CPU

CPU

Dual Intel® Xeon® Silver 8-core with NUMA

Memory

Memory

DDR4 ECC RDIMM, up to 512GB

High Performance

High Performance

Over 240,000 iSCSI 4K random write IOPS

Scalability

Scalability

Up to 72 drives with FX24211

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.

Fast and reliable networking
vmware
windows2016
citrix
openstack
Next-generation file system for better data protection
RAID F1
Compared with traditional RAID, RAID F1 distributes uneven workload to SSDs to prevent all drives from wearing out simultaneously.
Digital asset protection
5-year warranty

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.

Synology Replacement Service (SRS)

Synology Replacement Service (SRS)

SRS provides free advance replacement units as early as the next business day in selected regions, maximizing the service uptime for your mission-critical storage and ensuring your business continuity.Check service availability here.

Powered by Synology DiskStation Manager

product FS6400 front view photo
product FS6400 back view photo
  • 1Power button and indicator
  • 2Beep off button
  • 3Drive tray
  • 4Drive status indicator
  • 5PSU fan
  • 6Power port
  • 7PSU indicator
  • 8Console port
  • 9Reset button
  • 101GbE RJ-45 port
  • 1110GbE RJ-45 (10GBASE-T) port
  • 12USB 3.0 port
  • 13PCIe expansion slot
  • 14Expansion port

Notes:

  1. FS6400 supports up to two optional expansion units, which can be either two identical RX1217sas/FX2421 or one of each.

Hardware Specifications

CPU

CPU

CPU Model Intel Xeon Silver 4110
CPU Quantity 2
CPU Architecture 64-bit
CPU Frequency 8-core 2.1 (base) / 3.0 (turbo) GHz
Hardware Encryption Engine (AES-NI)

Memory

Memory

System Memory 32 GB DDR4 ECC RDIMM
Memory Module Pre-installed 32 GB (16 GB x 2)
Total Memory Slots 16
Maximum Memory Capacity 512 GB (32 GB x 16)
Notes
  • 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.
  • For more information on the recommended memory configurations, visit here.
  • 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.

Storage

Storage

Drive Bays 24
Maximum Drive Bays with Expansion Unit 48 (RX1217sas x 2) / 72 (FX2421* x 2)
Compatible Drive Type* (See all supported drives)
  • 2.5" SAS HDD
  • 2.5" SAS SSD
  • 2.5" SATA SSD
Maximum Single Volume Size* 200 TB
Hot Swappable Drive
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.
  • Each internal volume (may consist of multiple drives) is expandable up to 200TB.

External Ports

External Ports

RJ-45 1GbE LAN Port 2 (with Link Aggregation / Failover support)
RJ-45 10GbE LAN Port 2 (with Link Aggregation / Failover support)
USB 3.2 Gen 1 Port* 2
Expansion Port 1
Notes The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019.

PCIe

PCIe

PCIe Expansion 2 x Gen3 x8 slots (x8 link)

File System

File System

Internal Drives
  • Btrfs
  • EXT4
External Drives
  • Btrfs
  • EXT4
  • EXT3
  • FAT
  • NTFS
  • HFS+
  • exFAT*
Notes exFAT Access is purchased separately in Package Center.

Appearance

Appearance

Form Factor (RU) 2U
Size (Height x Width x Depth) 88 mm x 482 mm x 724 mm
Weight 17.26 kg
Rack Installation Support* 4-post 19" rack (Synology Rail Kit - RKS1317)
Notes The rail kit is sold separately

Others

Others

System Fan 80 mm x 80 mm x 4 pcs
Fan Speed Mode
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
Easy Replacement System Fan
Power Recovery
Noise Level* 53.7 dB(A)
Scheduled Power On / Off
Wake on LAN / WAN
Power Supply Unit / Adapter 800 W
Redundant Power Supply
AC Input Power Voltage 100 V to 240 V AC
Power Frequency 50/60 Hz, Single Phase
Power Consumption* 288.49 W (Access)
145.8 W (HDD Hibernation)
British Thermal Unit 984.37 BTU/hr (Access)
497.49 BTU/hr (HDD Hibernation)
Notes
  • Power consumption is measured when it is 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%

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

Certification

Certification

  • FCC
  • CE
  • BSMI
  • EAC
  • KC
  • VCCI
  • RCM

Warranty

Warranty

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

Environment

Environment

RoHS Compliant

Packaging Content

Packaging Content

  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Cord X 2
  • Quick Installation Guide X 1

Optional Accessories

Optional Accessories

Notes
  • It is required to use D4RD-2666-16G with identical memory modules of the same capacity and frequency. For more information, visit here.
  • Expansion Unit FX2421 can only be used with identical expansion units.

