Dell PowerProtect DM5500 User manual

Dell PowerProtect Data Manager Appliance
5.12.0.1
Installation Guide for DM5500
November 2022
Rev. 01

Notes, cautions, and warnings
NOTE: A NOTE indicates important information that helps you make better use of your product.
CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid
the problem.
WARNING: A WARNING indicates a potential for property damage, personal injury, or death.
© 2022 Dell Inc. or its subsidiaries. All rights reserved. Dell Technologies, Dell, and other trademarks are trademarks of Dell Inc. or its
subsidiaries. Other trademarks may be trademarks of their respective owners.

Figures..........................................................................................................................................5
Tables........................................................................................................................................... 6
Preface......................................................................................................................................................................................... 7
Chapter 1: Overview.....................................................................................................................10
PowerProtect Data Manager Appliance introduction............................................................................................... 10
DM5500 front and internal views.................................................................................................................................. 10
DM5500 rear view.............................................................................................................................................................15
Hardware and software required for installation........................................................................................................16
Third-party rack requirements .......................................................................................................................................16
Chapter 2: Install the DM5500 in the rack....................................................................................18
Rack rails.............................................................................................................................................................................. 18
Installing the rails................................................................................................................................................................19
Installing the chassis retention brackets..................................................................................................................... 20
Unboxing the DM5500 and removing the shipping screws.................................................................................... 22
Removing drives................................................................................................................................................................ 22
Removing drive blanks................................................................................................................................................23
Removing the front bezel..........................................................................................................................................24
Opening the drive bays.............................................................................................................................................. 25
Closing the drive bays................................................................................................................................................ 26
Removing power supply units.........................................................................................................................................27
Installing the DM5500 into the rack............................................................................................................................. 27
Installing drives ................................................................................................................................................................. 29
Installing drive blanks....................................................................................................................................................... 30
Installing power supply units...........................................................................................................................................30
Installing the front bezel...................................................................................................................................................31
Chapter 3: Cabling and network requirements............................................................................. 33
Connect power cables......................................................................................................................................................33
Connect iDRAC cable....................................................................................................................................................... 33
Connect network cables..................................................................................................................................................33
Chapter 4: Configure iDRAC........................................................................................................ 36
Chapter 5: Pre-configuration tasks............................................................................................. 37
Collect external network information........................................................................................................................... 38
Management IP address............................................................................................................................................ 38
Data IP addresses........................................................................................................................................................38
DNS.................................................................................................................................................................................39
Collect DM5500 serial number, NTP, and time zone information.........................................................................39
Power on the DM5500.................................................................................................................................................... 39
Power on the DM5500 using iDRAC...................................................................................................................... 39
Power on the DM5500 using the power button..................................................................................................40
Contents
Contents 3

Assign static IP address to the service computer for initial DM5500 login........................................................40
Chapter 6: Configure the DM5500 in the Data Manager Appliance Configuration UI.................... 42
Log in to the Data Manager Appliance Configuration UI ........................................................................................42
Initial DM5500 configuration in the Data Manager Appliance Configuration UI................................................43
Log in to the Data Manager Appliance UI .................................................................................................................. 44
Getting Started window.................................................................................................................................................. 45
Chapter 7: Troubleshooting......................................................................................................... 46
4 Contents

1 DM5500 front view................................................................................................................................................. 10
2 Left control panel...................................................................................................................................................... 11
3 Right control panel....................................................................................................................................................11
4 Drive indicators......................................................................................................................................................... 12
5 View of drive bays extended..................................................................................................................................13
6 24 TB useable capacity DM5500 drive configuration..................................................................................... 14
7 96 TB useable capacity DM5500 drive configuration..................................................................................... 14
8 DM5500 back panel features................................................................................................................................ 15
9 L-Bracket Static rail................................................................................................................................................. 18
10 Installing the rail........................................................................................................................................................ 19
11 Chassis retention bracket on rear rack flange..................................................................................................20
12 Diagram and description of installing the chassis retention bracket...........................................................20
13 Remove the shipping screws................................................................................................................................ 22
14 Removing a drive carrier........................................................................................................................................ 23
15 Removing a drive blank.......................................................................................................................................... 24
16 Removing the front bezel...................................................................................................................................... 25
17 Opening the drive bays...........................................................................................................................................26
18 Closing drive bays.................................................................................................................................................... 26
19 Removing a power supply unit..............................................................................................................................27
20 Diagram and description of installing the DM5500 into the rack................................................................ 28
21 Installing a drive....................................................................................................................................................... 29
22 Installing a drive blank............................................................................................................................................ 30
23 Installing a power supply unit.................................................................................................................................31
24 Installing the front bezel........................................................................................................................................ 32
25 DM5500 recommended network connections (optical SFP28/SFP+ ports)........................................... 34
26 DM5500 recommended network connections (copper 10GBASE-T ports)..............................................34
Figures
Figures 5

