Synology UC3400


UC Series RackStation UC3400

Active-active SAN storage for mission-critical environments

CPU: Intel Xeon D-1541 8-core 2.1 (base) / 2.7 (turbo) GHz


RJ-45 10GbE LAN Port x1

RJ-45 Gigabit LAN Port x2

PCIe Gen3 x8 slot x1

Redundant Power Supply

5 Years Warranty

----- Reference -----

Synology UC3400 12 Bays NAS, Active-active SAN storage for mission-critical environments, CPU: Intel Xeon D-1541 8-core 2.1 (base) / 2.7 (turbo) GHz, RAM: 8 GB DDR4 ECC UDIMM (Max 64GB), RJ-45 10GbE LAN Port x1, RJ-45 Gigabit LAN Port x2, PCIe Gen3 x8 slot x1, Redundant Power Supply, 5 Years Warranty

Drive Bays : 12-Bays NAS
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Synology UC3400

Active-active SAN storage for mission-critical environments

Dual Controller Module

Dual Controller Module

Ensure interruption-free iSCSI and FC services

High Performance

High Performance

Over 180,000 4K Random Write IOPS, and up to 576 TB of storage



Full support for mainstream virtualization systems

Reliability and High Availability

Active-active dual controllers work simultaneously to ensure zero downtime in the event of a controller failure while the non-transparent bridge (NTB) enables inter-domain communication to maximize the protection of in-flight data.

Active-Active SAN with enterprise-class performance

Designed for mission-critical environments, UC3400 is a high-availability SAN solution supporting Fibre Channel (FC) and iSCSI protocols. With over 180,000 4K random write IOPS,1 it supports a wide range of demanding workloads.

Random Write

Random mixed


Full certification for VMware, vSphere, Microsoft Hyper-V, Citrix XenServer, and OpenStack environments

Support for Windows Offloaded Data Transfer (ODX), VMware vSphere Storage APIs Array Integration (VAAI), and ALUA ensure optimized and efficient storage operations

OpenStack® Cinder support enables UC3400 to become a block-based storage component


Flexible network options

Boost network from 10GbE and dual 1GbE RJ-45 ports to 10/25 Gb Ethernet cards or 16 Gb Fibre channel host bus adapters on each controller.2

Built-in data protection and security

Maximize service uptime for critical services and enhance data security with snapshot protection and self-encrypting drive support in UC3400.

Storage expansion

Simple capacity expansion of up to 576 TB of raw storage is available with two Synology RXD1219sas Expansion Units.3

Performance backed by Synology drives

Leverage high sustained performance and reliability with enterprise-grade drives with built-in protection designed for Synology systems.4

5-year warranty

At Synology, we are committed to product innovation and quality. Synology guarantees a robust and reliable data management experience with a 5-year limited warranty, providing responsive technical support and hardware replacement services to maximize your return on investment.5 


productUC3400front view photo
productUC3400back view photo

Power Button and Indicator

High Availability Status Indicator

Alert Indicator

Mute Button

Drive status indicators

Drive trays

Rail Kit Release Tabs

Power Ports

PSU indicators

10  PSU fans

11  PCI Express Expansion Slots

12  Console Ports

13  1GbE RJ-45 Ports

14  10GbE RJ-45 Ports

15  Expansion Ports

16  Reset Buttons

17  Remove Indicators

18  Alert Indicators

19  Status Indicators

20  Power Indicators

Number of Controller Module 2
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)
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)
  • 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.
Drive Bays 12
Maximum Drive Bays with Expansion Unit 36 (RXD1219sas x 2)
Compatible Drive Type* (See all supported drives)
  • 2.5” dual-port SAS SSD
  • 3.5” dual-port SAS HDD
Hot Swappable Drive*
  • Synology only guarantees full functionality, reliability, and performance for Synology drives listed on the compatibility list. The use of non-validated components may limit certain functionality and result in data loss and system instability.
  • "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
RJ-45 1GbE LAN Port 2 (with Link Aggregation / Failover support) (per controller)
RJ-45 10GbE LAN Port 1 (per controller)
PCIe Expansion 1 x Gen3 x8 slot (x8 link) (per controller)
Add-In-Card Support
  • 10GbE NIC
  • 25GbE NIC
  • FC HBA
Internal Drives Btrfs
Size (Height x Width x Depth) 88 mm x 430.5 mm x 692 mm
Size (Height x Width x Depth) (with server ears) 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
System Fan 60 mm x 60 mm x 2 (per controller)
Fan Speed Mode
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
Easy Replacement System Fan
Power Recovery
Noise Level* 51.3 dB(A)
Power Supply Unit / Adapter 500W
Redundant Power Supply
AC Input Power Voltage 100 V to 240 V AC
Power Frequency 50/60Hz, Single Phase
Power Consumption 239.25 W (Access)
British Thermal Unit 816.35 BTU/hr (Access)
  • Noise Level Testing Environment: Fully loaded with Synology HAS5300-8T hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology NAS at the front and rear. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
  • Power consumption is measured when it is fully loaded with Synology 12TB HAS5300-12T hard drive(s).
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
  • CE
  • FCC
  • BSMI
  • VCCI
  • RCM
  • UKCA
  • KC
  • EAC
5 Years
Notes The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
RoHS Compliant
Packaging Content
  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Cord X 2
  • Quick Installation Guide X 1
Optional Accessories
Notes All memory modules will operate at the maximum frequency specified by the CPU manufacturer.                           

: UC3400
: 2 Items
Hurry! only 2 items left in stock.