Blazingly-fast all-flash server aiming for I/O-intensive applications
Synology FlashStation FS6400 is a 2U rackmount server designed for I/O-intensive and latency-sensitive tasks, ideal for multimedia post-production, virtual machines, online transaction processing, or database applications.
CPU - Dual Intel® Xeon® Silver 8-core with NUMA
Memory - DDR4 ECC RDIMM, up to 512GB
High Performance - Over 240,000 iSCSI 4K random write IOPS
Scalability - Up to 72 drives with RX2417sas1
Fast and reliable networking
With multi-LAN design, FS6400 is capable of performing Link Aggregation and failover. For environments requiring a higher speed, two optional Ethernet add-in cards can be installed on PCIe 3.0 slots to provide fast data transmission.
Complete iSCSI and virtualization solutions
Synology iSCSI storage supports most virtualization solutions such as VMware vSphere, Microsoft Hyper-V, Citrix Xen Server, and OpenStack Cinder to enhance work efficiency. You can run and manage multiple virtual machines on Windows, Linux, or DSM using Virtual Machine Manager.
Next-generation file system for better data protection
The Btrfs file system introduces advanced storage technologies and optimized snapshots to prevent data corruption and reduce maintenance overheads. It offers flexible, efficient data protection and recovery tools while ensuring high-level data integrity.
Flexible Shared Folder/User Quota System provides comprehensive quota control on all user accounts and shared folders
Snapshot Replication provides schedulable and storage capacity-saving data protection with 1,024 shared folder backups and 65,000 system-wide snapshots
File- or folder-level data restoration accelerates data recovery and provides more flexibility for businesses
Automatic file self-healing detects and recovers corrupted files without user intervention
Due to the peculiarities of SSD and RAID technology, a common challenge lies in how to prevent all of the drives from failing at the same time because of the evenly distributed workload. RAID F1 alleviates this problem with a specially designed algorithm to unevenly distribute workload to drives, enhancing the resilience of the storage pool and ensuring your data remains safe.
Compared with traditional RAID, RAID F1 distributes uneven workload to SSDs to prevent all drives from wearing out simultaneously.
Digital asset protection
Powered by Synology DiskStation Manager (DSM), Synology NAS offers advanced security measures to protect against sudden data loss and potential security holes.
Analyze system settings, password strength and network preferences, and remove any possible malware.
A kernel-level enhancement that blocks malicious programs from accessing unauthorized system resources.
AES 256-bit encryption
ncrypt shared folders and network data transmission to avoid unauthorized data access.
Prevent others from logging in to your DSM by generating a six-digit one-time password (OTP) on your mobile device.
Customize the trust level in Package Center to avoid installing packages from untrusted sources, safeguarding your NAS from unknown or tampered package files.
As we're committed to improving 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.
Powered by Synology DSM
Synology High Availability
Seamless transition between clustered servers in the event of a server failure to minimize the impact on applications.
Collaborate on documents, spreadsheets, and slides in real time to boost team productivity.
Secure, reliable, and private mail server solution with an intuitive and modern mail client.
Virtual Machine Manager
Run various operating systems in isolated sandboxes. Seamlessly clone, restore and migrate virtual machines.
Comprehensive built-in security tools are constantly updated to protect your devices against evolving threats.
Schedulable and instantaneous data protection for shared folders and iSCSI LUNs for disaster prevention.
FS6400 supports up to two optional expansion units, which can be either two identical RX1217sas/RX2417sas or one of each.
Intel Xeon Silver 4110 x 2
8-Core 2.1 (base) / 3.0 (turbo) GHz
Hardware Encryption Engine (AES-NI)
32 GB DDR4 ECC RDIMM
Memory Module Pre-installed
32 GB (16 GB x 2)
Total Memory Slots
Memory Expandable up to
512 GB (32 GB x 16)
Synology reserves the right to replace memory modules with the same or higher frequency based on supplier's product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance.
Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion.
Maximum Drive Bays with Expansion Unit
48 (RX1217sas) / 72 (RX2417sas)
Compatible Drive Type* (See all supported drives)
2.5" SAS HDD
2.5" SAS SSD
2.5" SATA SSD
Maximum Internal Raw Capacity
184.32 TB (7.68 TB drive x 24) (Capacity may vary by RAID types)
Maximum Raw Capacity with Expansion Units
552.96 TB (184.32 TB + 7.68 TB drive x 48) (Capacity may vary by RAID types)
Maximum Single Volume Size*
200 TB (for RAID 5 or RAID 6 groups only)
Hot Swappable Drive
"Compatible drive type" indicates the drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay.
