New upgraded Synology Surveillance DVA3221 Deep Learning NVR


Previous models gets new GPU and more RAM. NVIDIA GeForce GTX 1650.

Check comparison here :

Read more at userbenchmark


Here come specs :


Processor model Intel Atom C3538
Processor architecture 64-bit
Processor clock Quad core 2.1 GHz
Hardware encryption engine (AES-NI)


GPU model NVIDIA GeForce GTX 1650
Remarks Display output is not supported.


System memory 8 GB DDR4
Pre-installed memory modules 8 GB (4 GB x 2)
Total memory slots 2
Maximum memory capacity 32 GB (16 GB x 2)
  • Please purchase Synology original memory modules for best compatibility and reliability. If Synology memory modules are not used when expanding memory capacity, Synology will not be able to provide complete product warranty or technical support.
  • Synology reserves the right to replace memory components with the same or higher frequency depending on the supplier’s product availability. Its compatibility and stability have passed the same strict test and inspection, please rest assured to use it.

Storage device

Number of Disk Slots 4
Maximum number of disk bays for installing expansion units 14 (DX517 x 2)
Compatible Disk Type*
  • 3.5″ SATA HDD
  • 2.5″ SATA HDD
  • 2.5″ SATA SSD
Maximum internal net total storage capacity 64 TB (16 TB drive x 4) (Capacity may vary by RAID types)
Maximum net total storage capacity with expansion device 224 TB (16 TB drive x 14) (Capacity may vary by RAID types)
Maximum single storage capacity* 108 TB
Disk hot swap support
  • Compatible disk types refer to the types of hard disks that are confirmed to be compatible with the product after actual testing. The maximum speed of non-hard disk slots is limited.
  • The maximum net total storage capacity is not limited by the maximum single storage space capacity. Synology NAS can use capacity beyond the maximum single storage space to create other storage space. The maximum capacity depends on the support level of each model. 
  • The internal storage space can be expanded, but the single storage space after expansion cannot exceed 108 TB.

External port

RJ-45 1GbE network port 4 (Support Link Aggregation / Failover)
USB 3.0 port 3
eSATA port 2
COM Port 1


Size (height X width X depth) 166 mm x 250 mm x 237 mm
weight 4.92 kg

other projects

Wake on LAN
System fan 120 mm x 120 mm x 1 pcs
Fan mode
  • Low temperature mode
  • Silent mode
  • Full speed mode
Automatic power recovery
Noise value* 28.3 dB(A)
Timer switch
Power supply/transformer 250 W
AC input voltage 100 V to 240 V AC
Current frequency 50/60 Hz, single frequency
Power consumption power* 43.92 W (Access)
28.43 W (HDD Hibernation)
British Thermal Unit 149.86 BTU/hr (Access)
97.01 BTU/hr (HDD Hibernation)
Remarks The power consumption test data is obtained when the Western Digital 1TB WD10EFRX hard drive is full.


Operating temperature 0°C to 40°C (32°F to 104°F)
Storage temperature -20°C to 60°C (-5°F to 140°F)
Relative humidity 5% to 95% RH

Certification body

  • FCC
  • CE
  • BSMI
  • EAC
  • VCCI
  • RCM


3 years
Remarks The warranty period starts from the date of purchase stated on the purchase receipt


RoHS compliant

Package contents

  • Host X 1
  • Accessory bag X 1
  • Power cord X 1
  • RJ-45 network cable X 2
  • Quick Installation Guide X 1

Optional accessories

  • DDR4 ECC SODIMM: D4ECSO-2666-16G
  • Expansion device: DX517
  • 2.5″ SATA SSD: SAT5200
  • VisualStation: VS960HD / VS360HD
  • Monitoring device authorization
Remarks If you want to install additional ECC memory modules, you must first remove the non-ECC memory that was originally equipped. For more information, please refer to


DSM product specifications

File system

Internal disk
  • Btrfs
  • EXT4
External disk
  • Btrfs
  • EXT4
  • EXT3
  • FAT
  • NTFS
  • HFS+
  • exFAT*
Remarks exFAT Access needs to be purchased separately from the Kit Center.

Storage space management

Maximum storage space 64
Maximum number of iSCSI targets 128
Maximum number of iSCSI LUNs 256
SSD read/write cache (White Paper)
Support RAID array type
  • Synology Hybrid RAID
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10
RAID configuration migration
  • Basic to RAID 1
  • Basic to RAID 5
  • RAID 1 to RAID 5
  • RAID 5 to RAID 6
Use larger hard drives to expand storage space
  • Synology Hybrid RAID
  • RAID 10
  • RAID 1
  • RAID 5
  • RAID 6
Add hard drives to expand storage space
  • Synology Hybrid RAID
  • JBOD
  • RAID 5
  • RAID 6 (with expansion unit)
Global Hot Spare supports RAID types
  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10

File service

File agreement CIFS/AFP/NFS/FTP/WebDAV
Maximum number of simultaneous CIFS/AFP/FTP connections 1,000
Windows Access Control List (ACL) integration
NFS Kerberos authentication

Accounts and shared folders

Maximum number of local user accounts 2,048
Maximum number of local groups 256
Maximum number of shared folders 512
Windows Access Control List (ACL) integration

Log center

Logs received per second 800

General specifications

Network protocol SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
Supported browsers
  • Google Chrome
  • Firefox
  • Microsoft Edge
  • Internet Explorer 10 or above
  • Safari 10 or above
  • Safari (iOS 10 or above)
  • Google Chrome (Android 6.0 or above)
Supported languages English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไ긭ย, Chinese Simplified Chinese, Traditional Chinese

Add-on kit

Surveillance Station

Maximum number of cameras supported (camera authorization required) 32 (including 8 sets of free licenses) (check compatible IP cameras)
Frames per second (FPS) (H.264) 960 FPS @ 720p (1280×720), 32 channels
448 FPS @ 1080p (1920×1080), 32 channels
280 FPS @ 3M (2048×1536), 28 channels
190 FPS @ 5M (2591×1944), 19 channels
130 FPS @ 4K (3840×2160), 13 channels
Frames per second (FPS) (H.265) 960 FPS @ 720p (1280×720), 32 channels
960 FPS @ 1080p (1920×1080), 32 channels
320 FPS @ 3M (2048×1536), 32 channels
200 FPS @ 5M (2591×1944), 20 channels
150 FPS @ 4K (3840×2160), 15 channels
Deep image analysis function
  • Vehicle detection
  • Crowd count
  • Face recognition
  • Intrusion detection
Maximum number of in-depth image analysis tasks 6
Maximum number of people registered in the face database 10,000
Image format
  • H.264
  • H.264+
  • H.265
  • H.265+
  • MPEG-4
  • MxPEG (does not support deep image analysis tasks)
Sound format
  • AAC
  • AMR
  • G711
  • G726
  • PCM
  • Surveillance Station uses an Axis camera during the test; the recording schedule is continuous recording; the Surveillance Station is used as the real-time image source; the motion detection source is set to the camera; the real-time image and the recording use the same set of image streams.
  • Other concurrent services may affect the frame per second (FPS), for example: using Archive Vault to perform archiving tasks.
  • The maximum number of channels supported covers devices installed on Virtual DSM.

VPN Server

Maximum number of connections 30






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