On-premises cloud solution built for performance

DS1621xs+ is a high-end NAS with server-class performance in a 6-bay desktop form factor. The built-in M.2 SSD cache slots, 10GbE port, expandable memory, and scalable storage design allow you to boost the performance of your NAS, making it ideal for small and medium-sized businesses that need an efficient and space-saving storage solution.

Intel® Xeon D-1527 4-core 2.2 GHz

8 GB DDR4 ECC SODIMM, up to 32 GB

Over 3,100 MB/s sequential read

Up to 16 drives with DX517
Supercharge your storage with speedy performance

Dual M.2 2280 SSD supporting NVMe SSDs

Built-in 10GBASE-T for bandwidth intensive environments
DS1621xs+ integrates various backup applications into an intuitive user interface, offering durable storage technologies to safeguard your valuable data on any device.

Centralize backup tasks for VMware, Windows, and file servers. Restore whatever you want fast and reliably when needed.

Comprehensively back up your data to a local shared folder, an external device, another Synology NAS, an rsync server, or a public cloud to ensure data safety.

Safeguard your computer with Synology Drive Client. Effortlessly perform real-time data backups and point-in-time file recovery.

On-premise backup solution with a centralized dashboard. Optimize storage efficiency with single instancing and block-level deduplication technology.
Synology Office is a collaboration package combining the convenience and usability of public clouds with the data privacy and security guaranteed by private clouds. It allows you to work seamlessly together on documents and spreadsheets in a protected environment.

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.

Perfectly clone and restore a virtual machine within seconds.

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

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

Conveniently manage your fleet of Synology NAS from a centralized console.

Secure, reliable, and private mail server solution with an intuitive and modern mail client.

Seamless transition between clustered servers in the event of a server failure to minimize the impact on applications.

Secure data with comprehensive built-in security tools to protect your devices against evolving threats.

Instantly access your NAS files across multiple devices whenever you want, wherever you are.

Complete surveillance solution for recording, monitoring, and management.


- 1. Status indicator
- 2. Alert indicator
- 3. Power button and indicator
- 4. LAN indicator
- 5. Drive status indicator
- 6. Drive tray
- 7. Drive tray lock
- 8. USB 3.0 port
- 9. System fan
- 10. Power port
- 11. Kensington Security Slot
- 12. 10GbE RJ-45 port
- 13. 1GbE RJ-45 port
- 14. Reset button
- 15. Expansion port
- 16. PCIe expansion slot






1. DS1621xs+ can be scaled up to 16 drives with 2 x DX517. Synology expansion units are sold separately.