Synology FX2421 24-Bay Expansion Unit – FX2421
Description
The Synology FX2421 is a 2U rackmount expansion unit that adds 24 hot-swappable 2.5″ drive bays to Synology FlashStation systems. It connects via a high-speed expansion cable, appearing as native bays with minimal latency, and requires no additional software configuration—ready for on-the-fly volume expansion or dedicated local backup storage upon connection.
Hardware Specifications
| Specification | Details |
|---|---|
| Drive Bays | 24 × hot-swappable 2.5″ SATA SSD/HDD |
| Supported Drive Type | Synology SAT5200 enterprise-grade SATA SSD (validated compatibility) |
| Expansion Interface | High-speed expansion cable (proprietary) |
| Modular Components | Redundant power supplies and system fans |
| Rail Kit Option | RKS1317 sliding rail kit for quick rack installation |
| Form Factor | 2U rackmount |
| Dimensions (H × W × D) | 88 × 430 × 600 mm |
| Weight (without drives) | 18 kg |
| Operating Temperature | 0 °C to 40 °C |
| Storage Temperature | –20 °C to 60 °C |
| Relative Humidity | 5 % to 95 % RH (non-condensing) |
| Warranty | 5-year limited warranty |
Specifications from Synology FX2421 Data Sheet and Synology Expansion Unit FX2421 Datasheet.
Key Features
- On-the-Fly Expansion
Create or expand volumes in DiskStation Manager without powering down or reformatting. - High-Performance Data Transmission
Drives in FX2421 operate as if installed internally, leveraging full SSD I/O throughput. - Enterprise-Grade Reliability
Hot-swappable trays, redundant PSUs, and modular fans ensure maximum uptime. - Plug-and-Play Integration
Instantly detected by DSM upon connection; no additional setup required. - Dedicated Local Backup Destination
Configure FX2421 as a separate backup volume to safeguard critical data. - Synology-Validated Drives
Guaranteed interoperability, performance, and long-term support when used with Synology SSDs.
Compatibility
- Designed exclusively for Synology FlashStation 1 series (DSM 6.2.3-25426-2 or later).
- Expansion units must be identical models; FX2421 can only daisy-chain with other FX2421 units for optimal performance.
- Synology recommends locating volumes within the same chassis or expansion unit to maximize throughput and stability.
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