| Hardware Specifications |
| Controller |
| Number of Controller Module | 2 |
| CPU |
| CPU Model | Intel Xeon D-1541 |
| CPU Quantity | 1 (per controller) |
| CPU Architecture | 64-bit |
| CPU Frequency | 8-core 2.1 (base) / 2.7 (turbo) GHz |
| Hardware Encryption Engine (AES-NI) | ✔ |
| Memory |
| System Memory | 8 GB DDR4 ECC UDIMM (per controller) |
| Memory Module Pre-installed | 8 GB (8 GB x 1) (per controller) |
| Total Memory Slots | 4 (per controller) |
| Maximum Memory Capacity | 64 GB (16 GB x 4) (per controller) |
| Storage |
| Drive Bays | 12 |
| Maximum Drive Bays with Expansion Unit | 36 (RXD1219sas x 2) |
| Compatible Drive Type* (See all supported drives) | 3.5” dual-port SAS HDD |
| 2.5” dual-port SAS SSD |
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| Hot Swappable Drive* | ✔ |
| Notes | 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. |
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| External Ports |
| RJ-45 1GbE LAN Port | 2 (with Link Aggregation / Failover support) (per controller) |
| RJ-45 10GbE LAN Port | 1 (per controller) |
| Out-of-Band Management LAN Port | |
| Max. number of LAN ports | |
| USB 3.2 Gen 1 Port* | |
| Expansion Port | 1 |
| Notes | This device's 1GbE LAN ports have a maximum transmission unit (MTU) size of 1,500 bytes. |
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| PCIe |
| PCIe Expansion | 1 x Gen3 x8 slot (x8 link) (per controller) |
| File System |
| Internal Drives | Btrfs |
| EXT4 |
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| External Drives | |
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| Appearance |
| Form Factor (RU) | 2U |
| Size (Height x Width x Depth) | 88 mm x 482 mm x 724 mm |
| Weight | 19.7 kg |
| Rack Installation Support* | 4-post 19" rack (Synology Rail Kit - RKS-02) |
| Notes | The rail kit is sold separately |
| Others |
| System Fan | 60 mm x 60 mm x 2 pcs |
| Fan Speed Mode | Full-Speed Mode |
| Cool Mode |
| Quiet Mode |
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| Easy Replacement System Fan | ✔ |
| Power Recovery | ✔ |
| Noise Level* | 51.3 dB(A) |
| Scheduled Power On / Off | ✔ |
| Wake on LAN / WAN | ✔ |
| Power Supply Unit / Adapter | 500 W |
| Redundant Power Supply | ✔ |
| AC Input Power Voltage | 100V to 240V AC |
| Power Frequency | 50/60 Hz, Single Phase |
| Power Consumption | 257.78 W (Access) |
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| British Thermal Unit | 879.58 BTU/hr (Access) |
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| 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 | FCC |
| CE |
| BSMI |
| VCCI |
| UKCA |
| EAC |
| CCC |
| KC |
| RCM |
| Warranty | 5 Years |
| Environment | RoHS Compliant |
| Packaging Content | Main Unit X 1 |
| Accessory Pack X 1 |
| AC Power Cord X 2 |
| Quick Installation Guide X 1 |
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| Optional Accessories | DDR4 ECC UDIMM: D4EC-2666-8G/D4EC-2666-16G |
| Expansion Units: RXD1219sas |
| 3.5" SAS HDD: HAS5300 |
| 25GbE Network Interface Card: E25G21-F2 |
| 10GbE Network Interface Card: E10G21-F2/E10G18-T2/E10G18-T1 |
| Rail Kit Sliding: RKS-02 |
| Surveillance Device License Pack |
| Storage Management |
| Maximum Single Volume Size* | 200 TB (32 GB memory required) |
| 108 TB |
| Maximum Internal Volume Number | 64 |
| 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 |
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| RAID Migration | Basic to RAID 1 |
| Basic to RAID 5 |
| RAID 1 to RAID 5 |
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| Volume Expansion with Larger HDDs | RAID F1 |
| RAID 1 |
| RAID 5 |
| RAID 6 |
| RAID 10 |
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| Volume Expansion by Adding a HDD | RAID F1 |
| JBOD |
| RAID 5 |
| RAID 6 |
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| Global Hot Spare Supported RAID Type | RAID F1 |
| RAID 1 |
| RAID 5 |
| RAID 6 |
| RAID 10 |