1 Revision history...........................................................................................................................................................7
2 Typographical conventions...................................................................................................................................... 8
3 System health and system ID indicator codes................................................................................................... 11
4 iDRAC Direct LED indicator codes........................................................................................................................ 11
5 Drive indicator codes............................................................................................................................................... 12
6 Hardware and software requirements for DM5500 installation................................................................... 16
7 Static rails...................................................................................................................................................................18
8 Static rails adjustability........................................................................................................................................... 18
9 DM5500 NIC combinations................................................................................................................................... 34
10 Network cabling requirements............................................................................................................................. 35
11 Data Manager Appliance UI Getting Started menu items..............................................................................45
12 Data Manager Appliance Configuration UI error messages...........................................................................46
Tables
6 Tables

Preface
As part of an effort to improve product lines, periodic revisions of software and hardware are released. Therefore, all versions of
the software or hardware currently in use might not support some functions that are described in this document. The product
release notes provide the most up-to-date information on product features. If a product does not function correctly or does not
function as described in this document, contact a technical support professional.
NOTE: This document was accurate at publication time. To ensure that you are using the latest version of this document,
go to the Customer Support website.
Purpose
This document provides information on the hardware, software, and rack cabling requirements for the Dell PowerProtect
DM5500 Appliance installation and configuration.
Audience
This document guide is designed for personnel who install, configure, and maintain the DM5500 Appliance.
Revision history
Table 1. Revision history
Revision number Date Description
01 November 2022 First release of this document for the Dell PowerProtect DM5500
Appliance 5.12.0.1
Related documentation
The following publications are available on the Customer Support website and provide additional information.
●PowerProtect Data Manager Appliance Administrator Guide for DM5500
●PowerProtect Data Manager Appliance Security Configuration Guide for DM5500
●PowerProtect Data Manager Appliance Customer Replaceable Unit Procedures Guide for DM5500
●PowerProtect Data Manager Appliance Software Compatibility Guide for DM5500
●PowerProtect Data Manager Appliance Resiliency Guide for DM5500
●PowerProtect Data Manager Appliance Release Notes for DM5500
Special notice conventions used in this document
We use these conventions for special notices.
WARNING: A warning indicates a hazardous situation, which if not avoided, could result in serious injury or
death.
CAUTION: A caution indicates a hazardous situation, which if not avoided, could result in minor or moderate
injury.
NOTE: A note contains information that is incidental, but not essential, to the topic.
Preface 7

Typographical conventions
Table 2. Typographical conventions
Bold Used for names of interface elements, such as names of windows, dialog boxes, buttons,
fields, tab names, key names, and menu paths (what the user specifically selects or clicks)
Italic Used for full titles of publications referenced in text
Monospace Used for:
●System code
●System output, such as an error message or script
●Pathnames, filenames, prompts, and syntax
●Commands and options
Monospace italic Used for variables
Monospace bold Used for user input
[ ] Square brackets enclose optional values
| Vertical bar indicates alternate selections - the bar means "or"
{ } Braces enclose content that the user must specify, such as x or y or z
... Ellipses indicate nonessential information omitted from the example
Where to find product documentation
●The Customer Support website
●The Community Network
Where to get support
The Customer Support website provides access to product licensing, documentation, advisories, downloads, and how-to and
troubleshooting information. The information can enable you to resolve a product issue before you contact Customer Support.
To access a product-specific page:
1. Go to the Customer Support website.
2. In the search box, type a product name, and then from the list that appears, select the product.
Support library
The support library contains applicable solutions that you can search for either by solution number (for example, KB000xxxxxx)
or by keyword.
To search the support library:
1. Go to the Customer Support website.
2. On the Support tab, click Support Library.
3. In the search box, type either the solution number or keywords. Optionally, you can limit the search to specific products by
typing a product name in the search box, and then selecting the product from the list that appears.
Service requests
To obtain in-depth help from Licensing, submit a service request. To submit a service request:
1. Go to the Customer Support website.
2. On the Support tab, click Service Requests & Dispatch Status.
8Preface

