ASROCK Rack 3U8G+/C621 User manual

3U8G+/C621
User Manual
Version 1.0
Published May 2018
Copyright©2018 ASRock Rack INC. All rights reserved.

Version 1.0
Published June 2018
Copyright©2018 ASRock Rack Inc. All rights reserved.
Copyright Notice:
No part of this documentation may be reproduced, transcribed, transmitted, or
translated in any language, in any form or by any means, except duplication of
documentation by the purchaser for backup purpose, without written consent of
ASRock Rack Inc.
Products and corporate names appearing in this documentation may or may not
be registered trademarks or copyrights of their respective companies, and are used
only for identication or explanation and to the owners’ benet, without intent to
infringe.
Disclaimer:
Specications and information contained in this documentation are furnished
for informational use only and subject to change without notice, and should not
be constructed as a commitment by ASRock Rack. ASRock Rack assumes no
responsibility for any errors or omissions that may appear in this documentation.
With respect to the contents of this documentation, ASRock Rack does not provide
warranty of any kind, either expressed or implied, including but not limited to
the implied warranties or conditions of merchantability or tness for a particular
purpose.
In no event shall ASRock Rack, its directors, ocers, employees, or agents be liable
for any indirect, special, incidental, or consequential damages (including damages
for loss of prots, loss of business, loss of data, interruption of business and the
like), even if ASRock Rack has been advised of the possibility of such damages
arising from any defect or error in the documentation or product.
is device complies with Part 15 of the FCC Rules. Operation is subject to the following
two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that
may cause undesired operation.
CALIFORNIA, USA ONLY
e Lithium battery adopted on this motherboard contains Perchlorate, a toxic substance
controlled in Perchlorate Best Management Practices (BMP) regulations passed by the
California Legislature. When you discard the Lithium battery in California, USA, please
follow the related regulations in advance.
“Perchlorate Material-special handling may apply, see www.dtsc.ca.gov/hazardouswaste/
perchlorate”
ASRock Rack’s Website: www.ASRockRack.com

Setting up the Server in a Restricted Access Location
• Access can only be gained by service persons or by users who have been instructed
about the reasons for the restrictions applied to the location and about any precautions
that shall be taken.
• Access is through the use of a tool or lock and key, or other means of security, and is
controlled by the authority responsible for the location.
• Leave enough clearance (25 inches in the front and 30 inches in the back of the rack) to
allow the front door to be opened completely and to allow for sucient airow.
• is product is for installation merely in a Restricted Access Location.
• is 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.
Replaceable Batteries
CAUTION
RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE.
DISPOSE OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS
Warning
When removal of the chassis lid required for servicing:
- Turn o power and unplug any power cords/cables, and
- Reinstall the chassis lid before restoring power.
Important Safety Instructions
Pay close attention to the following safety instructions before performing any of
the operation. Basic safety precautions should be followed to protect yourself from
harm and the product from damage:
• Operation of the product should be carried out by suitably trained, qualied, and
certied personnel only to avoid risk of injury from electrical shock or energy hazard.
• Disconnect the power cord from the wall outlet when installing or removing main
system components, such as the motherboard and power supply unit.
• Place the system on a stable and at surface.
• Use extreme caution when working with high-voltage components.
• When handling parts, use a grounded wrist strap designed to prevent static discharge.
• Keep the area around the system clean and clutter-free.
• Keep all components and printed circuit boards (PCBs) in their antistatic bags when
not in use.
• Handle a board by its edges only; do not touch its components, peripheral chips,
memory modules or contacts.

Contents
Chapter 1 Introduction 1
1.1 Shipping Box Contents 2
1.2 Specications 3
Chapter 2 Server System Overview 4
2.1 System Components 4
2.2 Internal Features 5
2.3 System Front Panel 6
2.4 System Rear Panel 7
2.5 Front Control Panel Buttons and LEDs 8
2.6 PSU LED 10
2.7 Drive Tray LEDs 10
2.8 Fan Failed LED 11
Chapter 3 Hardware Installation and Maintenance 12
3.1 Server Top Cover 13
3.2 Hard Drive 17
3.3 Power Supply 19
3.4 System Fan 21
3.5 PCI Express Card 27
3.6Motherboard Tray 29
3.7 Add-on Card & Mezzanine Card 32
3.7.1 Installing an Add-on Card 32
3.7.2 Installing a Mezzanine Adapter Card (4U10G_SL2M) 35
3.8 Air Duct 39

