Synology FX2421 Manual

Expansion Unit FX2421
Hardware Installation Guide

Table of Contents
Chapter 1: Before You Start
Package Contents 3
Synology FX2421 at a Glance 4
LED Indicator Table 6
Hardware Specication 7
Optional Accessories 8
Spare Parts 8
Safety Instructions 9
Chapter 2: Hardware Setup
Tools and Parts for Component Installation 10
Install Drives 10
Install and Remove Rail Kits 12
Connect with Synology NAS 14
Chapter 3: System Maintenance
Replace System Fan 16
Replace Power Supply Unit (PSU) 17
Initial Troubleshooting Guide 17
Synology_HIG_FX2421_20200511
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Thank you for purchasing Synology FX2421 expansion unit! Before setting up your new expansion unit, please
check the package contents to verify that you have received the items below. Also, make sure to read the safety
instructions carefully to avoid harming yourself or damaging your expansion unit.
Note: All images below are for illustrative purposes only, and may di󰀨er from the actual product.
Package Contents
Main unit x 1 AC power cord x 2
Screws for 2.5" drives x 100
Expansion cable x 1
Before You Start 1
Chapter
3
3

4Chapter 1: Before You Start
Synology FX2421 at a Glance
5
1
8
1310 12
9
1411
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4
2 3
6 6
No. Article Name Location Description
1 Power Indicator
Front
Displays the power status.1
2 Alert Indicator Displays warnings regarding fan or temperature. For more
information, please see "LED Indicator Table".
3 Beep O󰀨 Button Press to deactivate the beep that sounds when a malfunction
occurs.
4 Drive Status Indicators Displays the status of drives. For more information, please
see "LED Indicator Table".
5 Drive Tray Install drives (hard disk drives or solid state drives) here.
6 Rail Kit Release Tab Push in and hold to release your FX2421 from the rail kit
lock.2
1FX2421 automatically powers on when the power cord is plugged into the power source. For more information, please see "Connect with Synology NAS".
2For more information about the rail kit installation, please refer to the Quick Installation Guide that comes with the rail kit.

5Chapter 1: Before You Start
No. Article Name Location Description
7 Power Port
Back
Connect power cords here.
8 PSU Indicator and Beep
O󰀨 Button
1. Displays the status of the power supply unit (PSU). For
more information, see "LED Indicator Table".
2. Press to deactivate the beep that sounds when a
malfunction occurs.
9 PSU Fan Disposes of excess heat and cools the PSU.
10 Status Indicator Displays the status of the system. For more information,
please see "LED Indicator Table".
11 Alert Indicator Displays warnings regarding fan or temperature. For more
information, please see "LED Indicator Table".
12 Expansion Unit ID
Indicator Indicates the ID number of the expansion unit.
13 SAS IN Port and
Indicator
Connects to the SAS OUT port of a Synology NAS or another
expansion unit. For more information, please see "Connect
with Synology NAS".
14 SAS OUT Port and
Indicator
Connects to the SAS IN port of another expansion unit. For
more information, please see "Connect with Synology NAS".

6Chapter 1: Before You Start
LED Indicator Table
LED Indicator Color Status Description
Power
Blue Static Powered on
O󰀨 Powered o󰀨
Front ALERT
Orange Blinking Fan failure/Over temperature
O󰀨 System normal
Drive Status Indicator
(on tray)
Green
Static Drive ready and idle
Blinking Accessing drive
Red Static Drive error/Port disabled1
O󰀨 No internal drive
Rear ALERT
Orange Blinking Fan failure/Over temperature
O󰀨 System normal
Rear STATUS
Green Blinking Powered on
O󰀨 Powered o󰀨
PSU Indicator
Green Static Power supply unit normal
O󰀨 Power supply unit o󰀨
SAS IN/OUT
Green Static Synology NAS connected
O󰀨 Synology NAS disconnected
Note: Model specications are subject to change without notice. Please refer to www.synology.com for the latest information.
1Please try to restart your Synology NAS or re-insert the drives, then run the HDD/SSD manufacturer's diagnostic tool to check the health status
of the drives. If you can sign in to DSM, please run the built-in S.M.A.R.T. test to scan the drives. If the problem remains unresolved, please
contact Synology Technical Support for help.

