High-availability file and block storage solution
Maintain data availability with an active-passive high availability dual-controller module
Manage, distribute, and protect data, back up endpoints, and guard physical premises
Over 3,500/2,900 MB/s seq. read/write throughput and over 500 TB maximum storage capacity.
Keep file sharing services, block storage, backups, and other office applications online with automatic minute-level failover. Defend against operational disruptions with two independent and hot-swappable controllers operating in an active-passive configuration.
The SA3400D is engineered to provide outstanding performance in both NAS and SAN storage roles. Its throughput and random I/O performance support efficient SMB and NFS file serving as well as a range of iSCSI and Fibre Channel block storage applications.
Manage, protect, and share data with versatile business solutions. Empower team collaboration, sandbox applications, and provide VM storage on a unified platform.



Flexibly scale storage capacity, optimize I/O performance, and meet different network needs with a range of expansion options.
Scale server capacity up to 576 TB when your data storage needs increase by adding two 12-bay RXD1219sas expansion units.
Add 10/25GbE connectivity with optional add-in cards. Create all-flash storage volumes with SAS SSD for lightening-fast I/O, or boost IOPS and cut down latency on HDD volumes by creating SAS SSD read/write cache volumes.
The SA3400D is backed by Synology's 5-year limited warranty, including technical support and hardware replacement services to maximize your return on investment and ensure continuous, high-quality performance.
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DSM Specifications
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| Maximum Single Volume Size |
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| Maximum Internal Volume Number | 64 | |
| SSD Read/Write Cache (Determining cache size) | ||
| SSD TRIM | ||
| RAID Group | ||
| Supported RAID Type |
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| RAID Migration |
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| Volume Expansion with Larger HDDs |
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| Volume Expansion by Adding a HDD |
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| Global Hot Spare Supported RAID Type |
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| Notes |
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| Internal Drives |
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| File Protocol |
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| Maximum Concurrent SMB/AFP/FTP Connections | 1,200 | |
| Maximum Concurrent SMB/AFP/FTP Connections (with RAM expansion) | 6,000 | |
| Windows Access Control List (ACL) Integration | ||
| NFS Kerberos Authentication | ||
| Notes |
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| Maximum Local User Accounts | 16,000 | |
| Maximum Local Groups | 512 | |
| Maximum Shared Folder | 512 | |
| Maximum Shared Folder Sync Tasks | 32 | |
| Maximum Hybrid Share Folders | 30 | |
| Folder and Package Backup | ||
| Entire System Backup | ||
| Notes | Full-system backup requires DSM 7.2 or later. | |
| Synology High Availability | ||
| Notes | Synology High Availability is a built-in package for SA3400D to maximize service uptime. SA3400D does not support forming a high-availability cluster with another server unit. | |
| Syslog Events per Second | 3,000 | |
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Virtualization
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VMware ESXi 6.5 and VAAI | |
| Windows Server 2022 | ||
| Citrix Ready | ||
| OpenStack | ||
| Supported Protocols | SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, Fibre Channel, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV | |
| Supported Browsers |
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| 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. | |
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Add-on Packages view the complete package list
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| Suggested Users | 500 | |
| Notes |
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| Maximum iSCSI Target Number | 256 | |
| Maximum LUN | 512 | |
| LUN Clone/Snapshot, Windows ODX | ||
| Free Email Accounts | 5 (Additional accounts require purchase of licenses) | |
| Suggested Users | 10,000 | |
| Notes |
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| Maximum Snapshots per Shared Folder | 1,024 | |
| Maximum of System Snapshots | 65,536 | |
| Default Licenses | 2 (Additional cameras require purchase of licenses) | |
| Suggested Maximum IP Cameras and Total FPS (H.264) |
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| Suggested Maximum IP Cameras and Total FPS (H.265) |
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| Notes |
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| 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 | 50,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above) | |
| Notes |
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| Suggested Users | 12,500 | |
| Notes |
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| Recommended Virtual Machine Instances | 16 (Learn more) | |
| Recommended Virtual DSM Number (Licenses required) | 16 (including 1 Free License) | |
| Notes | The specifications vary depending on system configuration and memory size. | |
| Maximum Connections | 60 | |
| NAS | |
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| CPU Model | Intel Xeon D-1541 |
| CPU Quantity | 1 (per controller) |
| CPU Core | 8 |
| CPU Architecture | 64-bit |
| CPU Frequency | 2.1 (base) / 2.7 (turbo) GHz |
| Hardware Encryption Engine | Yes |
| Memory | 8 GB DDR4 ECC UDIMM (per controller) |
| Drive Bays | 12 |
| Hot Swappable Drive | Yes |
| RJ-45 1GbE LAN Port | 2 (per controller) |
| System Fan | 60 mm x 60 mm x 2 pcs |
| Power Supply Unit / Adapter | 500 watts |
| Total Memory Slots | 4 (per controller) |
| Maximum Memory Capacity | 64 GB (16 GB x 4) (per controller) |
| Expansion Port | 1 (per controller) |
| PCIe Expansion | 1 x Gen3 x8 slot (x8 link) (per controller) |
| Form Factor (RU) | 2U |
| Redundant Power Supply | Yes |
| RJ-45 10GbE LAN Port | 1 (per controller) |