Appendix A 42
SLIMLINE Connections 42
Appendix B 45
System Block Diagram 45
Appendix C 46
Serverboard Block Diagram 46
Appendix D 47
Motherboard Layout 47
Appendix E 50
Installing the CPU (Socket: LGA2011 R3) 50
Installing the CPU (Socket: LGA2011) 53
Installing the CPU Fan and Heatsink 56
Installation of Memory Modules (DIMM) 57
Appendix F 58
Installing the Server in a Rack 58

3U8G+/C621
PB 1
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Chapter 1 Introduction
ank you for purchasing 3U8G+/C621, a reliable barebone system produced
under ASRock Rack’s consistently stringent quality control. It delivers excellent
performance with robust design conforming to ASRock Rack’s commitment to
quality and endurance.
Because the hardware specications might be updated, the content of this documentation
will be subject to change without notice. In case any modications of this documentation
occur, the updated version will be available on ASRock Rack’s website without further
notice. If you require technical support related to this product, please visit our website for
specic information about the model you are using.
ASRock Rack’s Website: www.ASRockRack.com
e illustrations shown in this manual are examples only, the actual system may dier
slightly .

2 3
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1.1 Shipping Box Contents
* e components are pre-installed.
If any items are missing or appear damaged, contact your authorized dealer.
Item Quantity
3U8G+/C621 Barebone (3U form factor) 1
System Boards (MB)* 1
Power Supply Units* 4
System Fans* 8
HDD Backplane (BPB)* 1
Front Panel Board* 1
Power Distribution Boards (PDB)* 1
Switch Board (SWB)* 1
Power Cable, ATX 24Pin, PDB to MB, 520mm* 1
Power Cable, ATX 8Pin-1, PDB to MB, 470mm* 1
Power Cable, ATX 8Pin-2, PDB to MB, 500mm* 1
PMBus Cable, PDB to MB(1*5Pin), 470mm* 1
3U Front Control Cable (1 to 4 connectors)* 1
3U USB Cable 9Pin, 850mm* 1
MiniSAS Cable, 380mm (SATA0-3)* 1
SATA Cable, 310mm (SATA4 / SATA5)* 2
BPB Power Cable, PDB to HDD BPB* 2
3U MNG Cable, Pitch 2.0 1*5P, 610mm* 1
GPGPU Power Cable* 8
VGA Cable 1
Accessory Box 1
Support CD 1
User Manual 1
Quick Installation Guide 1
4U Top Cover 2
4U10G_SL2P 2
4U10G_SL2M 1

3U8G+/C621
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1.2 Specications
3U8G+/C621
System Physical Status
Form Factor 3U Rackmount
Dimension
(D x W x H)
27.6" x 16.9" x 5.1" (711 x 430 x 130.35 mm)
Support MB Size CEB (EP2C621D16GM / EP2C621D16GM-2T)
Front Panel
Buttons • Power On/Standby button
• ID button*
• System reset button
• NMI button*
LEDs • Power LED
• Identication LED*
• Hard drive activity LED*
• 4 x Network activity LEDs*
• System event LED*
I/O Ports 2 x USB 2.0 ports
1 x VGA port
Drive Bay
External 6 x 2.5" SATA HDD (6Gb/s) or 6 x SAS HDD* (12Gb/s)
*A PCIE RAID card is required for SAS support.
System Cooling
Fan 8 x 80*38 mm system fans
Power Supply
Capacity 4 (3+1), Redundant
Output Watts 1200W @ 200Vac~264Vac
System Switch Board
Switch IC PLX 8747 x 4
GPGPU Card
GPGPU Watts Max 300w /per card
Expansion Slot
PCIE / GPGPU
Card
Front Panel: 16 single-width / 8 x double-width cards
Rear Panel: 2 x PCIE cards*
* PCIE cards and mezzanine cards share the same slots. Install one card at a time.
* A riser card (4U10G_SL2P), pre-installed on the assembly, is required for PCIE
card installation.
Mezzanine Card Rear Panel: 2 x Mezzanine cards (M599R / M41202R supported)
(with a riser card (4U10G_SL2P))*
* PCIE cards and mezzanine cards share the same slots. Install one card at a time.
* A mezzanine adapter card (4U10G_SL2M) and riser card (4U10G_SL2P), pre-
installed on the assembly, are required for mezzanine card installation.