7Chapter 1: Before You Start
Hardware Specication
Item FX2421
Compatible Drive Type 2.5" SAS/SATA x 24
Maximum Internal Raw
Capacity 92.16 TB (24 x 3.84 TB SSD)
Expansion Port • SAS IN x 1
• SAS OUT x 1
Size (H x W x D) (mm) • 88 x 430.5 x 692
• 88 x 482 x 724 (with server ears)
Weight (kg) 14.5
Agency Certication • FCC Class A • CE Class A • BSMI Class A
• EAC • VCCI • RCM
Environment
Requirements
• Line voltage: 100 V to 240 V AC
• Frequency: 50 / 60 Hz
• Operating Temperature: 32 to 95˚F (0 to 35˚C)
• Storage Temperature: -5 to 140˚F (-20 to 60˚C)
• Relative Humidity: 5% to 95% RH
Note: Model specications are subject to change without notice. Please refer to www.synology.com for the latest information.

8Chapter 1: Before You Start
Optional Accessories
With Synology accessories, you can customize your expansion unit to t di󰀨erent business environments without
worrying about compatibility and stability. Visit www.synology.com/compatibility for more information.
• Rail Kit
Model Name Picture Description
RKS1317 Sliding rails solutions
Spare Parts
• Visit www.synology.com/products/spare_parts if you need to replace system fans, disk trays, or power
supply units
Model Name Picture Description
Cable MiniSASHD_EXT_1 External MiniSAS HD Cable
Disk Tray (Type R1) 2.5" Drive Tray
FAN 80*80*32_6 System Fan 80*80*32 mm
PSU 500W-RP Module_2 Redundant PSU Module 500W
PSU 500W-RP SET_2 Redundant PSU Set 500W

9Chapter 1: Before You Start
Safety Instructions
Keep away from direct sunlight and away from chemicals. Make sure the environment
does not experience abrupt changes in temperature or humidity.
Place the product right side up at all times.
Do not place near any liquids.
Before cleaning, unplug the power cord. Wipe with damp paper towels. Do not use
chemical or aerosol cleaners.
To prevent the unit from falling over, do not place on carts or any unstable surfaces.
The power cord must plug in to the correct supply voltage. Make sure that the supplied
AC voltage is correct and stable.
To remove all electrical current from the device, ensure that all power cords are
disconnected from the power source.
Risk of explosion if battery is replaced with an incorrect type. Dispose of used batteries
appropriately.

Tools and Parts for Component Installation
Please prepare the tools and parts below before setting up your expansion unit:
• A Screwdriver
• At least one 2.5" SAS/SATA drive (please visit www.synology.com/compatibility for compatible drive
models).
Warning: If you install a drive that contains data, the system will format the drive and erase all existing data.
Please back up any important data before installation.
• Rail mounting kit (please see the Optional Accessories section to nd suitable rail kits for cabinet installation)
Warning: We suggest mounting your expansion unit on a cabinet before installing any drives since the heavy
weight will increase the installation di󰀩culty.
Install Drives
Please follow below steps for drive installation:
1 Open the drive tray.
a Find the small button located at the bottom side of the drive tray handle. Press the button down, and the
drive tray handle will pop out.
b Pull the drive tray handle out as illustrated above.
2 Place the drive in the drive tray. Tighten the screws provided to secure the drive in place.
3 Insert the loaded drive tray into the empty drive bay.
Note: Make sure the tray is pushed in all the way. Otherwise, the drive might not be able to function properly.
Hardware Setup
10
2
Chapter