NOTE: To create a service request, you must have a valid support agreement. For details about either an account or
obtaining a valid support agreement, contact a sales representative. To find the details of a service request, in the
Service Request Number field, type the service request number, and then click Search.
To review an open service request:
1. Go to the Customer Support website.
2. On the Support tab, click Service Requests & Dispatch Status, and sign into your account.
3. On the Service Requests page, click View All Service Requests.
Online communities
For peer contacts, conversations, and content on product support and solutions, go to the Community Network web page.
Interactively engage with customers, partners, and certified professionals online.
Reporting vulnerabilities
Dell takes reports of potential vulnerabilities in our products seriously. For the latest on how to report a security issue to Dell,
see the Dell Vulnerability Response Policy web page.
Preface 9

Overview
Topics:
•PowerProtect Data Manager Appliance introduction
•DM5500 front and internal views
•DM5500 rear view
•Hardware and software required for installation
•Third-party rack requirements
PowerProtect Data Manager Appliance introduction
The Dell PowerProtect Data Manager Appliance model DM5500 is an integrated solution that offers industry-leading de-
duplication and data protection solutions. The PowerProtect DM5500 Appliance is a Dell PowerEdge R740xd2 one-node server
(2U) server with two drive bays. Each drive bay has 12 drives for a total of 24 drives. The DM5500 Appliance supports 12 x 32
GB DIMMs with 12 TB to 96 TB storage capacity.
Network switches are not included with the DM5500 hardware and must be purchased separately or provided by the customer.
Two switches are recommended for redundancy. The following switches are compatible with the DM5500.
●SFP28 switches that support 10 GbE or 25 GbE and VLAN
●SFP+ switches that support 10 GbE and VLAN
●Switches that support 10GBASE-T copper cabling and VLAN
The DM5500 is shipped with a fixed rail kit and is installed in a customer-provided rack.
This guide describes DM5500 installation into the rack, cabling and network requirements, and the initial appliance configuration
in the PowerProtect DM5500 UI.
The DM5500 features, functionality, and configuration in the PowerProtect Data Manager Appliance UI are described in the
PowerProtect Data Manager Appliance Administrator Guide for DM5500.
DM5500 front and internal views
Figure 1. DM5500 front view
1. Left control panel 2. Drives (12)
3. Right control panel 4. Micro USB port
5. Right release latch 6. Left release latch
1
10 Overview

Control panels
Figure 2. Left control panel
1. System health and system ID indicator
2. Drive indicator
Table 3. System health and system ID indicator codes
System health and system ID
indicator code
Condition
Solid blue Indicates that the system is turned on, system is healthy, and system ID mode is not
active. Press the system health and system ID button to switch to system ID mode.
Blinking blue Indicates that the system ID mode is active. Press the system health and system ID
button to switch to system health mode.
Solid amber Indicates that the system is in fail-safe mode.
Blinking amber Indicates that the system is experiencing a fault. Check the System Event Log for specific
error messages.
Figure 3. Right control panel
1. Power button 2. USB 2.0-compliant port
3. Micro USB 2.0-compliant port for iDRAC Direct 4. iDRAC LED indicator
The iDRAC Direct LED indicator lights up to indicate that the port is connected and is being used as a part of the iDRAC
subsystem. You can configure iDRAC Direct by using a USB to micro USB (type AB) cable, which you can connect to your
laptop or tablet. The following table describes iDRAC Direct activity when the iDRAC Direct port is active:
Table 4. iDRAC Direct LED indicator codes
iDRAC Direct LED indicator
code
Condition
Solid green for two seconds Indicates that the DM5500 is connected.
Flashing green (on for two
seconds and off for two seconds)
Indicates that the DM5500 is connected and is recognized.
Powers off Indicates that the DM5500 is unplugged.
Overview 11

