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Black 2U rackmount chassis with 24 front 2.5-inch drive bays and status LEDs

Synology Inc.

Synology FX2421 24-bay 2.5" SAS/SATA rackmount NAS

SKU CH-S50N-02X7F MPN FX2421

A 2U rackmount expansion unit that adds 24 hot-swap 2.5" SAS or SATA drive bays to a Synology FlashStation via high-speed SAS cabling

  • Form factor2U
  • Port others1 x SAS IN 1 x SAS OUT
  • Drive interface24 × 2.5 in SAS SSD/HDD or SATA SSD (drives not included)
  • Indicator lightsPower indicator Drive status indicator Status indicator Aler
  • Power details100 V to 240 V AC, 50/60 Hz, single phase
  • Temperature rangeOperating temperature: 0 °C to 35 °C (32 °F to 95 °F) Storag
  • 24 drive bays expand FlashStation capacity instantly
  • 5" SAS and SATA SSDs supported for flexible media choice
  • 2U rackmount form factor fits standard server cabinets
  • High-speed SAS expansion cable enables rapid data throughput
  • Validated with Synology SAT5200 enterprise SSDs for proven reliability

24-bay 2.5" SAS/SATA expansion unit

The Synology FX2421 is a 2U rackmount expansion unit that adds 24 additional 2.5-inch drive bays to a compatible Synology FlashStation. It connects via the supplied high-speed expansion cable using SAS IN and SAS OUT ports for online volume expansion without downtime. Drives are not included and the unit supports SAS SSDs, SAS HDDs and SATA SSDs for flexible deployment.

Suits FlashStation owners needing dense capacity

Organisations that already run a Synology FlashStation and require immediate, high-density storage growth will benefit from the 24 hot-swappable bays and seamless expansion. Buyers without a compatible FlashStation cannot use this unit as a standalone NAS and should look at a complete rackmount system instead.

SAS expansion connectivity decides fit

The single specification that determines compatibility is the SAS expansion interface: the FX2421 must be cabled to a FlashStation that provides a matching SAS expansion port, so verify that your existing FlashStation model supports SAS-based capacity expansion before purchase.

How it compares

Measured against everything we stock in Rack-Mounted NAS Servers, at today’s prices. Recalculated every night.

Price $3,096.99
Cheaper than about 85% of the 763 comparable items (median $6,564.99).

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Specifications

Product
Brand nameSynology
Model nameFX2421
Recommended useUltra high prerformance for large number of users
Storage
Drive interface24 × 2.5 in SAS SSD/HDD or SATA SSD (drives not included)
Ports & slots
Port others1 x SAS IN
1 x SAS OUT
Power
Power details100 V to 240 V AC, 50/60 Hz, single phase
Size & build
Form factor2U
Product dimensions3.46 in × 16.95 in × 27.24 in
3.46 in × 18.98 in × 28.5 in (with server ears)
Product weight31.97 lb (14.5 kg)
Shipping weight19.78 kg
Package size921 × 692 × 248 mm
In the box
In the box1 x FX2421 main unit
1 x Quick Installation Guide
1 x Accessory pack
2 x AC power cord
1 x Expansion cable
Environment & compliance
Temperature rangeOperating temperature: 0 °C to 35 °C (32 °F to 95 °F)
Storage temperature: -20 °C to 60 °C (-5 °F to 140 °F)
Humidity range5% to 95% RH
More details
Indicator lightsPower indicator
Drive status indicator
Status indicator
Alert indicator
Expansion unit ID indicator
SAS IN port and indicator
SAS OUT port and indicator

Questions about this item

How much heat does the 24-bay FX2421 add when it runs all day in a 2U rack?

The unit operates from 0 °C to 35 °C and stores from -20 °C to 60 °C, with humidity rated 5 % to 95 % RH.

Which host system must I already own for the FX2421 to function?

It expands a Synology FlashStation via the included high-speed expansion cable and SAS IN port.

Will my existing 2.5" SAS or SATA SSDs work in the FX2421 alongside older drives?

The 24 bays accept 2.5" SAS SSD/HDD or SATA SSD, and the unit is validated with Synology SAT5200 SATA SSDs for proven interoperability.

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