Synology DiskStation DS1821+

Synology DiskStation DS1821+

AMD Ryzen Processor - 8 Drive Bays - Up to 32Gb Memory

The Synology DS1821+ 8-bay NAS is aimed at IT enthusiast and SMB customers looking for a powerful and scalable storage solution.


AMD Ryzen™ Quad-core 2.2 GHz


Expand up to 18 drives with two DX517 expansion unit. Large single partition up to 108TB single partition.

Cache Acceleration

2 x built-in M.2 2280 NVMe SSD slots


113K 4K random read IOPS

Virtual Machine Manager

Virtual Machine Manager enables you to test new software in sandboxes, isolate your customers’ machines, and increase the flexibility of your server. You can easily run Windows, Linux, and Virtual DSM on your Synology NAS by just a few steps.

Snapshots for virtual machines

Perfectly clone and restore a virtual machine within seconds.

Live migration

Seamlessly migrate Virtual DSM instances from a Synology NAS to another.

Multi-tenant environment

Create multiple isolated virtual machines for subsidiary business units or departments.

Powerful AMD Ryzen Processor

The DS1821+ can handle demanding application workloads and a greater number of concurrent users. Experience faster file indexing in Synology Drive, photo organization in Moments, and more responsive web services.

Optimize performance and capacity

DS1520+ provides two built-in M.2 SSD slots so that you can take full advantage of Synology SSD Cache functionality. Add SSD cache for up to 20 times faster I/O response without using front drive bays. You can add 10 more drives with two Synology DX517 to expand storage capacity.

Access and sync your files seamlessly

Synology Drive provides a built-in universal portal to access your data anytime and anywhere, and synchronize all your files across platforms, including Windows, macOS, Linux, Android, and iOS.

  • Sync files on demand: Save the storage space and network bandwidth of your PC.
  • Go back in time: Easily retrieve previous versions of your shared files.
  • Back up your data: Protect your files as scheduled or in real-time.

Turbocharge and supersize it

Upgrade your DS1821+ to match your data requirements, whether it is for faster networking or for higher storage capacity.

  • 10GbE support
    Add in faster SFP+ or RJ-45 networking to turbocharge existing workflows
  • 2 x M.2 NVMe
    Enable ultra-fast NVMe cache to accelerate HDD arrays by 20X or more
  • Storage Expansion
    Supports two DX517 expansion units for a total of 18 bays

Included Synology Features

Video Station

Video Station (DS Video app) helps you manage all the movies, TV shows, and home videos on your Synology NAS. Moreover, it can stream videos to various devices — computers, smartphones, media players, and TVs — to provide you with non-stop, fun watching experience.

Audio Station

With Audio Station and its mobile app DS audio, you can enjoy high-quality playback, listen to radios, manage your music collection, create personal playlist, and share with friends anywhere.


Users can instantly upload photos to their private storage and let auto-sort take care of the rest. Moments is the brand new photo solution for personal and home use.

PLEX Media Server

Enjoy Live TV & DVR, a growing catalog of great web shows, news, and podcasts. It's finally possible to enjoy all the media you love in a single app, on any device, no matter where you are. With the Plex server you can stream your video, music, and photo collections any time, anywhere, to whatever you want.

Synology Drive

Online File Syncing, Backup and File Sharing. Across multiple devices mobile phones, laptops, desktops and even other synology nas devices.

Desktop Backup

Simplified backup solution for your Mac, PC, and mobile devices.

Surveillance Station

Protect your business, home, and other environments with reliable, intuitive Surveillance Station, delivering intelligent monitoring and video management tools to safeguard your valuable assets.

File Server / Web Server

Powerful built-in file management and sharing services.

Snapshot Replication

Schedulable and instantaneous data protection for shared folders and iSCSI LUNs for disaster prevention.



Comprehensive built-in security tools are constantly updated to protect your devices against evolving threats.

Download and experience video station now

DS video is available for iOS and Android users, for free. You can download the apps through App Store or Google Play.



Detailed Look

CPU Model
AMD Ryzen V1500B
Quad-Core 2.2GHz
System Memory
4 GB - Upgradable to 32Gb (16 GB x 2)
Network interface
4 Gigabit Ethernet (with Link Aggregation / Failover support)
Upgradable to 10Gb, 25Gb, SFP+
Internal File System
Btrfs, EXT4
Internal drive bays
Five - Expand up to 15 drives with expansion unit.
Maximum Single Volume Size 108 TB
Hardware Encryption Engine
Hardware Transcoding
Transcoding Engine
H.264 (AVC), H.265 (HEVC), MPEG-2 and VC-1; maximum resolution: 4K (4096 x 2160); maximum frame rate per second (FPS): 30