DSM Specifications

Storage Management

Storage Management

Maximum Internal Volume Number 256
SSD Read / Write Cache (White Paper)
SSD TRIM
RAID Group
Supported RAID Type
  • RAID F1
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
RAID Migration
  • Basic to RAID 1
  • Basic to RAID 5
  • RAID 1 to RAID 5
  • RAID 5 to RAID 6
Volume Expansion with Larger HDDs
  • RAID F1
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
Volume Expansion by Adding a HDD
  • RAID F1
  • JBOD
  • RAID 5
  • RAID 6
Global Hot Spare Supported RAID Type
  • RAID F1
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10

File Services

File Services

File Protocol SMB/AFP/NFS/FTP/WebDAV
Maximum Concurrent SMB/AFP/FTP Connections 8,000
Maximum Concurrent SMB/AFP/FTP Connections (with RAM expansion) 10,000
Windows Access Control List (ACL) Integration
NFS Kerberos Authentication
Notes
  • Regarding data concerning tests with RAM expansion, all memory slots are installed with the maximum capacity of supported RAM.
  • During testing, the maximum number of SSDs supported by this model is installed in a RAID 5 configuration.
  • The testing standard was based on the maximum number of concurrent connections supported by this model. During the testing, 25% of the connections were used to transfer files concurrently. The transfer process guaranteed that the connections were not interrupted; the minimum transfer speed was not guaranteed.

Account & Shared Folder

Account & Shared Folder

Maximum Local User Accounts 16,000
Maximum Local Groups 512
Maximum Shared Folder 512
Maximum Shared Folder Sync Tasks 32

High Availability

High Availability

Synology High Availability

Log Center

Log Center

Syslog Events per Second 3,000

Virtualization

Virtualization

VMware vSphere with VAAI
Windows Server 2016
Windows Server 2019
Citrix Ready
OpenStack

General Specifications

General Specifications

Networking Protocols SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
Supported Browsers
  • Google Chrome
  • Firefox
  • Microsoft Edge
  • Internet Explorer
  • Safari
Supported Language English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文
Notes For an updated list of supported browser versions, check the DSM Technical Specifications.

Add-on Packages view the complete package list

Antivirus by McAfee (Trial)

Antivirus by McAfee (Trial)

Central Management System

Central Management System

Synology Chat

Synology Chat

Maximum Users 6,000
Notes
  • The number of concurrent HTTP connections for Synology Chat was configured to the maximum.
  • For tested models with expandable memory, the maximum amount of RAM was installed.

Document Viewer

Document Viewer

exFAT Access (Optional)

exFAT Access (Optional)

iSCSI Manager

iSCSI Manager

Maximum iSCSI Target Number 256
Maximum iSCSI LUN 512
iSCSI LUN Clone/Snapshot, Windows ODX

Synology MailPlus / MailPlus Server

Synology MailPlus / MailPlus Server

Free Email Accounts 5 (Licenses required for additional accounts)
Maximum Number of Concurrent Users 2,200
Maximum Server Performance 5,721,000 emails per day, approx. 174GB
Notes
  • FS series were installed with 12 SSDs in RAID F1 configuration.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
  • The performance of the mail system will slightly decrease in high-availability mode due to data synchronization between the two servers.
  • Functions that were enabled in all of the tests above: anti-spam, anti-virus, DNSBL, greylist, content scan, full-text search (English only).

Snapshot Replication

Snapshot Replication

Maximum Snapshots per Shared Folder 1,024
Maximum of System Snapshots 65,536

Surveillance Station

Surveillance Station

Maximum IP cam (Licenses required) 150 (including 2 Free License) (See All Supported IP Cameras)
Total FPS (H.264) 4500 FPS @ 720p (1280x720)
4500 FPS @ 1080p (1920x1080)
4500 FPS @ 3M (2048x1536)
3300 FPS @ 5M (2591x1944)
2100 FPS @ 4K (3840x2160)
Total FPS (H.265) 4500 FPS @ 720p (1280x720)
4500 FPS @ 1080p (1920x1080)
4500 FPS @ 3M (2048x1536)
4500 FPS @ 5M (2591x1944)
4500 FPS @ 4K (3840x2160)
Notes
  • Surveillance Station throughput is tested with Axis network camera, using continuous recording with live view from Surveillance Station and motion detection by camera. Live view and recording are sharing the same stream from the camera.
  • The maximum channel number also includes devices installed on Virtual DSM.
  • Total FPS may be affected by other services running at the same time (e.g., archive tasks performed by Archive Vault).

Synology Drive

Synology Drive

Recommended Number of Hosted Files 100,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)
Recommended Number of Concurrent Sync Clients 2,000 (the number of connections that can be maintained when the recommended number of hosted files was reached)
Notes
  • Exceeding the recommended numbers above will not block application operations, but may result in longer response time.
  • Utilizing SSD cache can significantly improve performance.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
  • Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.

Synology Office

Synology Office

Maximum Users 3,400
Notes
  • Multiple files were opened for testing and each file was edited by 30 users simultaneously.
  • For tested models with expandable memory, the maximum amount of RAM was installed.
  • Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM

Virtual Machine Manager

Virtual Machine Manager

Recommended Virtual Machine Instances 32 (Learn more)
Recommended Virtual DSM Number (Licenses required) 32 (including 1 Free License)
Notes The specifications vary depending on system configuration and memory size.

VPN Server

VPN Server

Maximum Connections 40

Notes:

  1. Model specifications are subject to change without prior notice.
  2. 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.
  3. The actual performance may be lower than lab testing figure due to differences in server configuration, deployment, and the number of active operations.
  4. If usage requirements exceed the specifications above, please contact our regional partners for professional advice.