Supermicro SuperStorageSystem 6048R-E1CR45H User manual

SuperStorageSystem
6048R-E1CR45H
6048R-E1CR45L
USER’S MANUAL
Revision 1.0a

The information in this User’s Manual has been carefully reviewed and is believed to be accurate.
The vendor assumes no responsibility for any inaccuracies that may be contained in this document,
makes no commitment to update or to keep current the information in this manual, or to notify any
person or organization of the updates. Please Note: For the most up-to-date version of this
manual, please see our web site at www.supermicro.com.
Super Micro Computer, Inc. ("Supermicro") reserves the right to make changes to the product
described in this manual at any time and without notice. This product, including software and docu-
mentation, is the property of Supermicro and/or its licensors, and is supplied only under a license.
Any use or reproduction of this product is not allowed, except as expressly permitted by the terms
of said license.
IN NO EVENT WILL SUPERMICRO BE LIABLE FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL,
SPECULATIVE OR CONSEQUENTIAL DAMAGES ARISING FROM THE USE OR INABILITY TO
USE THIS PRODUCT OR DOCUMENTATION, EVEN IF ADVISED OF THE POSSIBILITY OF
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HARDWARE, SOFTWARE, OR DATA STORED OR USED WITH THE PRODUCT, INCLUDING THE
COSTS OF REPAIRING, REPLACING, INTEGRATING, INSTALLING OR RECOVERING SUCH
HARDWARE, SOFTWARE, OR DATA.
Any disputes arising between manufacturer and customer shall be governed by the laws of Santa
Clara County in the State of California, USA. The State of California, County of Santa Clara shall
be the exclusive venue for the resolution of any such disputes. Super Micro's total liability for all
claims will not exceed the price paid for the hardware product.
FCC Statement: This equipment has been tested and found to comply with the limits for a Class A
digital device pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment is operated in a commercial environ-
ment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with the manufacturer’s instruction manual, may cause harmful interference
with radio communications. Operation of this equipment in a residential area is likely to cause harmful
interference, in which case you will be required to correct the interference at your own expense.
California Best Management Practices Regulations for Perchlorate Materials: This Perchlorate warn-
ing applies only to products containing CR (Manganese Dioxide) Lithium coin cells. “Perchlorate
Material-special handling may apply. See www.dtsc.ca.gov/hazardouswaste/perchlorate”
WARNING: Handling of lead solder materials used in this
product may expose you to lead, a chemical known to the
State of California to cause birth defects and other repro-
ductive harm.
Manual Revision 1.0a
Release Date: March 22, 2018
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 © 2018 by Super Micro Computer, Inc.
All rights reserved.
Printed in the United States of America

iii
Preface
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 SSG-6048R-E1CR45H/L.
Installation and maintenance should be performed by experienced technicians only.
The SSG-6048R-E1CR45H/L. is a high-end storage system based on the
SC946LTS-R1K66P 4U rackmount chassis and the X10DSC+ dual processor
serverboard.
Manual Organization
Chapter 1: Introduction
            
system and describes the main features of the X10DSC+ serverboard and the
SC946LTS-R1K66P chassis.
Chapter 2: Server Installation
This chapter describes the steps necessary to install the SSG-6048R-E1CR45H/L.

If your server was ordered without processor and memory components, this chapter
will refer you to the appropriate sections of the manual for their installation.
Chapter 3: System Interface
Refer here 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: Standardized Safety Warnings
You should thoroughly familiarize yourself with this chapter for a general overview
of safety precautions that should be followed when installing and servicing the
SSG-6048R-E1CR45H/L..

SuperStorageSystem SSG-6048R-E1CR45H/L User's Manual
iv
Chapter 5: Advanced Serverboard Setup
Chapter 5 provides detailed information on the X10DSC+ serverboard, including the
locations and functions of connections, headers and jumpers. Refer to this chapter

serverboard.
Chapter 6: Advanced Chassis Setup
Refer to Chapter 6 for detailed information on the SC946LTS-R1K66P chassis.
You should follow the procedures given in this chapter when installing, removing or

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 Error Beep Codes
Appendix B: System Specications