The maximum raw capacity is not limited by the maximum single volume size. Synology NAS models may utilize capacities over the maximum single volume size as long as each volume created is below the limit.
Each internal volume (may consist of multiple drives) is expandable up to 200TB.
RJ-45 1GbE LAN Port
2 (with Link Aggregation / Failover support)
RJ-45 10GbE LAN Port
2 (with Link Aggregation / Failover support)
USB 3.0 Port
2 x Gen3 x8 slots (x8 link)
PCIe Network Interface Card
exFAT Access is purchased separately in Package Center.
Form Factor (RU)
Size (Height x Width x Depth)
88 mm x 482 mm x 724 mm
Rack Installation Support*
4-post 19" rack (Synology Rail Kit - RKS1317)
The rail kit is sold separately
80 mm x 80 mm x 4 pcs
Fan Speed Mode
Easy Replacement System Fan
Scheduled Power On / Off
Wake on LAN / WAN
Power Supply Unit / Adapter
Redundant Power Supply
AC Input Power Voltage
100 V to 240 V AC
50/60 Hz, Single Phase
288.49 W (Access)
145.8 W (HDD Hibernation)
British Thermal Unit
984.37 BTU/hr (Access)
497.49 BTU/hr (HDD Hibernation)
Power consumption is measured when it's fully loaded with HGST 1.8TB HUC101818CS4204 hard drive(s).
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%
0°C to 35°C (32°F to 95°F)
-20°C to 60°C (-5°F to 140°F)
5% to 95% RH
The warranty period starts from the purchase date as stated on your purchase receipt.
Main Unit X 1
Accessory Pack X 1
AC Power Cord X 2
Quick Installation Guide X 1
D4RD-2666-16G DDR4 ECC RDIMM*
D4RD-2666-32G DDR4 ECC RDIMM
Surveillance Device License Pack
Expansion Unit: RX1217sas X 2
Expansion Unit: RX2417sas X 2
Synology Ethernet Adapter E10G17-F2
Synology Ethernet Adapter E10G18-T1
Synology Ethernet Adapter E10G18-T2
Synology Rail Kit Sliding - RKS1317
It is required to use D4RD-2666-16G with identical memory modules of the same capacity and frequency. For more information, visit here.
Model specifications are subject to change without prior notice.
| Stock code || IBSY-RFS6400|
| Brand || Synology|
| Series || FlashStation NAS|
| Model || FS6400|
| Type || 24-Bay 2.5" 2U SAS/SATA, 2x PSU (no RAIL KIT), 32GB, Xeon Silver, 10GbE|
| ROHS || Y|
| Date added || 08/05/2019|
FS6400 Spec Information
| Platter size || 2.5"|
| RAM/Cache || 32GB DDR4 ECC|
| Guarantee || 5yr|
| Processor || 2x Xeon Silver 4110|
| CPU Mark (cpubenchmark.net) || 2x 10721|
| Total Drives || 24|
| RAID || 0:1:5:6:|
| Rack size || 2|
FS6400 Spec Connections
|USB3||USB3 type A (host)||External||2|
|PCIe||PCIe v3 x8||External||2|
| Speed/RPM || SAS/SATA to 1GbE and 10GbE|
| Weight (kg) || 27kg|
| Weight (bare) || 17.26kg|
| Colour || Black|
Synology FlashStation NAS FS6400 (64GB ECC) 24-Bay 2.5" 2U SAS/SATA, 2x PSU (no RAIL KIT), 64GB, Xeon Silver, 10GbE |
Synology FlashStation NAS FS6400 (128GB ECC) 24-Bay 2.5" 2U SAS/SATA, 2x PSU (no RAIL KIT), 128GB, Xeon Silver, 10GbE |
Synology FlashStation NAS FS6400 (256GB ECC) 24-Bay 2.5" 2U SAS/SATA, 2x PSU (no RAIL KIT), 256GB, Xeon Silver, 10GbE |
Synology FlashStation NAS FS6400 (512GB ECC) 24-Bay 2.5" 2U SAS/SATA, 2x PSU (no RAIL KIT), 512GB, Xeon Silver, 10GbE |
Why People Choose Us?
14 Day Return Guarantee
If you change your mind, you can return all or part of your order.
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Order before 4pm*, and in-stock products will be with you the next day. (Or Saturday. Or even Same Day).
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Our free service helps you choose the right NAS and Drives, then makes sure it is built & ready to use as soon as you get it.
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