Handle growing data storage demands with ease



Up to 1.9 PB with 8 x RX1223RP expansion units



Over 6,500/4,000 MB/s sequential read/write1



Optional 25/40GbE or Fibre Channel connectivity

On-demand storage expansion

The SA6400 scales up flexibly whenever your data demands do. Accommodate up to 9 times the original capacity by adding 12-bay RX1223RP expansion units as your deployment grows.

Over10,000/6,200 MB/sread/write after expansion2

Up to8expansion units

RX1223RP unitsdirectly connectto SA6400

On-demand storage expansion

Built for high reliability

The SA6400 is designed with built-in redundancies to keep mission-critical services running, even when disaster strikes.

Out-of-band (OOB) management
Redundant power supply

Advanced networking options

The SA6400 has the flexibility to accommodate different operating environments.

Built-in fast connectivity

Two 10GbE RJ-45 ports provide rapid transfer speeds right out of the box.

Configurable networking options

Add up to 2 extra 10GbE SFP+/RJ-45, 25GbE SFP28, or Fibre Channel ports in varying configurations.3

Failover and network balancing

Bond multiple network interfaces with Link Aggregation to enable automatic network failover and load balancing.

Advanced networking options

Versatile data storage and business application platform

Provide easy access to business data, consolidate digital assets, or host cost-efficient business solutions.

Flexible file server

Flexible file server

Flexible file server
Central backup server

Central backup server

Central backup server
Business application platform

Business application platform

Business application platform

Flexible file server

Take advantage of the SA6400’s high storage capacity and expansion capability to host large amounts of data on a central repository. Provide user-friendly access to business data and set up powerful cross-site syncing to empower remote and multi-site collaboration.

A private cloud suite for file sharing

Empower your entire organization with a streamlined ability to access, share, and sync data from anywhere. Provide employees with access to corporate files through mobile apps, desktop clients, and a browser-based interface. Set granular file and folder access and sharing permissions. Maintain a full overview of file activities and track file share settings changes with detailed records in the Synology Drive Admin Console. Learn more

SMB/NFS implementation at scale

Leverage SMB or NFS protocols to provide efficient access to company files over the local network or VPN. Manage data access privileges with access control lists (ACL) through Active Directory/LDAP integration and protect files against tampering, loss, or removal with built-in snapshot technology.

Private cloud

Secure site-to site file and folder syncing

Make sure branches always have up-to-date copies of crucial documents and data available locally by syncing Synology systems one or two-way using Synology Drive ShareSync. Have files updated across locations each time there is a change to efficiently keep all stakeholders on the same page. Learn more

Efficient cross-site syncing through the cloud

Boost syncing speeds, cut bandwidth use, and reduce your storage footprint by leveraging the powerful connectivity of our data centers. Synology Hybrid Share intelligently synchronizes data to Synology devices.4 Large or less frequently accessed files are stored on the cloud to reduce local storage requirements, while frequently used files are stored on local devices to provide users access at LAN speeds. Learn more

Cross-site syncing

Central backup server

Back up PCs, servers, Synology systems, SaaS data, and VMs, and back up your backup servers themselves with a scalable central storage solution.

Bare-metal PC, server, and VM backup

Securely back up Windows clients and servers, Linux endpoints, Synology systems, and VMware® and Hyper-V® virtual machines to the SA6400 with Active Backup for Business. Manage them through a centralized management console and choose between bare-metal or file-level restoration. Built-in data deduplication maximizes storage efficiency. Learn more

SaaS protection with local backups

Protect Microsoft 365 and Google Workspace accounts by maintaining complete offline copies of your crucial information and configurations with Active Backup for Microsoft 365 and Active Backup for Google Workspace.

Back up Windows and Linux endpoints

Backup destination for shares and LUNs

Use Hyper Backup to back up files, LUNs, installed applications, and system configurations from tens or hundreds of Synology servers to your SA6400. Set and forget backup tasks with regular schedules, enhance security with fine-grained user permissions and encryption, reduce backup sizes with built-in deduplication, and restore data flexibly with multi-versioning. Learn more

Snapshot Replication enables configurable point-in-time snapshots of shared folders and LUNs with an RPO as low as 5 minutes and recovery within seconds. Learn more

Bare-metal backup for Synology systems

Manage bare-metal backups of all your Synology servers from a single centralized console on the SA6400. Leverage built-in deduplication technology to reduce backup sizes while multi-versioning provides flexible restoration options.

Back up Synology storage systems

Business application platform

Host cost-efficient business solutions, either through containers, virtual machines, or Synology DiskStation (DSM)’s own solutions, including a powerful free backup suite, a versatile mail server, and a surveillance VMS with transparent licensing.

