LAN2 when fl ashing .
3-2
Chapter 3: System Interface
1
NIC1
Indicates network activity on LAN1 when fl ashing .
HDD
This light i ndic ates SATA a nd/or DVD - ROM dr ive acti vity w hen fl ashing.
Power
Indic ates power is bein g supplied to the sy stem's power supply u nits. This LED
should normally be illuminated when the system is operating.
3-4 SATA Drive Carrier LEDs
• Green: Each Ser i al ATA drive carr ie r ha s a gr ee n LED. Wh en i ll umi nate d, t hi s
green LED (on th e front of the SATA drive ca rrier) indic ates drive act ivity. A
conne cti on to th e SATA ba ckp lane ena bles t his LED to b link on a nd of f when
that particular drive is being accessed. Please refer to Chapter 6 for instructions
on replacing failed SATA drives.
• Red: The red LED to indicate an SATA drive failure. If one of the SATA drives
fail, you should be notifi ed by your system management software. Please refer
to Chapter 6 for instructions on replacing failed SATA drives.
3-3
SUPERSERVER 5017GR-TF User's Manual
Notes
3-4
Chapter 4: System Safety
!
Chapter 4
System Safety
4-1 Electrical Safety Precautions
Note: power should always be disconnected before performing any service
on the system.
Basic electrical safety precautions shall be followed to protect yourself from harm
and the server from damage:
• Be aware of the locations of the power on/off switch on the chassis as well
as the room's emergency power-off switch, disconnection switch or electrical
outlet. If an electrical accident occurs, you can then quickly remove power from
the system.
• Do not work alone when working with high voltage components.
• Power should always be disconnected from the system when removing or in-
stalling main system components, such as the serverboard, memory modules
and fl oppy drive. When disconnecting power, you should fi rst power down the
system with the operating system fi rst and then unplug the power cords of all
the power supply units in the system.
• When working around exposed electrical circuits, another person who is familiar
with the power-off controls should be nearby to switch off the power if necessary.
• Use only one hand when working with powered-on electrical equipment. This
is to avoid making a complete circuit, which will cause electrical shock. Use
extreme caution when using metal tools, which can easily damage any electrical
components or circuit boards they come into contact with.
• Do not use mats designed to decrease static electrical discharge as protection
from electrical shock. Instead, use rubber mats that have been specifi cally
designed as electrical insulators.
• The power supply power cords must include a grounding plug and must be
plugged into grounded electrical outlets.
4-1
SUPERSERVER 5017GR-TF User's Manual
!
• This product may be connected to an IT power system. In all cases, make sure
that the unit is also reliably connected to Earth (ground).
• Serverboard Battery: CAUTION - There is a danger of explosion if the onboard
battery is installed upside down, which will reverse its polarites (see Figure 4-1).
This battery must be replaced only with the same or an equivalent type recommended by the manufacturer (CR2032). Dispose of used batteries according to
the manufacturer's instructions.
• DVD-ROM Laser: CAUTION - this server may have come equipped with a
DVD-ROM drive. To prevent direct exposure to the laser beam and hazardous
radiation exposure, do not open the enclosure or use the unit in any unconventional way.
ture Coeffi cient) fuses on the mainboard must be replaced by trained service
technicians only. The new fuse must be the same or equivalent as the one
replaced. Contact technical support for details and support.
4-2 General Safety Precautions
Follow these rules to ensure general safety:
• Keep the area around the server clean and free of clutter.
• The server weighs approximately 47 lbs. (21.4 kg)47 lbs. (21.4 kg) . When lifting
the system, two people at either end should lift slowly with their feet spread out
to distribute the weight. Always keep your back straight and lift with your legs.
• Place the chassis top cover and any system components that have been re-
moved away from the system or on a table so that they won't accidentally be
stepped on.
• While working on the system, do not wear loose clothing such as neckties and
unbuttoned shirt sleeves, which can come into contact with electrical circuits or
be pulled into a cooling fan.
4-2
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