Notes
Preface
v

vi
Table of Contents
Chapter 1 Introduction
1-1 Overview ......................................................................................................... 1-1
1-2 Serverboard Features ..................................................................................... 1-2
Processors ...................................................................................................... 1-2
Memory ........................................................................................................... 1-2
Main Storage Controller .................................................................................. 1-2
Serial ATA........................................................................................................ 1-2
PCI Expansion Slots ....................................................................................... 1-3
Rear I/O Ports................................................................................................. 1-3
1-3 Server Chassis Features ................................................................................ 1-3
System Power................................................................................................. 1-3
Hard Drives ..................................................................................................... 1-3
Front Control Panel......................................................................................... 1-3
Cooling System............................................................................................... 1-3
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
2-4 Warnings and Precautions .............................................................................. 2-2
Rack Precautions............................................................................................ 2-2
Server Precautions.......................................................................................... 2-2
Rack Mounting Considerations ....................................................................... 2-3
Ambient Operating Temperature ................................................................ 2-3
 ......................................................................................... 2-3
Mechanical Loading ................................................................................... 2-3
Circuit Overloading..................................................................................... 2-3
Reliable Ground ......................................................................................... 2-3
2-5 Rack Mounting Instructions............................................................................. 2-4
Identifying the Sections of the Rack Rails...................................................... 2-4
Locking Tabs ................................................................................................... 2-4
Releasing the Inner Rail ................................................................................. 2-5
Installing The Inner Rails on the Storage Chassis ......................................... 2-7
Installing the Outer Rails on the Rack............................................................ 2-8
Installing to the Rack ...................................................................................... 2-9
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vii
Optional Quick Installation Method ............................................................... 2-10
Accessing Top-Loading Hard Drives .............................................................2-11
Adapters for Round and Threaded Hole Racks ............................................2-11
Chapter 3 System Interface
3-1 Overview ......................................................................................................... 3-1
3-2 Control Panel Buttons ..................................................................................... 3-2
3-3 Control Panel LEDs ........................................................................................ 3-2
3-4 Drive Carrier LEDs.......................................................................................... 3-4
SAS3/SATA3 Drives ........................................................................................ 3-4
3-5 System Status LCD Screen ............................................................................ 3-5
Introduction...................................................................................................... 3-5
Main Screen.................................................................................................... 3-6
System Status Submenu ................................................................................ 3-6
Processor Status........................................................................................ 3-7
Memory Status ........................................................................................... 3-7
Hard Disk Drive Status............................................................................... 3-7
Power Supply Status.................................................................................. 3-7
Cable Connection Status ........................................................................... 3-7
Fans Status ................................................................................................ 3-7
Thermal Monitor.............................................................................................. 3-7
IPMI Submenu ................................................................................................ 3-8
System Info ................................................................................................ 3-8
IPMI Event Log........................................................................................... 3-9
LCD Test..................................................................................................... 3-9
Settings Submenu........................................................................................... 3-9
Error Message................................................................................................. 3-9
UID Message ............................................................................................... 3-10
Chapter 4Standardized Warning Statements for AC Systems
4-1 About Standardized Warning Statements....................................................... 4-1
........................................................................................... 4-1
Installation Instructions.................................................................................... 4-4
Circuit Breaker ................................................................................................ 4-5
Power Disconnection Warning ........................................................................ 4-6
Equipment Installation..................................................................................... 4-8
Restricted Area................................................................................................ 4-9
Battery Handling............................................................................................ 4-10
Redundant Power Supplies .......................................................................... 4-12
Table of Contents

