12-bay active-passive dual-controller storage
Synology SA3400D 12-Bay Dual-Controller High-Availability Storage Server
The Synology SA3400D is designed for high-availability file and block storage, combining Intel Xeon D-1541, 8 GB DDR4 ECC UDIMM per controller, 12 hot-swappable bays and 2 × 1GbE RJ-45 plus 1 × 10GbE RJ-45 per controller.
- Processor
- Intel Xeon D-1541
- Memory
- 8 GB DDR4 ECC UDIMM per controller
- Drive bays
- 12 / up to 36
- Networking
- 2 × 1GbE RJ-45 plus 1 × 10GbE RJ-45 per controller
Keep business storage services online with controller redundancy
The Synology SA3400D combines two hot-swappable controllers in an active-passive design with twelve dual-port SAS drive bays. It is designed to keep file, backup and block-storage services available while providing enterprise networking and expansion options in a 2U rackmount chassis.
Active-passive controller protection
A secondary controller can take over services when the active controller is unavailable.
12 hot-swappable drive bays
Install compatible 3.5-inch dual-port sas hdd; 2.5-inch dual-port sas ssd and expand to 36 bays where the listed expansion unit is used.
Expandable ECC memory
The system includes 8 GB DDR4 ECC UDIMM per controller and supports up to 64 GB (16 GB × 4) per controller.
Integrated business networking
2 × 1GbE RJ-45 plus 1 × 10GbE RJ-45 per controller provides wired connectivity without requiring the main PCIe expansion option.
Storage and I/O expansion
The verified Mini-SAS HD expansion connection and 1 × Gen3 x8 slot (x8 link) per controller support future capacity or connectivity requirements.
Redundant power supplies
Two power paths reduce exposure to a single power-supply failure.
Who is the Synology SA3400D best for?
A strong choice for
- Business file and block storage where service continuity matters
- Backup repositories and centralised data management
- Organisations wanting active-passive controller failover in one chassis
- SAS deployments expanding from 12 to 36 drive bays
- Rack environments requiring redundant power and built-in 10GbE
Consider another model if you need
- A smaller system with fewer than 12 drive bays
- An active-active SAN architecture for dedicated block storage
- A SATA-only drive strategy without SAS media
- A desktop enclosure rather than a rackmount system
Key specifications
- Model
- SA3400D
- Product type
- 12-bay active-passive dual-controller storage
- Processor
- Intel Xeon D-1541, 8 cores, 16 threads
- CPU frequency
- 2.1 GHz base / 2.7 GHz turbo
- System memory
- 8 GB DDR4 ECC UDIMM per controller
- Maximum memory
- 64 GB (16 GB × 4) per controller
- Drive bays
- 12; up to 36 (RXD1219sas × 2)
- Drive types
- 3.5-inch dual-port SAS HDD; 2.5-inch dual-port SAS SSD
- Networking
- 2 × 1GbE RJ-45 plus 1 × 10GbE RJ-45 per controller
- PCIe expansion
- 1 × Gen3 x8 slot (x8 link) per controller
- Dimensions (H × W × D)
- 88 × 482 × 724 mm
- Warranty
- 5 years
Full technical specifications
Processor, controller and memory
| Model | SA3400D |
|---|---|
| Controller architecture | 2 controller modules; active-passive high availability |
| CPU model | Intel Xeon D-1541 |
| CPU quantity | 1 per controller |
| CPU cores | 8 |
| CPU threads | 16 |
| CPU architecture | 64-bit |
| CPU frequency | 2.1 GHz base / 2.7 GHz turbo |
| Hardware encryption engine | Supported |
| System memory | 8 GB DDR4 ECC UDIMM per controller |
| Pre-installed memory | 8 GB (8 GB × 1) per controller |
| Total memory slots | 4 per controller |
| Maximum memory capacity | 64 GB (16 GB × 4) per controller |
| Memory guidance | Use Synology memory modules and follow the exact model manual for supported configurations |
