24-bay 2U all-flash storage server
Synology FlashStation FS6400 24-Bay All-Flash Server
The Synology FlashStation FS6400 is a 24-bay 2U storage server for latency-sensitive and I/O-intensive workloads, with dual Intel Xeon Silver processors, 32 GB DDR4 ECC memory and built-in 10GbE connectivity.
- Processor
- 2 × Intel Xeon Silver 4110
- Memory
- 32 GB DDR4 ECC RDIMM
- Drive bays
- 24 / up to 72
- Networking
- 2 × 10GbE + 2 × 1GbE
Serve demanding flash workloads from a scalable 2U platform
The FS6400 combines 24 hot-swappable 2.5-inch bays with dual processors, a 512 GB memory ceiling, redundant power and two PCIe slots. Two FX2421 expansion units extend the system to 72 drives for organisations building high-performance virtualisation, database or media-production storage.
Twenty-four flash bays
Deploy compatible 2.5-inch SAS HDDs, SAS SSDs or SATA SSDs in a hot-swappable 2U system.
Dual Xeon processors
Two Intel Xeon Silver 4110 processors provide 8 cores and 16 threads per CPU.
Large ECC memory capacity
Start with 32 GB DDR4 ECC RDIMM and expand to 512 GB across 16 slots.
Built-in dual 10GbE
Two 10GbE and two 1GbE ports provide fast connectivity without consuming PCIe slots.
Scale to 72 drives
Connect two identical FX2421 expansion units to increase the verified drive count.
Resilient rack hardware
Redundant power and replaceable system fans support service-continuity planning.
Who is the Synology FS6400 best for?
A strong choice for
- All-flash virtualisation storage
- Database and transaction workloads
- Media post-production teams
- Large flash-based file services
- Organisations needing up to 72 drives
Consider another model if you need
- You require a compact desktop NAS
- Your workload does not justify a 2U all-flash platform
- You need more than 72 drives
- You need a newer platform generation for a greenfield deployment
Key specifications
- Model
- FS6400
- Product type
- 24-bay 2U all-flash storage server
- Processors
- 2 × Intel Xeon Silver 4110
- CPU frequency
- 2.1 GHz base / 3.0 GHz turbo
- System memory
- 32 GB DDR4 ECC RDIMM
- Maximum memory
- 512 GB (32 GB × 16)
- Drive bays
- 24; up to 72 with FX2421 × 2
- Drive types
- 2.5-inch SAS HDD/SSD or SATA SSD
- Built-in network
- 2 × 10GbE and 2 × 1GbE
- PCIe expansion
- 2 × Gen3 x8 slots (x8 link)
- Dimensions
- 88 × 482 × 724 mm
- Warranty
- 5 years
Full technical specifications
Processor and memory
| CPU model | Intel Xeon Silver 4110 |
|---|---|
| CPU quantity | 2 |
| CPU cores | 8 per processor |
| CPU threads | 16 per processor |
| CPU architecture | 64-bit |
| CPU frequency | 2.1 GHz base / 3.0 GHz turbo |
| Hardware encryption engine | Supported |
| System memory | 32 GB DDR4 ECC RDIMM |
| Pre-installed memory | 32 GB (16 GB × 2) |
| Total memory slots | 16 |
| Maximum memory | 512 GB (32 GB × 16) |
| Memory guidance | Use identical Synology modules and follow the exact-model manual |
Storage, network and expansion
| Drive bays | 24 |
|---|---|
| Maximum drive bays | 72 (FX2421 × 2) |
| Drive categories | 2.5-inch SAS HDD, 2.5-inch SAS SSD or 2.5-inch SATA SSD |
| Hot-swappable drives | Supported |
| RJ-45 1GbE ports | 2 |
| RJ-45 10GbE ports | 2 |
| USB ports | 2 × USB 3.2 Gen 1 |
| Expansion ports | 1 × Mini-SAS HD |
| PCIe expansion | 2 × Gen3 x8 slots (x8 link) |
| Expansion guidance | FX2421 expansion units must be used as an identical pair |
| Drive compatibility | Confirm exact drives on Synology’s FS6400 compatibility list |
Physical design and power
| Form factor | 2U |
|---|---|
| Size (H × W × D) | 88 × 482 × 724 mm |
| Weight | 17.26 kg |
| Rack support | 4-post 19-inch rack; RKS-02 sold separately |
| System fans | 80 × 80 mm × 4 |
| Fan modes | Full-speed, cool and quiet |
| Replaceable system fans | Supported |
| Noise level | 53.7 dB(A) |
| Power recovery | Supported |
| Scheduled power on/off | Supported |
| Wake on LAN/WAN | Supported |
| Power supply | 800 W |
| Redundant power | Supported |
| AC input | 100 V to 240 V AC |
| Power consumption | 288.49 W access; 145.8 W HDD hibernation |
| Thermal output | 984.37 BTU/hr access; 497.49 BTU/hr HDD hibernation |
Environment, warranty and package
| Operating temperature | 0°C to 35°C |
|---|---|
| Storage temperature | -20°C to 60°C |
| Operating humidity | 8% to 80% RH |
| Storage humidity | 5% to 95% RH |
| Certifications | FCC, CE, BSMI, VCCI, RCM, UKCA, EAC, CCC, KC, BIS |
| Environment | RoHS compliant |
| Warranty | 5 years |
| Package contents | Main unit × 1; accessory pack × 1; AC power cord × 2; quick installation guide × 1 |
| Rail kit | RKS-02 sold separately |
Frequently asked questions about the Synology FS6400
What is the Synology FS6400?
The Synology FS6400 is a 24-bay 2U all-flash storage server for I/O-intensive and latency-sensitive business workloads.
Which processors are in the FS6400?
It uses two Intel Xeon Silver 4110 processors, each specified with 8 cores, 16 threads and a 2.1 GHz base / 3.0 GHz turbo frequency.
How much memory does the FS6400 include?
It includes 32 GB DDR4 ECC RDIMM and supports up to 512 GB across 16 memory slots.
How many drive bays does the FS6400 have?
The FS6400 has 24 hot-swappable bays and expands to 72 drives with two identical FX2421 units.
Which drive categories does the FS6400 support?
Synology lists 2.5-inch SAS HDDs, SAS SSDs and SATA SSDs. Confirm exact models on the compatibility list.
What network ports are built into the FS6400?
The FS6400 includes two 10GbE RJ-45 ports and two 1GbE RJ-45 ports.
What PCIe expansion does the FS6400 provide?
It provides two Gen3 x8 slots with x8 links for compatible add-in cards.
Does the FS6400 have redundant power?
Yes. Synology specifies an 800 W redundant power supply system.
What are the FS6400 dimensions?
The 2U chassis measures 88 × 482 × 724 mm and weighs 17.26 kg.
What warranty applies to the FS6400?
Synology specifies a 5-year warranty beginning from the purchase date shown on the receipt.
- Storage drives and the RKS-02 rail kit are sold separately.
- Use only drives, memory and add-in cards listed for the exact FS6400.
- FX2421 expansion units must be deployed as an identical pair for this model.
- Actual performance depends on drive, RAID, network and workload configuration.