Collaboration in a secure cloud

Create and edit documents, spreadsheets, and slides together with your whole team in real time. Easily migrate existing documents from other platforms and take ownership of your files in a secure private cloud. Learn more

Synology’s private cloud mail solution provides ease of use, full data ownership, and robust data security with a low total cost of ownership thanks to its subscription-free licensing model. Learn more

Keep teams connected through encrypted one-on-one private chats, public channels, and group conversations. Efficiently organize discussions with bookmarks, searchable hashtags, and chatbots. Learn more

Synology productivity solutions

Application test environment

Run Docker containers and VMs on SA6400 using Docker and Synology Virtual Machine Manager (VMM)5 — a hypervisor for virtualized versions of Windows®, Linux®, and DSM — to safely test and evaluate applications.

Virtual DSM serves as a test environment for package updates or to add an additional layer of security between applications, systems, and data. Learn more

Containerization and virtualization-ready

Centralized monitoring and management

Stay on top of your fleet and keep it in optimal condition with our cloud and DSM-based monitoring and management solutions.

Central Management System (CMS)

Central Management System (CMS)

Conveniently manage your fleet of Synology systems from a centralized console.

Learn more

Active Insight

Active Insight

A powerful cloud-based platform for monitoring performance, backup status, login activity and performing lightweight management tasks.

Learn more

Synology has you covered

Synology has you covered

The SA6400 is backed by Synology's 5-year limited warranty,6 including technical support and hardware replacement services to maximize your return on investment and ensure continued high-quality performance. Learn more

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. Learn more

Performance backed by Synology drives

Engineered to handle intensive 24/7 workloads, Synology drives consistently deliver top-grade performance.

img enterprise-hatimg enterprise-satimg enterprise-snv3500


productSA6400front view photo
productSA6400back view photo
  • 1Power Button and Indicator
  • 2Status Indicator
  • 3Alert Indicator
  • 4Mute Button
  • 5Drive Status Indicators
  • 6Drive Trays
  • 7Rail Kit Release Tabs
  • 8PSU Fans
  • 9Power Ports
  • 10PSU Indicators
  • 11Expansion Ports
  • 12PCIe Expansion Slots
  • 13Reset Button
  • 14Console Port
  • 15Management Port
  • 16USB 3.2 Gen 1 ports
  • 171GbE RJ-45 ports
  • 1810GbE RJ-45 ports


  1. Performance figures are obtained through internal testing by Synology. Actual performance may vary depending on the testing environment, usage, and configuration. See performance charts for more information.

  2. Figures were obtained in tests using a SA6400 running Synology DSM 7.2 with 128 GB of RAM, 2 x E25G21-F2 25GbE NICs, 12 x SAT5210-960G SSDs in 2 x RAID 6 volumes, and 3 x RX1223RP expansion units, each with 12 x SAT5210-960G SSDs in RAID 6 volumes. Actual performance may vary depending on hardware and software configuration, workload, and testing environment.

  3. For the most up-to-date list of compatible NICs, please check our compatibility list.

  4. C2 Storage for Hyper Backup and Hybrid Share requires purchase of an eligible annual or monthly subscription. A free trial is available for each newly registered device.

  5. Certain advanced features require Virtual Machine Manager Pro. One Virtual DSM license is included. Additional Virtual DSM instances require the purchase of Virtual DSM Licenses.