viii
Backplane Voltage ........................................................................................ 4-13
Comply with Local and National Electrical Codes........................................ 4-14
Product Disposal........................................................................................... 4-15
Hot Swap Fan Warning................................................................................. 4-16
Power Cable and AC Adapter ...................................................................... 4-18
Chapter 5 Advanced Serverboard Setup
5-1 Handling the Serverboard ............................................................................... 5-1
Precautions ..................................................................................................... 5-1
5-2 Connecting Cables.......................................................................................... 5-1
Connecting Data Cables ................................................................................. 5-2
Connecting Power Cables .............................................................................. 5-2
Connecting the Control Panel......................................................................... 5-2
5-3 Rear I/O Ports................................................................................................. 5-3
5-4 Installing the Processor and Heatsink ............................................................ 5-4
Installing an LGA2011 Processor.................................................................... 5-4
Installing a Passive CPU Heatsink ................................................................. 5-7
Removing the Heatsink................................................................................... 5-7
5-5 Installing Memory............................................................................................ 5-8
Memory Support.............................................................................................. 5-8
DIMM Installation ............................................................................................ 5-8
5-6 Serverboard Details ...................................................................................... 5-10
 ................................................................................... 5-12
5-8 Jumper Settings ............................................................................................ 5-19
5-9 Onboard Indicators........................................................................................ 5-21
5-10 SAS/SATA Ports............................................................................................ 5-22
5-11 Installing Software......................................................................................... 5-23
SuperDoctor® 5 ............................................................................................ 5-24
5-12 Onboard Battery............................................................................................ 5-25
Chapter 6 Advanced Chassis Setup
6-1 Static-Sensitive Devices.................................................................................. 6-1
Precautions ..................................................................................................... 6-1
6-2 Control Panel .................................................................................................. 6-2
6-3 Opening and Closing the Chassis Cover........................................................ 6-3
6-4 System Fans ................................................................................................... 6-4
Individual fans ................................................................................................. 6-4
Dual Rear Fan Module.................................................................................... 6-5
6-5 Installing the HDD Support Partitions ............................................................. 6-6
6-6 Installing Hot-Swappable 3.5" Hard Drives..................................................... 6-7
SuperStorageSystem SSG-6048R-E1CR45H/L User's Manual

iv
Installing Hard Drives Into Carriers................................................................. 6-8
Installing Hard Drive Carriers into the Storage Chassis................................. 6-9
6-7 Installing Optional Rear 2.5" Hot-Swappable Drives ...................................... 6-9
Installing Hard Drives Into the Rear Carriers.................................................. 6-9
6-8 Installing Hot-Swappable Optional NVMe Drives ......................................... 6-12
Installing the NVMe Drive Cage.................................................................... 6-12
Installing NVMe Drive Carriers into the NVMe Drive Cage.......................... 6-13
6-9 Accessing the Motherboard for Memory Upgrades and Maintenance ......... 6-14
Expansion Card Setup .................................................................................. 6-15
PCI Slot Setup for Expansion Cards ............................................................ 6-15
Installing the SIOM Network Module ............................................................ 6-16
Installing Heatsinks ....................................................................................... 6-17
6-10 IPMI Connector ............................................................................................. 6-18
6-11 Accessing the Backplane and Power Card .................................................. 6-19
6-12 Installing the Cable Management Arm ......................................................... 6-20
6-13 Power Supply ............................................................................................... 6-24
Chapter 7 BIOS
7-1 Introduction...................................................................................................... 7-1
Starting BIOS Setup Utility.............................................................................. 7-1
 ......................................................... 7-1
How to Start the Setup Utility ......................................................................... 7-2
7-2 Main Setup...................................................................................................... 7-2
 ...................................................................... 7-4
7-4 Event Logs .................................................................................................... 7-30
7-5 IPMI............................................................................................................... 7-32
7-6 Security Settings ........................................................................................... 7-34
7-7 Boot Settings................................................................................................. 7-36
7-8 Save & Exit ................................................................................................... 7-38
Appendix A BIOS Error Beep Codes
Appendix B System Specications
Table of Contents

Notes
SuperStorageSystem SSG-6048R-E1CR45H/L User's Manual
x

Chapter 1
Introduction
1-1 Overview
The SuperStorageSystem SSG-6048R-E1CR45H/L is a high-end server comprised
of two main subsystems: the SC946LTS-R1K66P 4U/rackmount chassis and the
X10DSC+ dual processor serverboard. Please refer to our website for informa-
www.
supermicro.com).
In addition to the serverboard and chassis, various hardware components have
been included with the SSG-6048R-E1CR45H/L, as listed below:
• Two passive CPU heatsinks (SNK-P0048PS)
• Five 8-cm rear exhaust fans (FAN-0184L4)
• Hardware RAID controller:
6048R-E1CR45H: AOC-S3108M-H8L-P
6048R-E1CR45L: AOC-S3008L-L8-P
• SAS/SATA Accessories
One (1) SAS/SATA backplanes (BPN-SAS3-946LEL1)

