Expansion Unit FX2421

Expansion Unit FX2421

On-the-fly storage capacity expansion for Synology FlashStation.

24-bay 2.5" expansion unit for Synology FlashStation

Expand your Synology FlashStation1 with Expansion Unit FX2421 for 24 additional 2.5” drive bays whenever needed. Without additional software configuration, FX2421 is immediately ready for use when connected to Synology FlashStation. FX2421 expansion units can also be used as a dedicated and rapidly accessible local backup destination.

Expand FlashStation with Synology SAT5200 SSD

Synology enterprise-grade SAT5200 SATA SSD, developed in tandem with FX2421, provides proven interoperability and high reliability through rigorous validation and compatibility testing with Synology expansion units. Combine SAT5200 drives with Synology FlashStation and FX2421 for a highly reliable and integrated storage setup, and receive long-term Synology updates and support. Learn more

High-performance data transmission

The high-speed expansion cable provided with FX2421 enables high bandwidth connectivity for maximum data throughput between your Synology FlashStation and Expansion Unit. Drives in FX2421 operate with minimum data latency, as if installed directly on your Synology FlashStation, allowing you to take advantage of high SSD I/O performance.

High-reliability design, easy hardware setup

The FX2421 is a highly reliable and thoroughly tested expansion unit that comes with hot-swappable drive trays and modularized components. Redundant power supplies and system fans can be replaced with ease to ensure maximum service uptime. The optional RKS1317 sliding rail kit provides fast rack fixing lock support for quick and secure rack cabinet installation.

5-year warranty

At Synology, we are committed to product innovation and quality. Synology guarantees a robust and reliable data management experience with a 5-year limited warranty, providing responsive technical support and hardware replacement services to maximize your return on investment.

Notes:

  1. View specifications for a list of supported models.

Hardware Specifications

Applied Models

Applied Models

Supports creating volumes across different units
  • FS series:FS6400, FS3600, FS3400
Notes
  • Expansion Unit FX2421 can only be used with identical expansion units.
  • DSM version requirement: 6.2.3-25426-2 or later version.
  • To have better performance, we recommend creating storage volumes physically located within the same NAS or Expansion Unit, rather than creating volumes across your NAS and Expansion Unit.

Storage

Storage

Drive Bays 24
Compatible Drive Type* (See all supported drives)
  • 2.5" SAS HDD
  • 2.5" SAS SSD
  • 2.5" SATA SSD
Maximum Internal Raw Capacity 92.16 TB (3.84 TB drive x 24) (Capacity may vary by RAID types)
Hot Swappable Drive
RAID Management through Synology DSM
Notes "Compatible drive type" indicates drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay.

External Ports

External Ports

SAS IN-port 1
SAS OUT-port 1

Appearance

Appearance

Size (Height x Width x Depth) 88 mm x 430.5 mm x 692 mm
Size (Height x Width x Depth) (with server ears) 88 mm x 482 mm x 724 mm
Weight 14.5 kg
Rack Installation Support* 4-post 19" rack (Synology Rail Kit - RKS1317)
Notes The rail kit is sold separately

Power

Power

Power Supply Unit / Adapter 500 W
AC Input Power Voltage 100 V to 240 V AC
Power Frequency 50/60 Hz, Single Phase
Power Consumption* 190.99 W (Access)
British Thermal Unit 651.68 BTU/hr (Access)
Redundant Power Supply (for RP model)
Notes Power consumption is measured when it is fully loaded with HGST 1.8TB HUC101818CS4204 hard drive(s).

Temperature

Temperature

Operating Temperature 0°C to 35°C (32°F to 95°F)
Storage Temperature -20°C to 60°C (-5°F to 140°F)
Relative Humidity 5% to 95% RH

Others

Others

System Fan 80 mm x 80 mm x 4 pcs
Easy Replacement System Fan
Noise Level* 57 dB(A)
Notes Noise Level Testing Environment: Fully loaded with Toshiba 600GB AL14SEB060N hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology NAS at the front and rear. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%

Certification

Certification

UL

Warranty

Warranty

5 Years
Notes The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)

Environment & Packaging

Environment

Environment

RoHS Compliant

Packaging Content

Packaging Content

  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Cord X 2
  • Expansion Cable: MiniSAS-HD X 1
  • Quick Installation Guide X 1

Optional Accessories

Optional Accessories

Notes:

  • Model specifications are subject to change without prior notice.
  • The figures are based on Synology internal testing. Each performance test is done individually. No other services or applications are processed at the same time.