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Chapter 2 Server System Overview
is chapter provides diagrams showing the location of important components of
the server system.
2.1 System Components
6 x 2.5” Hot-Swap HDD Trays
Server Board
Power Supply Units
8 x Hot-Swap System Fans
16 x PCIE Card Slots
Front Controls and Indicators
VGA Port

3U8G+/C621
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2.2 Internal Features
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
10 11 12 13
14 15 16 17
5
1
6
8
7
9
234
35
34

6 7
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No. Item
1Power Supply Unit (PSU) 4
2Power Supply Unit (PSU) 3
3Power Supply Unit (PSU) 2
4Power Supply Unit (PSU) 1
5Serverboard
66 x 2.5" SATA HDDs (Hot-swapable)
7HDD Backplane Board (BPB)
8Power Distribution Board (PDB)
9Switch Board (SWB)
10 System Fan 2
11 System Fan 4
12 System Fan 6
13 System Fan 8
14 System Fan 1
15 System Fan 3
16 System Fan 5
17 System Fan 7
18 PCIE Card Slot 1
2.3 System Front Panel
2
134
No. Description
1 Control Panel Buttons and LEDs
2 2 x USB 2.0 Ports
3 16 x PCIE Card Slots (single-width)
4 1 x VGA Port
No. Item
19 PCIE Card Slot 2
20 PCIE Card Slot 3
21 PCIE Card Slot 4
22 PCIE Card Slot 5
23 PCIE Card Slot 6
24 PCIE Card Slot 7
25 PCIE Card Slot 8
26 PCIE Card Slot 9
27 PCIE Card Slot 10
28 PCIE Card Slot 11
29 PCIE Card Slot 12
30 PCIE Card Slot 13
31 PCIE Card Slot 14
32 PCIE Card Slot 15
33 PCIE Card Slot 16
34 Front Controls and USB Ports
35 VGA Port

3U8G+/C621
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2.4 System Rear Panel
33
HDD0
HDD1
HDD2
HDD3
HDD5 NVMe SLOT2 SLIMLINE x16 SLOT1 SLIMLINE x8
HDD4 NVMe
5
4
12
WARNING! Do NOT open the tray if the server
is not powered down or while it is still running.
!
Redundant PSU 3+1: Only one PSU is allowed to be removed while the server is running.
6
No. Description
1 6 x 2.5" HDD trays
*HDD4 and HDD5 supports NVMe HDD.
2 I/O Shield
*Depending on the specication of the server board
3 PCI Express Card Slot or Mezzanine Card Slot
*You can install either a PCIE card or a mezzanine card to this slot with a riser-card assembly.
e riser card (4U10G_SL2P) is pre-installed to the assembly.
*If you want to install a mezzanine card (only M599R and M41202R supported), a mezzanine
adapter card (4U10G_SL2M) is required.
* Slot1 supports Slimline X8; Slot2 supports Slimline X16
4Motherboard Tray Handle
*WARNING! Please do NOT open the tray if the server is not powered down or while it is still
running.
5Rea r Vent
6 4 x Power Supply Units (Redundant PSU 3+1)
*Server requires 3 working PSUs, with 1 redundant PSU. You must have at least three active sup-
plies, installed, functioning and connected to AC. Only one of the PSUs is allowed to be removed
while the server is running.

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2.5 Front Control Panel Buttons and LEDs
Front Control Panel
2
7
3
6
5
4
UID
NMI RST
L1 L2
L3 L4
PWR
BTN
!
1
No. Description
1 Power Button and LED
2 UID Button and LED*
3 LAN1, LAN2, LAN3, LAN4 Activity LEDs*
4 HDD Activity LED
5 System Event LED*
6 NMI (Nonmaskable Interrupt) Button*
7 System Reset Button
*Please be noted that the functions are supported depending on the type of the server board.
Power Button
Press the power switch button to toggle the system power on and standby/sleep modes.
To remove all power from the system completely, disconnect the power cord from the
server.
ID Button
Press the ID button to toggle the front panel ID LED and the baseboard ID LED on and
o. You are able to locate the server you’re working on from behind a rack of servers.

