48TB, AMD Ryzen V1500B (4x 2.2GHz), 4GB DDR4, 8x 2.5"/3.5" SATA, 2x M.2, 4x RJ-45, 4x USB 3.2 Gen 1, 2x eSATA
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.
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.
Turbocharge and supersize it
Upgrade your DS1821+ to match your data requirements, whether it is for faster networking or for higher storage capacity.
2 x M.2 NVMe
Enable ultra-fast NVMe cache to accelerate HDD arrays by 20X or more
10GbE support
Add in faster SFP+ or RJ-45 networking to turbocharge existing workflows
Storage Expansion
Supports two DX517 expansion units for a total of 18 bays
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.
Hyper Backup
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.
Drive Package
Safeguard your computer with Synology Drive Client. Effortlessly perform real-time data backups and point-in-time file recovery.
Active Backup for Microsoft 365 / Google Workspace
Protect corporate data stored on the cloud. On-premise backup solution with a centralized dashboard. Optimize storage efficiency with single instancing and block-level deduplication technology.
Powered by Synology DiskStation Manager
Central Management System
Conveniently manage your fleet of Synology NAS from a centralized console.
Synology MailPlus
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.
Security
Secure data with comprehensive built-in security tools to protect your devices against evolving threats.
Synology Drive
Instantly access your NAS files across multiple devices whenever you want, wherever you are.
Surveillance Station
Complete surveillance solution for recording, monitoring, and management.
Works best with Synology drives
Engineered to handle intensive 24/7 workloads, Synology drives consistently deliver top-grade performance.
| Storage |
|---|
| Supported file systems |
BTRFS, Fat, HFS+, NTFS, exFAT, ext3, ext4 |
| Hot-swap drive bays |
Yes |
| Online RAID expansion |
Yes |
| Online RAID migration |
Yes |
| RAID levels |
0, 1, 5, 6, 10, JBOD |
| RAID support |
Yes |
| Number of M.2 (M & B) slots |
2 |
| Storage drive sizes supported |
2.5,3.5,M.2 |
| Supported storage drive interfaces |
M.2, Serial ATA II, Serial ATA III |
| Storage drive interface |
Serial ATA III |
| Storage drive capacity |
6 TB |
| Supported storage drive types |
HDD & SSD |
| Installed storage drive type |
HDD |
| Number of storage drives supported |
8 |
| Number of storage drives installed |
8 |
| Total installed storage capacity |
48 TB |
| Storage drives installed |
Yes |
| Processor |
|---|
| Number of processors supported |
1 |
| L3 cache |
4 MB |
| L2 cache |
2 MB |
| Processor threads |
8 |
| Processor cores |
4 |
| Processor frequency |
2.2 GHz |
| Processor model |
V1500B |
| Processor family |
Ryzen Embedded |
| Processor manufacturer |
AMD |
| Memory |
|---|
| ECC |
Yes |
| Memory slots |
2 |
| Memory form factor |
SO-DIMM |
| Maximum RAM supported |
32 GB |
| Internal memory |
4 GB |
| Internal memory type |
DDR4 |
| Network |
|---|
| Supported network protocols |
SMB, AFP, NFS, FTP, WebDAV, CalDAV, iSCSI, Telnet, SSH, SNMP, VPN |
| Link aggregation |
Yes |
| Wake-on-LAN ready |
Yes |
| iSCSI support |
Yes |
| Ethernet LAN data rates |
10,100,1000 Mbit/s |
| Ethernet LAN |
Yes |
| Ports & interfaces |
|---|
| PCI Express x8 (Gen 3.x) slots |
1 |
| eSATA ports quantity |
2 |
| USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity |
4 |
| USB port |
Yes |
| Ethernet LAN (RJ-45) ports |
4 |
| Design |
|---|
| Cable lock slot type |
Kensington |
| Cable lock slot |
Yes |
| LED indicators |
Alarm, HDD, LAN, Power, Status |
| Drive bay locking |
Yes |
| Fan diameter |
12 cm |
| Number of fans |
2 fan(s) |
| Product colour |
Black |
| Cooling type |
Active |
| Chassis type |
Desktop |
| Performance |
|---|
| Built-in FTP server |
Yes |
| System log |
Yes |
| Share folder |
SMB/AFP/NFS/FTP/WebDAV |
| Hot spare |
Yes |
| Security algorithms |
HTTPS, SSH, SSL/TLS |
| Access Control List (ACL) |
Yes |
| Reset button |
Yes |
| On/off switch |
Yes |
| Browser supported |
Chrome, Firefox, Edge, Internet Explorer, Safari |
| Share folder access right management |
Yes |
| Snapshot |
Yes |
| Noise level |
22.2 dB |
| Number of users |
2048 user(s) |
| Multilingual support |
Yes |
| Backup features |
Cloud, iSCSI LUN |
| Backup function |
Yes |
| Device class |
Home & Home Office |
| Type |
NAS |
| Software |
|---|
| Mac operating systems supported |
Yes |
| Windows operating systems supported |
Yes |
| Operating system installed |
DiskStation Manager |
| Power |
|---|
| AC input frequency |
50 - 60 Hz |
| AC input voltage |
100 - 240 V |
| Power consumption (HDD standby) |
26.18 W |
| Power consumption (typical) |
59.8 W |
| Redundant power supply (RPS) support |
No |
| Number of power supply units |
1 |
| Power supply unit (PSU) capacity |
250 W |
| Power supply location |
Built-in |
| general_information_attribute_container_name |
|---|
| attribute_product_family_name |
DiskStation |
| Weight & dimensions |
|---|
| Height |
166 mm |
| Depth |
243 mm |
| Width |
343 mm |
| Packaging content |
|---|
| Power cables quantity |
1 |
| Cables included |
AC, LAN (RJ-45) |
| Technical details |
|---|
| Sustainability compliance |
Yes |
| Sustainability certificates |
BSMI, CCC, CE, EAC, Federal Communications Commission (FCC), KC, RCM, RoHS, UKCA, VCCI |
| Compliance certificates |
BSMI, CCC, CE, EAC, Federal Communications Commission (FCC), KC, RCM, RoHS, UKCA, VCCI |
| Operational conditions |
|---|
| Storage temperature (T-T) |
-20 - 60 °C |
| Storage relative humidity (H-H) |
5 - 95% |
| Operating altitude |
0 - 5000 m |
| Operating relative humidity (H-H) |
5 - 95% |
| Operating temperature (T-T) |
0 - 40 °C |