  6. The warranty period starts from the date of purchase as stated on your purchase receipt. Visit for more information.

Hardware Specifications
CPU Model AMD EPYC 7272
CPU Quantity 1
CPU Architecture 64-bit
CPU Frequency 12-core 2.9 (base) / 3.2 (turbo) GHz
Hardware Encryption Engine (AES-NI)
System Memory 32 GB DDR4 ECC RDIMM
Memory Module Pre-installed 32 GB (32 GB x 1)
Total Memory Slots 16
Maximum Memory Capacity 1024 GB (64 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.
  • Installing memory modules with differing capacities is not recommended. Check the Hardware Installation Guide of your Synology product for recommended memory configurations.
Drive Bays 12
Maximum Drive Bays with Expansion Unit 108 (RX1223RP x 8)
Compatible Drive Type* (See all supported drives)
  • 3.5" SATA HDD
  • 2.5" SATA SSD
Hot Swappable Drive*
  • It is strongly recommended that you only install drives listed on your device's compatibility list. Storage pool and volume creation processes may fail when using unverified drives. Synology is unable to provide technical support for devices using unsupported components.
  • "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.
External Ports
External Ports
RJ-45 1GbE LAN Port 4 (with Link Aggregation / Failover support)
RJ-45 10GbE LAN Port 2 (with Link Aggregation / Failover support)
Out-of-Band Management LAN Port 1
Max. number of LAN ports 15
USB 3.2 Gen 1 Port* 2
Expansion Port 8
Notes The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019.
PCIe Expansion 2 x Gen3 x8 slots (x8 link)
Form Factor (RU) 2U
Size (Height x Width x Depth) 88 mm x 482 mm x 724 mm
Weight 16.5 kg
Rack Installation Support* 4-post 19" rack (Synology Rail Kit - RKS-02)
Notes The rail kit is sold separately
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* 55.5 dB(A)
Scheduled Power On / Off
Wake on LAN / WAN
Power Supply Unit / Adapter 550 W
Redundant Power Supply
AC Input Power Voltage 100V to 240V AC
Power Frequency 50/60 Hz, Single Phase
Power Consumption 180.5 W (Access)
88.56 W (HDD Hibernation)
British Thermal Unit 615.89 BTU/hr (Access)
302.18 BTU/hr (HDD Hibernation)
  • For more information on how power consumption is measured, refer to this article.
  • Noise testing was conducted with the Synology system fully installed with Synology SATA SSDs and in an idle state. Two GRAS 40AE microphones were placed at a 1 m distance from the front and rear of the device. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%.
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
  • FCC
  • CE
  • BSMI
  • VCCI
  • RCM
  • UKCA
  • EAC
  • CCC
  • KC
  • UL
5 Years
Notes The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
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 All memory modules will operate at the maximum frequency specified by the CPU manufacturer.
DSM Specifications
Maximum Single Volume Size
  • 1 PB (64 GB memory required, for RAID 6 groups only)
  • 200 TB
  • 108 TB
Maximum Internal Volume Number 256
SSD Read / Write Cache (White Paper)
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
  • Usable capacity for each volume will be lower than the maximum volume size and is dependent on the filesystem and the amount of system metadata stored.
  • When Peta Volume is enabled, validated services and packages are required. Please refer to this article for more information on limitations.
  • Volumes over 108 TB require 32 GB of memory or more.
Internal Drives
  • Btrfs
  • ext4
External Drives
  • Btrfs
  • ext4
  • ext3
  • FAT
  • NTFS
  • HFS+
  • exFAT
File Protocol
  • SMB
  • AFP
  • NFS
  • FTP
  • WebDAV
  • Rsync
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
  • 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.
Maximum Local User Accounts 16,000
Maximum Local Groups 512
Maximum Shared Folder 512
Maximum Shared Folder Sync Tasks 32
Hybrid Share Folder Number 30
Folder and Package Backup
Entire System Backup
Notes Full-system backup requires DSM 7.2 or later.
Synology High Availability
Syslog Events per Second 3,000
VMware ESXi 6.5 and VAAI
Windows Server 2022
Citrix Ready
Supported Protocols SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, Fibre Channel, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
Supported Browsers
  • Chrome
  • Firefox
  • Edge
  • 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.
Antivirus by McAfee (Trial)
Antivirus by McAfee (Trial)
Suggested Concurrent Users 1,500
  • Measured with simulated users, each with an average record of 20,000 messages, emojis, or stickers. The required server response time is below ten seconds.
  • When applicable, tested systems are configured with maximum memory and set to allow the maximum number of connections.
Download Station
Download Station
Maximum Concurrent Download Tasks 80
Maximum iSCSI Target Number 256
Maximum LUN 512
LUN Clone/Snapshot, Windows ODX
Free Email Accounts 5 (Additional accounts require purchase of licenses)
Suggested Maximum Users 14,000
Suggested Concurrent Users 2,800
Maximum Server Performance 5,721,000 emails per day, approx. 174 GB
  • Models with more than 4 bays were installed with two SSDs for SSD cache.
  • 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).
DLNA Compliance
Facial Recognition
Object Recognition
Maximum Snapshots per Shared Folder 1,024
Maximum of System Snapshots 65,536
Default Licenses 2 (Additional cameras require purchase of licenses)
Maximum IP Cameras and Total FPS (H.264)
  • 720p: 180 channels, 5400 FPS
  • 1080p: 100 channels, 2800 FPS
  • 3M: 100 channels, 1500 FPS
  • 5M: 90 channels, 900 FPS
  • 4K: 60 channels, 600 FPS
Maximum IP Cameras and Total FPS (H.265)
  • 720p: 300 channels, 9000 FPS
  • 1080p: 200 channels, 4000 FPS
  • 3M: 100 channels, 2700 FPS
  • 5M: 100 channels, 1500 FPS
  • 4K: 100 channels, 1120 FPS
  • Surveillance Station 9.1.3 or above is required to support the maximum IP cameras and FPS figures listed.
  • Performance figures are obtained from testing conducted with the device fully populated with drives under a continuous recording setup. Actual system capabilities may vary based on configuration, drive performance, enabled features, and the presence of additional workloads.
  • Use NVR Selector to quickly find a suitable model based on your requirements.
  • Maximum supported frames per second can be increased by adding one expansion unit. For detailed figures, please refer to this article.
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)
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)
  • 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.
Suggested Maximum Users 20,000
Suggested Concurrent Users 8,000
  • 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
Recommended Virtual Machine Instances 24 (Learn more)
Recommended Virtual DSM Number (Licenses required) 24 (including 1 Free License)
Notes The specifications vary depending on system configuration and memory size.
Maximum Connections 60


  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.