3U8G+/C621
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NMI (Nonmaskable Interrupt) Button
Press the NMI button with a paper clip or pin to generate a nonmaskable interrupt and to
put the server in a halt state for examination.
System Reset Button
When the system is completely unresponsive, press the system reset button to reboot the
server without shutting it o and initialize the system.
Status LED Denitions
Power LED
Status Description
Green Power on
O Power o
ID LED
Status Description
Blue System identication is active.
O System identication is disabled.
LAN1, LAN2, LAN3, LAN4 LEDs
Status Description
Green Link between system and network or no access
Blinking Green Network access
HDD Activity LED
Status Description
Blinking Green HDD access
O HDD idle
System Event LED
Status Description
O Running or normal operation
Red At least one sensor has critical alert

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2.6 PSU LED
PSU LED
PSU Status LED
Status Description
Green Normal work; output ON and OK
Amber Module fault/protection in operating mode
(failure, OCP, OVP, Fan Fail, OTP, UVP)
AC cord unplugged
Amber blinking at 0.5Hz Warning (high temp, high power, high current, slow fan)
Green blinking at 0.5Hz AC Present Only 12VSB on (PS o) or PS in Smart
Redundant state
2.7 Drive Tray LEDs
1
2
No. Description
1 HDD Power LED
2 HDD Activity LED
Status LED Denitions
HDD Power LED
Status Description
Blue HDD powered-on
O No power to HDD

3U8G+/C621
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HDD Activity LED
Status Description
Solid Green HDD active
Blinking Green HDD accessing or reading
Red HDD failed
O HDD powered-o
2.8 Fan Failed LED
Fan Failed LED
Fan LED
Status Description
Solid Red Fan failed
O Normal

12 13
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Chapter 3 Hardware Installation and
Maintenance
is chapter helps you assemble the chassis and install components.
Before You Begin
Before you work with the server, pay close attention to the “Important Safety Instructions”
at the beginning of this manual.
1. Make sure the server is powered o.
Power down the server if it is still running.
(1) Press the Power button to power o the server from full-power mode to standby-
power (sleep) mode. e Power LED at the front turns from solid green to blinking
green.
(2) Disconnect the power cord rst from the AC outlet and then from the server.
e power LED turns o.
2. Ensure you have a clean and stable working environment. Avoid dust and dirt because
contaminants may cause malfunctions.
3. Ground yourself properly before touching any system component. A discharge of static
electricity may damage components. Wear a grounded wrist strap if available.
Installing Procedures
e followings are prerequisite to be installed.
• 2.5" HDD(s)
• Power Supply Units (Pre-installed)
• System Fans (Pre-installed)
• Server Board (Pre-installed)
• HDD Backplane (Pre-installed)
• Switch Board (Pre-installed)
• Power Distribution Board (Pre-installed)
e server is not completely powered down when you press the Power button on the front
panel. e Power button lets the server toggle between Power On and Standby (Sleep)
modes. Some internal circuitry remain active in the Standby mode. To remove all power
from the system completely, be sure to disconnect the power cord from the server.
1. Some components are already pre-installed. Simply properly connect the relavant cables before
or aer installation. See the Quick Installation Guide for more details.
2. Refer to the user manual of the server board you use for instructions on how to install server
board components.

3U8G+/C621
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3.1 Server Top Cover
Removing the Server Top Covers
(A) Top Front Cover
2
3Top Front Cover
1
1
1
1. Remove the screws that secure the top front cover to the chassis.
2. Li up and remove the top front cover.
1. Before removing the top covers, power o the server and unplug the power cord.
2. e system must be operated with all the chassis top covers installed to ensure proper cooling.

14 15
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(B) Top Middle Cover
1. Remove the screws that secure the top middle cover to the chassis.
2. Li up and remove the top middle cover.
1
1
1
2
(C) Top Rear Cover
1. Remove the screws that secure the top rear cover to the chassis.
2. Push the top rear cover toward the FRONT of the chassis to remove the cover from the
locked position.
3. Li up and remove the top rear cover.
Top Rear Cover
2
3
1
1

3U8G+/C621
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Installing the Server Top Covers
1. Lower the top rear cover on the chassis, making sure the side latches align with the
cutouts.
2. Slide the top rear cover toward the REAR of the chassis.
3. Secure the top rear cover with the screws.
4. Lower the top middle cover on the chassis and secure it with the screws.
Top Rear Cover
3
3
2
1
4