SA3400D 12 Bay Active Passive Dual Controller
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Product Specifications
Hardware Specs
Controller
- Number of Controller Module: 2
- CPU Model: Intel Xeon D 1541
- CPU Quantity: 1 (per controller)
- CPU Core: 8
- CPU Architecture: 64-bit
- CPU Frequency: 2.1 GHz (base) / 2.7 GHz (turbo)
Memory
- System Memory: 8 GB DDR4 ECC UDIMM (per controller)
- Total Memory Slots: 4 (per controller)
- Maximum Memory Capacity: 64 GB
Storage
- Drive Bays: 12
- Maximum Drive Bays with Expansion Unit: 36
- Drive Type: 2.5 dual-port SAS SSD, 3.5 dual-port SAS HDD
Software Specs
DSM Specifications
- Storage Management
- Maximum Single Volume Size: 108 TB (32 GB memory required)
Product Usage Instructions
FAQ
Q: How do I install additional memory modules?
A: To install additional memory modules, follow these steps:
Step 1: Power off the device and disconnect all cables. Step 2:
Open the chassis to access the memory slots. Step 3: Insert the
memory module into an available slot, ensuring it is properly
seated. Step 4: Close the chassis and reconnect all cables. Step 5:
Power on the device and check the system recognizes the new
memory.
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Product Specifications
SA3400D
Last updated: Jul 2, 2025
Hardware Specs
Controller
Number of Controller Module 2
CPU CPU Model CPU Quantity CPU Core CPU Architecture CPU Frequency Hardware Encryption Engine
Intel Xeon D 1541
1 (per controller)
8
64-bit
2.1 (base) / 2.7 (turbo) GHz
v
Memory System Memory Memory Module Pre-installed Total Memory Slots Maximum Memory Capacity
Notes
8 GB DDR4 ECC UDIMM (per controller)
8 GB 8 GB x 1 (per controller)
4 (per controller)
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 nonSynology memory modules are used for memory expansion. For multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.
Storage Drive Bays Maximum Drive Bays with Expansion Unit Drive Type See all supported
drives)
Hot Swappable Drive*
Notes
12
36 RXD1219sas x 2 2.5″ dual-port SAS SSD 3.5″ dual-port SAS HDD
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External Ports RJ 45 1GbE LAN Port RJ 45 10GbE LAN Port Expansion Port Expansion Port Type
Notes
2 (per controller) 1 (per controller) 1 (per controller)
Mini-SAS HD This device’s 1GbE LAN ports have a maximum transmission unit MTU size of 1,500 bytes.
PCIe PCIe Expansion
1 x Gen3 8 slot (x8 link) (per controller)
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
Easy Replacement System Fan v
Power Recovery
v
Noise Level*
51.3 dB A
Power Supply Unit / Adapter 500 watts
Redundant Power Supply
v
AC Input Power Voltage
100V to 240V AC
Power Frequency
50/60 Hz, Single Phase
Power Consumption*
257.78 watts Access)
British Thermal Unit
879.58 BTU/hr Access)
Notes
Power consumption is measured when it is fully loaded
with Synology 12TB HAS5300 12T hard drive(s). 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%
Temperature Operating Temperature Storage Temperature Operating Humidity Storage Humidity
0°C to 35°C 32°F to 95°F 20°C to 60°C 5°F to 140°F
8% to 80% RH 5% to 95% RH
Certification
FCC CE BSMI VCCI RCM UKCA EAC CCC KC
Warranty
5 Years
Notes
The warranty period starts from the purchase date as stated on your purchase receipt. Learn more)
Environment
RoHS Compliant
Packaging Content
Main Unit X 1 Accessory Pack X 1 AC Power Cord X 2 Quick Installation Guide X 1
Optional Accessories
DDR4 ECC UDIMM D4EC 2666 8G/D4EC 2666 16G Expansion Units: RXD1219sas Enterprise Series 3.5″ SAS HDD HAS5300 Series 25GbE Network Interface Card: E25G30 F2 10GbE Network Interface Card: E10G30 F2/E10G30 T2/E10G18 T1 Rail Kit Sliding: RKS 02
Notes
For multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.
Software Specs
DSM Specifications
Storage Management
Maximum Single Volume Size
200 TB 32 GB memory required) 108 TB
Maximum Internal Volume
Number
64
SSD Read/Write Cache
Determining cache size)
v
SSD TRIM
v
RAID Group
v
Supported RAID Type
RAID F1 Basic JBOD RAID 0 RAID 1 RAID 5 RAID 6 RAID 10
RAID Migration
Basic to RAID 1 Basic to RAID 5 RAID 1 to RAID 5
Volume Expansion with Larger HDDs
RAID F1 RAID 1 RAID 5 RAID 6 RAID 10
Volume Expansion by Adding a HDD
RAID F1 JBOD RAID 5 RAID 6
Global Hot Spare Supported RAID Type
Notes
RAID F1 RAID 1 RAID 5 RAID 6 RAID 10
Volumes over 108 TB require 32 GB of memory or more. Actual maximum storage pool and volume sizes depend on drive sizes used, the number of drive bays available, and the RAID configuration. 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.