Drive indicator codes
The LEDs on the drive carrier indicates the state of each drive. Each drive carrier in your system has two LEDs: an activity LED
(green) and a status LED (bicolor, green/amber). The activity LED flashes whenever the drive is accessed.
Figure 4. Drive indicators
1. Drive activity LED indicator
2. Drive status LED indicator
3. Drive capacity label
Table 5. Drive indicator codes
Drive status indicator code Condition
Flashes green twice per second Identifying drive or preparing for removal.
Off Drive ready for removal.
NOTE: The drive status indicator remains off until all
drives are initialized after the system is turned on. Drives
are not ready for removal during this time.
Flashes green, amber, and then turns off Predicted drive failure.
Flashes amber four times per second Drive failed.
Flashes green slowly Drive rebuilding.
Solid green Drive online.
Flashes green for three seconds, amber for three seconds,
and then turns off after six seconds
Rebuild stopped.
12 Overview

DM5500 internal view
Drive 0
Drive 1
Drive 2
Drive 3
Drive 4
Drive 5
Drive 6
Drive 7
Drive 8
Drive 9
Drive 10
Drive 11
Drive 12
Drive 13
Drive 14
Drive 15
Drive 16
Drive 17
Drive 18
Drive 19
Drive 20
Drive 21
Drive 22
Drive 23
Figure 5. View of drive bays extended
The DM5500 contains two drive bays, with each drive bay containing 12 slots for a total of 24 slots. There are two drive
configurations available for the DM5500:
●24 TB - DM5500 populated with 14 drives up to a maximum of 24 TB useable capacity
●96 TB - DM5500 populated with 24 drives up to a maximum of 96 TB useable capacity
The following figures and tables show the drive configurations for the two drive setups.
Overview 13

Drive 0
960 GB
Drive 1
960 GB
Drive 2
1.92 TB
Drive 3
Filler
Drive 4
12 TB
Drive 5
12 TB
Drive 6
12 TB
Drive 7
12 TB
Drive 8
12 TB
Drive 9
12 TB
Drive 10
12 TB
Drive 11
12 TB
Boot
drives
Cache
drive
Internal
storage
drives
Drive 12
12 TB
Drive 13
12 TB
Drive bay 1
Drive bay 2
Drive 14
Filler
Drive 15
Filler
Drive 16
Filler
Drive 17
Filler
Drive 18
Filler
Drive 19
Filler
Drive 20
Filler
Drive 21
Filler
Drive 22
Filler
Drive 23
Filler
Figure 6. 24 TB useable capacity DM5500 drive configuration
The 24 TB useable storage capacity drive configuration includes two operating system boot disk drives, one SSD for cache tier,
two 12 TB disk drives for internal system storage, and eight 12 TB disk drives for customer storage capacity.
Drive 0 960 GB SAS SSD - system boot drive
Drive 1 960 GB SAS SSD - system boot drive
Drive 2 1.92 TB cache SSD - internal cache for Protection Storage metadata
Drive 3 Filler - If the you increase the capacity of the DM5500 to more than 24 TB useable capacity, a 3.84 TB cache
SSD is required in slot 3.
Drive 4 12 TB HDD - internal storage
Drive 5 12 TB HDD - internal storage
Drives 6 - 13 12 TB HDD
Drives 14 - 23 Filler - drives 14-23 are 12 TB storage expansion slots that may be used as needed after the initial purchase of
the 24 TB useable capacity DM5500 drive configuration. You can add 12 TB drives in these 10 slots as needed
up to a total maximum of 96 TB useable capacity.
Drive 0
960 GB
Drive 1
960 GB
Drive 2
1.92 TB
Drive 3
3.84 TB
Drive 4
12 TB
Drive 5
12 TB
Drive 6
12 TB
Drive 7
12 TB
Drive 8
12 TB
Drive 9
12 TB
Drive 10
12 TB
Drive 11
12 TB
Boot
drives
Cache
drive
Cache
drive
Internal
storage
drives
Drive 12
12 TB
Drive 13
12 TB
Drive 14
12 TB
Drive 15
12 TB
Drive 16
12 TB
Drive 17
12 TB
Drive 18
12 TB
Drive 19
12 TB
Drive 20
12 TB
Drive 21
12 TB
Drive 22
12 TB
Drive 23
12 TB
Drive bay 1
Drive bay 2
Figure 7. 96 TB useable capacity DM5500 drive configuration
14 Overview

