High capacity storage and data protection for anyone
Designed for scalability and performance
The 8-bay Synology DS1821+ is aimed at IT enthusiast and SMB customers looking for a powerful and scalable storage solution, its business-grade backup solutions keep users safe and protected from potential data loss, while major improvements to compute capabilities and throughput means workloads are finished faster than ever before.
CPU - AMD Ryzen™ Quad-core 2.2 GHz
Cache Acceleration - Dual M.2 2280 slots for NVMe Cache
Performance - 113K 4K random read IOPS1
Scalability - Expand up to 18 drives with two DX517 expansion units
A powerhouse on all fronts
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.1
Turbocharge and supersize it networking or for higher storage capacity.
2 x M.2 NVMe
Enable ultra-fast NVMe cache to accelerate HDD arrays by 20X or more
Add in faster SFP+ or RJ-45 networking to turbocharge existing workflows
Supports two DX517 expansion units for a total of 18 bays
HDD/SSDs, 10GbE network adapter cards, and expansion units are sold separately.
Ultimate file management and sharing
File Station is a web-based, fast and secure management tool built to allow easy, drag-and-drop operations without requiring any complex setup on Mac or PC. Advanced search and filtering tools allow for easy organization and file sharing. For complete compatibility, DS1821+ supports the following protocols: AFP, FTP, iSCSI, NFS, SMB, and WebDAV.
Fully certified storage virtualization solutions
Synology iSCSI storage fully supports most virtualization solutions to enhance work efficiency with easy management interface. VMware vSphere 6 and VAAI integration helps offload storage operations and optimizes computation efficiency. Windows Offloaded Data Transfer (ODX) speeds up data transfer and migration rate. OpenStack Cinder support turns your Synology NAS into a block-based storage component.
Ultimate Backup Solution
DS1821+ 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
Microsoft 365 / G Suite
On-premise backup solution with a centralized dashboard. Optimize storage efficiency with single instancing and block-level deduplication technology.
Microsoft 365G Suite
Engineered for reliability, backed by Synology
DS1821+ is designed to reliably store your data and is backed by Synology's three-year hardware warranty. An optional two-year extended warranty is available in select regions for up to five years of coverage. Learn more
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.
Works best with Synology solid-state drives
Engineered to handle intensive 24/7 workloads, Synology SSDs are designed to provide consistent high-performance.
SATA 2.5” SSD SAT5200
NVMe M.2 SSD SNV3400
Performance figures are achieved in the Synology lab with optimized network and configuration settings. Actual performance could vary in different environments. Comparison done against prior-generation 8-bay DS1819+. For full details on the test setup, please visit the Synology performance page here.
AMD Ryzen V1500B
4-core 2.2 GHz
Hardware Encryption Engine (AES-NI)
4 GB DDR4 ECC SODIMM
Memory Module Pre-installed
4 GB (4 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.
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
18 (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*
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 expandable up to 108TB.
RJ-45 1GbE LAN Port
4 (with Link Aggregation / Failover support)
USB 3.0 Port
1 x Gen3 x8 slot (x4 link)
exFAT Access is purchased separately in Package Center.
Size (Height x Width x Depth)
166 mm x 343 mm x 243 mm
120 mm x 120 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
59.8 W (Access)
26.18 W (HDD Hibernation)
British Thermal Unit
204.05 BTU/hr (Access)
89.33 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
3-year hardware warranty, extendable to 5-year coverage - EW201
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: D4ES01-4G/D4ES01-8G/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. Each performance test is done individually. No other services or applications are processed at the same time.
The actual performance may be lower than lab testing figure due to differences in server configuration, deployment, and the number of active operations.
If usage requirements exceed the above recommended specifications, please contact us.
| Stock code || IBSY-1821P16C|
| Brand || Synology|
| Series || DiskStation NAS|
| Model || DS1821+ (16GB)|
| Type || 8-Bay, 4x 1GbE, PCIe (16GB non-Synology RAM)|
| ROHS || Y|
| Min Qty || 789|
| Date added || 10/11/2020|
DS1821+ (16GB) Spec Information
| Form Factor / Drive Height || 166 x 343 x 243 mm|
| Platter size || 3.5"|
| Platter (alternate) || 2.5"|
| RAM/Cache || 16GB DDR4|
| Guarantee || 3yr|
| Processor || AMD Ryzen V1500B 4-core 2.2 GHz|
| CPU Mark (cpubenchmark.net) || ? 5000|
| Total Drives || 8|
| Total Drives (alternate) || 8|
| RAID || 0:1:5:6:SHR:|
DS1821+ (16GB) Spec Connections
|PCIe||PCIe v3 x8 (x4)||Internal||1|
DS1821+ (16GB) Speed
| Speed/RPM || 6Gb/s SATA to 1GbE Ethernet|
| Weight (kg) || 10kg|
| Weight (bare) || 6kg|
| Colour || Black|
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Synology DiskStation NAS DS1821+ (16GB) reviews
Would you like to tell us about a lower price for DS1821+ (16GB)?Link to a DS1821+ (16GB) review page Do I have to fill all the bays with drives?
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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