File System
Internal Drives
Btrfs
ext4
File Services File Protocol
SMB AFP NFS FTP WebDAV Rsync
Maximum Number of SMB Connections FSCT Based)
1,400
Windows Access Control List
ACL Integration
v
NFS Kerberos Authentication Notes
v
Connection value of this model is tested with Synology SATA SSD fully populated and up to four 10GbE network
ports
Models with expandable memory are tested with the maximum supported quantity installed. SMB performance was evaluated using Microsoft File Server Capacity Tool FSCT version 1.3, with the following configuration:
Test workload: HomeFolder scenario provided by the FSCT tool Test duration: 600 seconds Domain controller & FSCT controller: Windows Server 2022 FSCT clients: 8 Windows 10 machines SMB feature: Directory leasing enabled
Account & Shared Folder
Maximum Local User
Accounts
5,120
Maximum Local Groups
512
Maximum Shared Folder
512
Maximum Shared Folder Sync
Tasks
32
Hybrid Share
Maximum Hybrid Share Folders
15
Hyper Backup Folder and Package Backup Entire System Backup
Notes
v v
Full-system backup requires DSM 7.2 or later.
High Availability Synology High Availability
Notes
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Log Center Syslog Events per Second
3,000
Virtualization
VMware ESXi 6.5 and VAAI
v
Windows Server 2022
v
Citrix Ready
v
OpenStack
v
General Specifications
Supported Protocols
Supported Browsers
Supported Language Notes
SMB1 CIFS , SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, Fibre Channel, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
Chrome Firefox Edge Safari
English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, , Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Ceský, ,
, , ,
For an updated list of supported browser versions, check the DSM Technical Specifications.
Add-on Packages view the complete package list
Central Management System
v
Synology Chat
Maximum Number of Users
Notes
500
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.
Models with expandable memory are tested with the maximum supported quantity installed.
SAN Manager
Maximum iSCSI Target
Number
128
Maximum LUN
256
LUN Clone/Snapshot,
Windows ODX
v
Synology MailPlus / MailPlus Server
Free Email Accounts
5 Additional accounts require purchase of licenses)
Maximum Number of Users 3,100
Notes
The suggested maximum number of users is based on
the following workload: 20% of users with a 20,000 item
mailbox randomly performing actions and receiving 240
emails per day, and 80% of users receiving 20 emails
per day. Learn more
Models with SSD support are tested with a single SSD
volume.
Models with expandable memory are tested with the maximum supported quantity installed. Learn more about memory requirements. Operating in high-availability mode will incur additional overhead.
Features enabled during evaluation: anti-spam, antivirus, DNSBL, greylist, content scanning, and full-text search English).
Snapshot Replication Maximum Snapshots per Shared Folder Maximum of System Snapshots
512 16,384
Surveillance Station
Default Licenses Suggested Maximum IP Cameras and Total FPS (H.264 Suggested Maximum IP Cameras and Total FPS (H.265
Notes
2 Additional cameras require purchase of licenses)
1080p: 160 channels, 2800 FPS 3M 160 channels, 1600 FPS 5M 120 channels, 1200 FPS 4K 80 channels, 800 FPS
1080p: 200 channels, 6000 FPS 3M 160 channels, 2800 FPS 5M 160 channels, 1600 FPS 4K 120 channels, 1200 FPS
Surveillance Station 9.1.3 or above is required to support the maximum IP cameras and FPS figures listed. Performance figures are obtained from testing conducted with the device fully populated with drives, with their default memory configuration, and under a continuous recording setup. Actual system capabilities may vary based on configuration, drive performance, enabled features, and the presence of additional workloads. Use NVR Selector to quickly find a suitable model based on your requirements. The number of streams that can be viewed simultaneously is twice the suggested maximum number of cameras. For example, if the suggested maximum number of cameras for a model is 10 under H.264, 1080p, the model can support up to 20 streams of the same specification at the same time.
Synology Drive Maximum Number of Users Maximum Number of Hosted
Files
Notes
2,600
25,000,000 (applies to files indexed or hosted by Synology
Drive. For file access through other standard protocols, refer to the File Services section above)
The suggested maximum number of users is based on
the following workload: 20% of users randomly perform
file operations (upload, download, move, and delete),
and 80% of users are logged in but idle. Learn more
Models with SSD support are tested with a single SSD
volume. Models with expandable memory are tested with the maximum supported quantity installed.
Exceeding the recommended numbers above will not
block application operations, but may result in longer response time.
Btrfs file system and non-encrypted shared folders
were used during the aforementioned testing.
Synology Office Maximum Number of Users
Notes
2,600
The suggested maximum number of users is based on
the following workload: 20% of users are executing
random actions at an average of 30-second intervals,
and 80% of users are logged in and viewing a file. Learn
more
Models with SSD support are tested with a single SSD
volume. Models with expandable memory are tested with the maximum supported quantity installed.
Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3 3220 / 8GB RAM
Virtual Machine Manager
Recommended Virtual
Machine Instances
Recommended Virtual DSM
Number Licenses required)
Notes
16 Learn more)
16 (including 1 Free License) The specifications vary depending on system configuration and memory size.
VPN Server
Maximum Connections
32
Documents / Resources
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Synology SA3400D 12 Bay Active Passive Dual Controller [pdf] Instruction Manual SA3400D 12 Bay Active Passive Dual Controller, SA3400D, 12 Bay Active Passive Dual Controller, Active Passive Dual Controller, Passive Dual Controller, Dual Controller |