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| Notes | 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. |
| Each internal volume (may consist of multiple drives) is expandable up to 108 TB (with memory less than 32 GB) or 200 TB (with memory equal to or greater than 32 GB). |
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| File Services |
| File Protocol | SMB/AFP/NFS/FTP/WebDAV |
| 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 | 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. |
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| Account & Shared Folder |
| Maximum Local User Accounts | 16,000 |
| Maximum Local Groups | 512 |
| Maximum Shared Folder | 512 |
| Maximum Shared Folder Sync Tasks | 32 |
| Hybrid Share |
| Hybrid Share Folder Number | 30 |
| Hyper Backup |
| Data & Folder Backup | ✔ |
| Entire System Backup | ✔ |
| Notes | DSM version requirement to support entire system backup: DSM7.2 or later. |
| High Availability |
| 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. |
| Log Center | ✔ |
| Syslog Events per Second | 3,000 |
| Virtualization |
| VMware vSphere with VAAI | ✔ |
| Windows Server 2016 | |
| Windows Server 2019 | |
| Windows Server 2022 | ✔ |
| Citrix Ready | ✔ |
| OpenStack | ✔ |
| General Specifications |
| Networking Protocols | SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, Fibre Channel, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV |
| Supported Browsers | Google Chrome |
| Firefox |
| Microsoft Edge |
| Safari |
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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 |
| Antivirus by McAfee (Trial) | ✔ |
| Central Management System | ✔ |
| Synology Chat | ✔ |
| Maximum Users | |
| Maximum Number of Concurrent Users | 500 |
| Notes | 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, systems are tested configured with maximum memory and set to allow the maximum number of connections. |
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| Document Viewer | ✔ |
| Download Station | |
| Maximum Concurrent Download Tasks | |
| SAN Manager | ✔ |
| Maximum iSCSI Target Number | 256 |
| Maximum LUN | 512 |
| LUN Clone/Snapshot, Windows ODX | ✔ |
| Notes | |
| Synology MailPlus / MailPlus Server | ✔ |
| Free Email Accounts | 5 (Licenses required for additional accounts) |
| Maximum Number of Concurrent Users | 1,100 |
| Maximum Server Performance | 4,312,000 emails per day, approx. 131 GB |
| Media Server | |
| DLNA Compliance | |
| Synology Photos | |
| Facial Recognition | |
| Snapshot Replication | ✔ |
| Maximum Snapshots per Shared Folder | 1,024 |
| Maximum of System Snapshots | 65,536 |
| Surveillance Station | ✔ |
| Maximum IP cam (Licenses required) | 100 (including 2 Free License) (see all supported IP cameras) |
| Total FPS (H.264) | 3000 FPS @ 720p (1280x720) |
| 2600 FPS @ 1080p (1920x1080) |
| 1080 FPS @ 3M (2048x1536) |
| 700 FPS @ 5M (2591x1944) |
| 500 FPS @ 4K (3840x2160) |
| Total FPS (H.265) | 3000 FPS @ 720p (1280x720) |
| 3000 FPS @ 1080p (1920x1080) |
| 2400 FPS @ 3M (2048x1536) |
| 1300 FPS @ 5M (2591x1944) |
| 800 FPS @ 4K (3840x2160) |
| Notes | Maximum IP cameras and FPS figures are tested with the device fully populated with drives and under a continuous recording setup. |
| Actual system capabilities may differ depending on system configuration, drive performance, number of features enabled, and if additional workloads are present. |
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| Synology Drive | ✔ |
| 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 | 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. |
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| 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 |
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| Video Station | |
| Virtual Machine Manager | ✔ |
| 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. |
| VPN Server | ✔ |
| Maximum Connections | 60 |
