12-bay active-active dual-controller SAN
Synology UC3400 12-Bay Active-Active SAN
The Synology UC3400 is designed for mission-critical iSCSI and Fibre Channel block storage, combining Intel Xeon D-1541, 8 GB DDR4 ECC UDIMM per controller, 12 hot-swappable bays and 2 × 1GbE 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 plus 1 × 10GbE RJ-45 per controller
Non-disruptive block storage for virtualised environments
The Synology UC3400 is an active-active SAN with two controllers operating simultaneously for iSCSI and Fibre Channel services. Twelve dual-port SAS bays, controller-level 10GbE connectivity, PCIe expansion and redundant power are designed around block-storage availability and virtualisation workloads.
Active-active dual controllers
UC3400's two controllers operate simultaneously to support high-availability block-storage services.
12 hot-swappable drive bays
Install compatible 2.5-inch dual-port sas ssd; 3.5-inch dual-port sas hdd 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 plus 1 × 10GbE RJ-45 per controller provides wired connectivity without requiring the main PCIe expansion option.
Storage and I/O expansion
The verified 1 × Gen3 x8 slot (x8 link) per controller supports approved network or storage add-in options.
Redundant power supplies
Two power paths reduce exposure to a single power-supply failure.
Who is the Synology UC3400 best for?
A strong choice for
- Organisations deploying high-availability iSCSI or Fibre Channel block storage
- Virtualisation environments requiring active-active controller operation
- SAS storage arrays starting with 12 bays and expanding to 36 bays
- IT teams requiring controller, fan and power redundancy
- Rack deployments using built-in 10GbE with optional faster network or FC cards
Consider another model if you need
- A smaller system with fewer than 12 drive bays
- General-purpose NAS file services rather than dedicated SAN block storage
- A SATA-only drive strategy without SAS media
- A desktop enclosure rather than a rackmount system
Key specifications
- Model
- UC3400
- Product type
- 12-bay active-active dual-controller SAN
- Processor
- Intel Xeon D-1541, 8 cores
- 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
- 2.5-inch dual-port SAS SSD; 3.5-inch dual-port SAS HDD
- Networking
- 2 × 1GbE plus 1 × 10GbE RJ-45 per controller
- PCIe expansion
- 1 × Gen3 x8 slot (x8 link) per controller
- Dimensions (H × W × D)
- 88 × 430.5 × 692 mm
- Warranty
- 5 years
Full technical specifications
Processor, controller and memory
| Model | UC3400 |
|---|---|
| Controller architecture | 2 controller modules; active-active SAN architecture |
| CPU model | Intel Xeon D-1541 |
| CPU quantity | 1 per controller |
| CPU cores | 8 |
| 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 | 2.5-inch dual-port SAS SSD; 3.5-inch dual-port SAS HDD |
| Hot-swappable drives | Supported |
| RJ-45 1GbE LAN ports | 2 with Link Aggregation/failover per controller |
| RJ-45 10GbE LAN ports | 1 per controller |
| PCIe expansion | 1 × Gen3 x8 slot (x8 link) per controller |
| Supported add-in card categories | 10GbE NIC; 25GbE NIC; Fibre Channel HBA |
| Internal file system | Btrfs |
| 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 × 430.5 × 692 mm |
| Size with server ears (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 per controller |
| 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 | 239.25 W (access) |
| British Thermal Unit | 816.35 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) |
| Relative humidity | 5% to 95% RH |
| Certifications | CE, FCC, BSMI, VCCI, RCM, UKCA, KC, EAC |
| 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 UC3400
What is the Synology UC3400?
The Synology UC3400 is a 12-bay active-active SAN designed for mission-critical iSCSI and Fibre Channel block storage.
Which processor is in the UC3400?
It uses the Intel Xeon D-1541 with 8 cores, operating at 2.1 GHz base / 2.7 GHz turbo.
How much memory does the UC3400 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 UC3400 have?
It has 12 hot-swappable bays and supports up to 36 (RXD1219sas × 2).
Which drives are supported by the UC3400?
The verified drive categories are 2.5-inch dual-port sas ssd; 3.5-inch dual-port sas hdd. Confirm the exact drive model on Synology's compatibility list before purchase.
What network ports are built into the UC3400?
The UC3400 includes 2 × 1GbE plus 1 × 10GbE RJ-45 per controller.
What expansion is available for the UC3400?
It provides 1 × Gen3 x8 slot (x8 link) per controller. Use only options listed for the exact model.
Does the UC3400 have redundant power?
Yes. The UC3400 includes redundant power supplies.
What are the dimensions of the UC3400?
It measures 88 × 430.5 × 692 mm in height × width × depth and weighs 19.7 kg.
What warranty applies to the UC3400?
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.
- This is a SAN block-storage platform; confirm protocol, host and virtualisation requirements before deployment.
- The rail kit is sold separately.