Two (2) 2.5" toolless drive carriers (MCP-220-00117-0B)
• One set of mounting rails (MCP-290-00150-0N)
Note: For your system to work properly, please follow the links below to download
all necessary drivers/utilities and the user’s manual for your server.
• Supermicro product manuals: http://www.supermicro.com/support/manuals/
• Product drivers and utilities: ftp://ftp.supermicro.com
• Product safety info: http://www.supermicro.com/about/policies/safety_informa-
tion.cfm
• If you have any questions, please contact our support team at:
[email protected]
Chapter 1: Introduction
1-1

1-2
SuperStorageSystem SSG-6048R-E1CR45H/L User's Manual
1-2 Serverboard Features
The SuperStorageSystem SSG-6048R-E1CR45H/L is built around the X10DSC+,
a dual processor serverboard based on the Intel C612 chipset. Below are the main
features of the X10DSC+. (See Figure 1-1 for a block diagram of the chipset.)
Processors
The X10DSC+ supports single or dual Intel® Xeon E5-2600 (v3/v4) Series pro-
cessors. Please refer to the serverboard description pages on our website for a
complete listing of supported processors (www.supermicro.com).
Memory
The X10DSC+ has twenty-four (24) DIMM slots that can support up to
1.5 TB of Load Reduced (LRDIMM) or 768 GB of Registered (RDIMM) ECC
DDR4-2400/2133/1866/1600 memory. See Chapter 5 for details.
Main Storage Controller
The 6048R-E1CR45H includes an LSI 3108 controller card in the system to support
SATA 3.0/SAS 3.0 hard drives. (RAID 0, 1, 5, 6, 10, 50 and 60 supported). The
SATA/SAS drives are hot-swappable units.
The 6048R-E1CR45L has an LSI 3008 controller card included in the system to
support SATA 3.0/SAS 3.0 hard drives.
Note: Backplane naming rule follows.
P0 : 01 : 00 --> indicates 1st expander board, 1st drive, slot1 (out of 45 drives)
The LSI 3108 controller will recognize both backplanes in the system and assigns
them enclosure IDs. These IDs are assigned randomly regardless of how the back-
planes are physically connected. When using the MegaRAID utility, the customer


Serial ATA
A SATA controller is also integrated into the chipset to provide 10 SATA 3.0 (6/
Gbps) ports), which are RAID 0, 1, 5 and 10 supported. (RAID 5 supported with
Windows OS only).

1-3
Chapter 1: Introduction
PCI Expansion Slots
The X10DSC+ has two (2) PCI-E 3.0 x16 and one (1) PCI-E 3.0 x8 (the PCI-E 3.0
x8 slot is used for an add-on card).
Rear I/O Ports
The I/O ports include one COM port, a VGA port, two USB 3.0 ports and a dedicated
IPMI LAN (Ethernet) port.
1-3 Server Chassis Features
The SC946LTS-R1K66P is a 4U form factor chassis designed to be used in a
            
the chassis.
System Power
The SC946LTS-R1K66P features a redundant, hot-plug (two separate power mod-

you to replace a failed power supply without shutting down the system.
Hard Drives
         
loading 3.5" hard drives and two 2.5" hard drives at the rear of the chassis. All
drives use carriers and are hot-swappable units.
Front Control Panel
The control panel on the front of the chassis provides you with system monitoring
and control. LEDs indicate system power, HDD activity, network activity, system
information LED and power supply failure. A main power button and a system reset
button are also included.
In addition, an LCD screen is mounted on the front of the chassis to display system
and HDD information.
Cooling System

located at the rear of the chassis. Three of these fans can be removed individually,
while two are paired together in a dual-fan module.