The 96 TB useable storage capacity drive configuration includes two operating system boot disk drives, two SSDs for cache tier,
two 12 TB disk drives for internal system storage, and 18 12 TB disk drives for customer storage capacity.
Drive 0 960 GB SAS SSD - system boot drive
Drive 1 960 GB SAS SSD - system boot drive
Drive 2 1.92 TB cache SSD - internal cache for Protection Storage metadata
Drive 3 3.84 TB cache SSD - internal cache for Protection Storage metadata. Required for DM5500 configurations of 24
TB capacity or more.
Drive 4 12 TB HDD - internal storage
Drive 5 12 TB HDD - internal storage
Drive 6-23 12 TB HDD
DM5500 rear view
Figure 8. DM5500 back panel features
1. Serial port 2. Intel QuickAssist Technology (QAT) card (PCIe slot 2)
3. Dual or quad port expansion card (PCIe slot 3)
Can be configured to run as two 10/25 GbE SFP28 ports,
two 10 GbE SFP+ ports, or four 10GBASE-T ports
4. Dual or quad port expansion card (PCIe slot 4)
Can be configured to run as two 10/25 GbE SFP28 ports,
two 10 GbE SFP+ ports, or four 10GBASE-T ports
5. Filler (unused) PCIe expansion card (PCIe slot 5) 6. Filler (unused) PCIe expansion card (PCIe slot 6)
7. Power supply unit (PSU 1)
PSU 1 can be 1100W or 1600W, but must be the same
wattage as PSU 2.
8. Information tag - this contains the DM5500 serial number.
The pull-out information tag contains a white label with the
14-character DM5500 serial number. The DM5500 serial
number is used as part of the default password when
you log in to the PowerProtect Data Manager Appliance
Configuration UI for the first time when you perform the
initial DM5500 configuration.
9. Power supply unit (PSU 2)
PSU 2 can be 1100W or 1600W, but must be the same
wattage as PSU 1.
10. LAN on motherboard (LOM) ethernet port (2) (PCIe slot 1)
Can be configured to run as 10/25 GbE SFP28, 10 GbE
SFP+, or 10GBASE-T
11. Ethernet port (2)
Gb1 and Gb2 service ports used for initial DM5500 login.
Only one of these ports at a time can be used for the initial
DM5500 login.
12. USB 3.0 port (2)
13. iDRAC9 dedicated network port 14. VGA port
15. System identification button
Overview 15

Hardware and software required for installation
Before installing the DM5500, review the following table to understand the hardware and software requirements for appliance
installation.
Table 6. Hardware and software requirements for DM5500 installation
Component Description
Static rail Included with the DM5500. Designed to work in any data center rack.
Rack Customer supplied. The DM5500 requires 2U.
The DM5500 requires front and rear access for servicing and should be placed in
the rack to accommodate these requirements.
See Install the DM5500 in the rack for more information.
Network switch Customer supplied. One or more. 10 GbE support required. 25 GbE support is
optional.
Switch must support VLAN for external (public) communication. Two network
switches are recommended for redundancy.
The DM5500 requires four ports on the switch (10/25 GbE, optical or copper). A 1
GbE NIC port connection to the Integrated Dell Remote Access Controller (iDRAC)
port is strongly recommended. See Connect network cables and Connect iDRAC
cable for more information.
LC-to-LC multimode fiber (MMF) cables
or direct attach copper twinax network
cables
Supplied at no cost from Dell. The customer is given the choice of including
either LC-to-LC optical cables or direct attach (twinax) cables when ordering the
DM5500.
SFPs If LC-to-LC optical cables are used (instead of twinax cables), 4 x 10/25 GbE SFPs
can be ordered as a kit from Dell. Use the SFPs provided by Dell when connecting
the 4 GbE ports on the DM5500 to the customer network.
SFPs for switches Customer supplied if LC-to-LC optical cables are used.
LC-to-LC optical cables The LC-to-LC optical cables are an option and can be ordered from Dell or can be
customer supplied.
RJ45 iDRAC network cable CAT5e/CAT6 cable for connecting to iDRAC network connection. iDRAC
configuration and cabling provides an out-of-band method for remote management
and may be required for Dell support engineers to debug and troubleshoot.
RJ45 network cables CAT6a/CAT7 cables for connecting the DM5500 10GBASE-T ports to the customer
network. These cables are required if the customer chooses the DM5500
configuration with the quad 10GBASE-T port HBA in slots 3 and 4.
Service computer A service computer is required for initial login. See Assign static IP address to the
service computer for initial DM5500 login.
DNS In the customer data center.
NTP server address The DM5500 requires access to an NTP server for time synchronization.
IP addresses See Collect external network information.
Third-party rack requirements
The DM5500 must be installed in a customer-provided rack that meets the following requirements:
Requirement category Description
Rack The DM5500 fits in a standard rack with a minimum depth of 37 inches (940 mm).
Recommended 24 inches wide rack to provide room for cable routing on the sides of the rack.
16 Overview