Storage, network and expansion
| Drive bays | 12 |
|---|---|
| Maximum drive bays with expansion | 36 (RXD1219sas × 2) |
| Compatible drive types | 3.5-inch dual-port SAS HDD; 2.5-inch dual-port SAS SSD |
| System drive | 1 × SATA DOM (pre-installed) |
| Hot-swappable drives | Supported |
| RJ-45 1GbE LAN ports | 2 per controller |
| RJ-45 10GbE LAN ports | 1 per controller |
| Expansion ports | 1 per controller |
| Expansion port type | Mini-SAS HD |
| PCIe expansion | 1 × Gen3 x8 slot (x8 link) per controller |
| Drive compatibility | Use only drives listed for the exact system on Synology’s current compatibility list |
Physical design and power
| Form factor | 2U |
|---|---|
| Size (H × W × D) | 88 × 482 × 724 mm |
| Weight | 19.7 kg |
| Rack installation | 4-post 19-inch rack; compatible rail kit sold separately |
| System fan | 60 × 60 mm × 2 |
| Fan modes | Full-speed, cool and quiet |
| Easy-replacement system fan | Supported |
| Noise level | 51.3 dB(A) |
| Power recovery | Supported |
| Power supply unit | 500 W |
| Redundant power supply | Supported |
| AC input | 100 V to 240 V AC |
| Power frequency | 50/60 Hz, single phase |
| Power consumption | 257.78 W (access) |
| British Thermal Unit | 879.58 BTU/hr (access) |
Environment, warranty and package
| Operating temperature | 0°C to 35°C (32°F to 95°F) |
|---|---|
| Storage temperature | -20°C to 60°C (-5°F to 140°F) |
| Operating humidity | 8% to 80% RH |
| Storage humidity | 5% to 95% RH |
| Certifications | FCC, CE, BSMI, VCCI, RCM, UKCA, EAC, CCC, KC |
| Environment | RoHS compliant |
| Warranty | 5 years |
| Package contents | Main unit × 1; accessory pack × 1; AC power cord × 2; quick installation guide × 1 |
Frequently asked questions about the Synology SA3400D
What is the Synology SA3400D?
The Synology SA3400D is a 12-bay dual-controller high-availability storage server designed for high-availability file and block storage.
Which processor is in the SA3400D?
It uses the Intel Xeon D-1541 with 8 cores and 16 threads, operating at 2.1 GHz base / 2.7 GHz turbo.
How much memory does the SA3400D include?
It includes 8 GB DDR4 ECC UDIMM per controller and supports up to 64 GB (16 GB × 4) per controller.
How many drive bays does the SA3400D have?
It has 12 hot-swappable bays and supports up to 36 (RXD1219sas × 2).
Which drives are supported by the SA3400D?
The verified drive categories are 3.5-inch dual-port sas hdd; 2.5-inch dual-port sas ssd. Confirm the exact drive model on Synology's compatibility list before purchase.
What network ports are built into the SA3400D?
The SA3400D includes 2 × 1GbE RJ-45 plus 1 × 10GbE RJ-45 per controller.
What expansion is available for the SA3400D?
It provides 1 × Gen3 x8 slot (x8 link) per controller plus 1 per controller Mini-SAS HD expansion connection. Use only options listed for the exact model.
Does the SA3400D have redundant power?
Yes. The SA3400D includes redundant power supplies.
What are the dimensions of the SA3400D?
It measures 88 × 482 × 724 mm in height × width × depth and weighs 19.7 kg.
What warranty applies to the SA3400D?
Synology specifies 5 years. The warranty begins from the purchase date shown on the receipt.
- This product is supplied diskless unless the listing explicitly states otherwise; storage drives are sold separately.
- Confirm drives, memory, expansion units, rail kits and add-in cards on Synology’s current compatibility list for the exact model before purchase.
- Actual storage capacity and performance depend on the installed drives, RAID or storage configuration, network and workload.
- The rail kit is sold separately.