1-4
SuperStorageSystem SSG-6048R-E1CR45H/L User's Manual
Figure 1-1. Intel C612 Chipset:
System Block Diagram
Note: This is a general block diagram. Please see Chapter 5 for details.
DDR4 DIMM
X10DSC+ Block Diagram
C
D
#3
#2 #1
#1
#1#1
#2
#3
#2
#3
#3
#2
QPI0
DMI
PE3PE2PE1
A
B
H
G
#3
#2
SocketID 01
#1#1
#1#1
#2
#3
#2
#3
#3
#2
E
CPU2
DDR4 DIMM
F
QPI1
DMI
x16
NCSI
DDR3
UART
x4
8~11
x4
4~7
0~3
port 1,2
with RJ45
REAR
port 3
TYPE-A
x8
x16
PCIe Slot1
PCIe Slot2
PCIe Slot3
0~15
x8
x16 (0-15)
NCSI
NVMe1NVMe2NVMe3NVMe4
x4
12~15
x4
JMAZZ1 (SAS AOM1)
0~7
SPI
PEI
BMC
AST2400
HWM
VGA LAN
LPC
SPI USB
DDR3
VGA
32MB BMC
SPI Flash
MUX
16MB BMC
SPI Flash
SPI USB 2.0
[6/7]
LPC
PCH
PE[3] TPM Header
PHY
RTL8211E IPMI LAN
COM1
SATA Gen3 [2/3]
SATA Gen3 [0/1]
SATA_DOM1 SATA_DOM2
S-SATA1
S-SATA2
PE3 PE2 PE1 QP11QP10
32GB/s
32GB/s
16GB/s
QPI
QPI
9.6GT/s
Polarity Inversion Polarity Inversion
SocketID 00
CPU1
4GB/s
32GB/s
32GB/s
16GB/s
USB 2.0 [10/12/13]
USB 3.0 [1/2/6]
DDR4 DIM
M
DDR4 DIMM DDR4 DIMM DDR4 DIMM
DDR4 DIMM
DDR4 DIMM
#3
DDR4 DIMM
DMI
#3
DDR4 DIMM
9.6GT/s
SIOM SLOT
0~15

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)
Website: 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)
Website: www.supermicro.nl
Asia-Pacic
Address: Super Micro Computer, Inc.
3F, No. 150, Jian 1st Rd.
Zhonghe Dist., New Taipei City 235
Taiwan (R.O.C)
Tel: [phone]
Fax: [phone]
Email: [email protected]
Website: www.supermicro.com.tw

1-6
SuperStorageSystem SSG-6048R-E1CR45H/L 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 the SSG-6048R-E1CR45H/L
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 serverboard, processors, system
memory etc., please turn to the chapter or section noted in each step for details on

2-2 Unpacking the System
You should inspect the box the SSG-6048R-E1CR45H/L was shipped in and note

damage claim with the carrier who delivered it.
Decideon asuitable location forthe rackunit thatwillhold theSSG-6048R-E1CR45H/L.
It should be situated in a clean, dust-free area that is well ventilated. Avoid areas

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 SSG-6048R-E1CR45H/L was shipped in includes 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


2-2
SuperStorageSystem SSG-6048R-E1CR45H/L User's Manual
• 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 ac-
cording to §2 of the German Ordinance for Work with Visual Display Units.
2-4 Warnings and Precautions
Rack Precautions
• Ensure that the leveling jacks on the bottom of the rack are fully extended to

• 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.
• 
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 any hot plug 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
temperature of the rack environment may be greater than the room's ambient
temperature. Therefore, consideration should be given to installing the equipment
in an environment compatible with the manufacturer’s maximum rated ambient
temperature (Tmra).
Reduced Airow
  
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.).
Warning! To prevent bodily injury when mounting or servicing this unit in a
rack, you must take special precautions to ensure that the system remains
stable. The following guidelines are provided to ensure your safety:
• This unit should be mounted at the bottom of the rack if it is the only unit in
the rack.
• 
to the top with the heaviest component at the bottom of the rack.
• If the rack is provided with stabilizing devices, install the stabilizers before
mounting or servicing the unit in the rack.

2-4
SuperStorageSystem SSG-6048R-E1CR45H/L User's Manual
2-5 Rack Mounting Instructions
This section provides information on installing the 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 from the instructions provided. You
should also refer to the installation instructions that came with the rack unit you are

Identifying the Sections of the Rack Rails
The chassis package includes a rack rail assembly in the rack mounting kit. Each
assembly consists of three sections: an inner chassis rail that secures directly to
the chassis, an outer rail that secures to the rack, and a middle rail which extends

side of the chassis.
Locking Tabs
Each inner rail has a locking tab. This tab locks the chassis into place when installed
and pushed fully into the rack. These tabs also lock the chassis in place when fully
extended from the rack. This prevents the server from coming completely out of
the rack when the chassis is pulled out for servicing.
Figure 2-1. Identifying the Different Rail Sections
Inner Rail
Rail Assembly
(Shown with Rails
Retracted)
This Side Faces
Outward
Locking Tab
Middle Rail
Outer Rail