On-premises cloud solution built for performance
High-end scalable NAS in desktop form factor
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.
CPU - Intel® Xeon D-1527 4-core 2.2 GHz
Memory - 8 GB DDR4 ECC SODIMM, up to 32 GB
High Performance - Over 3,100 MB/s sequential read
Scalability - Up to 16 drives with DX517
Supercharge your storage with speedy performance
DS1621xs+ comes with built-in M.2 SSD cache slots capable of providing I/O response speeds 20 times faster than hard drives without occupying front drive bays. The built-in 10GbE port provides fast data transmission and can be bonded with an additional network interface card for higher network bandwidth.
M.2 SSD support
Dual M.2 2280 SSD supporting NVMe SSDs
Built-in 10GBASE-T for bandwidth intensive environments
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.
Ultimate Backup Solution
DS1621xs+ integrates various backup applications into an intuitive user interface, offering durable storage technologies to safeguard your valuable data on any device.
Active Backup for Business
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.
Active Backup for
Office 365 / G Suite
On-premise backup solution with a centralized dashboard. Optimize storage efficiency with single instancing and block-level deduplication technology.
Office 365 G Suite
Real-time collaboration on your private cloud
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. Learn more
Real-time collaboration on the same online documents to boost productivity,
Instant communication on Synology Chat during the editing of documents or spreadsheets
Version control for you to navigate all the changes and retrieve previous versions with just a click
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. Learn more
Snapshots for virtual machines
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.
Powered by Synology DSM
Central Management System
Manage multiple Synology NAS servers simultaneously on a centralized interface to increase business efficiency.
Secure, reliable, and private mail server solution with an intuitive and modern mail client.
Synology High Availability
Seamless transition between clustered servers in the event of a server failure to minimize the impact on applications.
Comprehensive built-in security tools are constantly updated to protect your devices against evolving threats.
A versatile solution for file management and synchronization.
Complete surveillance solution for recording, monitoring, and management.
Intel Xeon D-1527
4-core 2.2 (base) / 2.7 (turbo) GHz
Hardware Encryption Engine (AES-NI)
8 GB DDR4 ECC SODIMM
Memory Module Pre-installed
8 GB (8 GB x 1)
Total Memory Slots
Maximum Memory Capacity
32 GB (16 GB x 2)
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.
For more information on the recommended memory configurations, visit here.
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.
Maximum Drive Bays with Expansion Unit
16 (DX517 x 2)
M.2 Drive Slots
Compatible Drive Type* (See all supported drives)
3.5" SATA HDD
2.5" SATA HDD
2.5" SATA SSD
M.2 2280 NVMe SSD
Maximum Single Volume Size*
200 TB (32 GB RAM required, for RAID 5 or RAID 6 groups only)
Hot Swappable Drive
"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.
Each internal volume (may consist of multiple drives) is expandble up to 108TB (with memory less than 32GB) or 200TB (with memory equal to or greater than 32GB).
RJ-45 1GbE LAN Port
2 (with Link Aggregation / Failover support)
RJ-45 10GbE LAN Port
USB 3.0 Port
1 x Gen3 x8 slot (x8 link)
exFAT Access is purchased separately in Package Center.
Size (Height x Width x Depth)
166 mm x 282 mm x 243 mm
92 mm x 92 mm x 2 pcs
Fan Speed Mode
Easy Replacement System Fan
Brightness Adjustable Front LED Indicators
Scheduled Power On / Off
Wake on LAN / WAN
Power Supply Unit / Adapter
AC Input Power Voltage
100 V to 240 V AC
50/60 Hz, Single Phase
62.85 W (Access)
34.26 W (HDD Hibernation)
British Thermal Unit
214.45 BTU/hr (Access)
116.89 BTU/hr (HDD Hibernation)
Power consumption is measured when it is fully loaded with Western Digital 1TB WD10EFRX hard drive(s).
Noise Level Testing Environment: Fully loaded with Seagate 2TB ST2000VN000 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%
0°C to 40°C (32°F to 104°F)
-20°C to 60°C (-5°F to 140°F)
5% to 95% RH
The warranty period starts from the purchase date as stated on your purchase receipt.
Main Unit X 1
Accessory Pack X 1
AC Power Cord X 1
RJ-45 LAN Cable X 2
Quick Installation Guide X 1
DDR4 ECC SODIMM: D4ES01-8G
DDR4 ECC SODIMM: D4ECSO-2666-16G
Expansion Units: DX517
2.5" SATA SSD: SAT5200
M.2 2280 NVMe SSD: SNV3400
10GbE Network Interface Card: E10G18-T2/E10G18-T1/E10G17-F2
Surveillance Device License Pack
All memory modules will operate at the maximum frequency specified by the CPU manufacturer.
Model specifications are subject to change without prior notice.
The figures are based on Synology internal testing. No other services or applications are processed during the performance tests.
| Stock code || IBSY-1621XSP16|
| Brand || Synology|
| Series || DiskStation NAS|
| Model || DS1621xs+ (16GB ECC)|
| Type || 6-Bay, 2x 1GbE, 10GbE RJ45, 2x M2 NVMe, PCIe (16GB ECC RAM)|
| ROHS || Y|
| Date added || 27/08/2020|
DS1621xs+ (16GB ECC) Spec Information
| Form Factor / Drive Height || 166 x 282 x 243 mm|
| Platter size || 3.5"|
| Platter (alternate) || 2.5"|
| RAM/Cache || 16GB DDR4 ECC|
| Guarantee || 5yr|
| Processor || Intel Xeon D-1527 Quad Core 2.2 GHz (2.7 GHz turbo)|
| CPU Mark (cpubenchmark.net) || ? 8000|
| Total Drives || 6|
| Total Drives (alternate) || 6|
| RAID || 0:1:5:6:F1:|
DS1621xs+ (16GB ECC) Spec Connections
|Expansion Port||Expansion Port||External||2|
|PCIe||PCIe v3 x8||External||1|
DS1621xs+ (16GB ECC) Speed
| Speed/RPM || 6Gb/s SATA to 1GbE and 10GbE Ethernet|
| Weight (kg) || 7kg|
| Weight (bare) || 5.3kg|
| Colour || Black|
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Synology DiskStation NAS DS1621xs+ (16GB ECC) reviews
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20/12/2020 | Guest
You can start with any number of drives, and leave some room for future expansion. We recommend that you use exactly the same make and model of drive when expanding your RAID.
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