Requirement category Description
If you install a front door, it must maintain a minimum of 1.2 inches of clearance to the bezels.
It must be perforated with 50% or more evenly distributed air opening. It should enable easy
access for service personnel and allow the LEDs to be visible through it.
If you install a rear door, it must be perforated with 50% or more evenly distributed air
opening.
Blanking panels should be used as required to prevent air circulation inside the rack.
There is a recommended minimum of 42 inches of clearance in the front and 36 inches of
clearance in the rear of the rack to allow for service area and proper airflow.
Power The customer-provided rack should have redundant power zones with separate PDU power
strips. Each redundant power zone should have capacity for the maximum power load. When
configured this way, the appliance will remain up and running even with the failure of one
power zone.
Use the power calculator to refine the power requirements based on the hardware
configuration and customer-provided PDU.
For customer-provided PDUs, the Dell power cords on the appliance have NEMA 5-15P
connections to the PDUs.
NOTE: Dell is not responsible for any failures, issues, or outages resulting from failure of
the customer-provided PDUs.
Weight Customer rack and data center floor must be capable of supporting the weight of DM5500
equipment. The maximum weight of the DM5500 with all 24 drives installed is 43.2 kg (95.24
lb).
Use the power and weight calculator to refine the weight requirements based on the hardware
configuration and customer-provided rack and PDU.
Overview 17

Install the DM5500 in the rack
Topics:
•Rack rails
•Installing the rails
•Installing the chassis retention brackets
•Unboxing the DM5500 and removing the shipping screws
•Removing drives
•Removing power supply units
•Installing the DM5500 into the rack
•Installing drives
•Installing drive blanks
•Installing power supply units
•Installing the front bezel
Rack rails
The DM5500 supports only static rails. There is no sliding rail option and there are no external cable management options such
as a cable management arm (CMA) or strain relief bar (SRB).
Figure 9. L-Bracket Static rail
The static rails support tool-less mounting in EIA/ECA-310-E compliant square hole and unthreaded round hole 4-post racks.
Table 7. Static rails
Rail
identifie
r
Mounting interface Rail type Supported rack types
4-Post
Square Round Threaded
- Generic Tool-less Static √ √ X
The static rails offer a greater adjustability range and a smaller overall mounting footprint than the sliding rails. This feature is
due to their reduced complexity and lack of need for external cable management (CMA, SRB) support.
Table 8. Static rails adjustability
Rail
Identifier
Rail Type Rail Adjustable Range—mm Rail Depth—mmb
Square Round Threaded Without
CMA/
SRB
With
CMA/
SRB
Min Max Min Max Min Max
- Static 603a917 603a917 N/A N/A N/A N/A
NOTE: a: Minimum conversion required
2
18 Install the DM5500 in the rack

NOTE: b: Rail depth is same as distance between front and rear mounting flanges of the rack. Rails do not support external
cable management (CMA, SRB).
NOTE: The adjustment range of the rails is a function of the type of rack in which they are being mounted. The Min/Max
values listed above represent the allowable distance between the front and rear mounting flanges in the rack.
Installing the rails
Prerequisites
NOTE: The rails can be installed in both square and round hole racks.
NOTE: The support bracket must be removed if the rail cannot fit between the rack flanges.
Figure 10. Installing the rail
1. rack flange
2. release latch (2)
3. support bracket
4. rail peg (4)
To install the rails, perform the following steps.
Steps
1. Press the release latch on the rail.
2. Align the rail with the rack flange, ensuring that the rail pegs are seated in the designed rack holes.
3. Release the latch to lock the rail in place.
The installed rear rack rails should look like the following image.
Install the DM5500 in the rack 19

Installing the chassis retention brackets
Prerequisites
You must install the chassis retention bracket on the two rear rack flanges before you install the DM5500 into the rack.
Figure 11. Chassis retention bracket on rear rack flange
Figure 12. Diagram and description of installing the chassis retention bracket
20 Install the DM5500 in the rack