Designed for scalability and performanceThe 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 frontsThe 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 itUpgrade your DS1821+ to match your data requirements, whether it is for faster networking or for higher storage capacity.2 x M.2 NVMeEnable ultra-fast NVMe cache to accelerate HDD arrays by 20X or more10GbE supportAdd in faster SFP+ or RJ-45 networking to turbocharge existing workflowsStorage ExpansionSupports two DX517 expansion units for a total of 18 baysUltimate file management and sharingFile 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 solutionsSynology 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 SolutionDS1821+ integrates various backup applications into an intuitive user interface, offering durable storage technologies to safeguard your valuable data on any device.Active Backup for BusinessCentralize backup tasks for VMware, Windows, and file servers. Restore whatever you want fast and reliably when needed.Hyper BackupComprehensively 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 PackageSafeguard your computer with Synology Drive Client. Effortlessly perform real-time data backups and point-in-time file recovery.Active Backup for Microsoft 365 / Google WorkspaceProtect 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 ManagerCentral Management SystemConveniently manage your fleet of Synology NAS from a centralized console.Synology MailPlusSecure, reliable, and private mail server solution with an intuitive and modern mail client.Synology High AvailabilitySeamless transition between clustered servers in the event of a server failure to minimize the impact on applications.SecuritySecure data with comprehensive built-in security tools to protect your devices against evolving threats.Synology DriveInstantly access your NAS files across multiple devices whenever you want, wherever you are.Surveillance StationComplete surveillance solution for recording, monitoring, and management.Works best with Synology drivesEngineered to handle intensive 24/7 workloads, Synology drives consistently deliver top-grade performance.
| Storage | |
| Storage drives installed: |  |
| Total installed storage capacity: | 144 TB |
| Number of storage drives installed: | 8 |
| Number of storage drives supported: | 8 |
| Installed storage drive type: | HDD |
| Supported storage drive types: | HDD & SSD |
| Storage drive capacity: | 18000 GB |
| Storage drive interface: | Serial ATA III |
| RAID support: | |
| Supported storage drive interfaces: | M.2, Serial ATA II, Serial ATA III |
| Storage drive size: | 2.5/3.5" |
| Storage drive sizes supported: | 2.5,3.5,M.2 |
| Number of M.2 (M & B) slots: | 2 |
| RAID levels: | 0, 1, 5, 6, 10, JBOD |
| Online RAID migration: | |
| Online RAID expansion: | |
| Hot-swap drive bays: | |
| Supported file systems: | BTRFS, Fat, HFS+, NTFS, exFAT, ext3, ext4 |
| Processor | |
| Processor family: | Ryzen Embedded |
| Processor manufacturer: | AMD |
| Processor model: | V1500B |
| Processor frequency: | 2.2 GHz |
| Processor cores: | 4 |
| Memory | |
| Internal memory: | 4 GB |
| Internal memory type: | DDR4 |
| Maximum RAM supported: | 32 GB |
| Memory slots: | 2 |
| Memory form factor: | SO-DIMM |
| ECC: | |
| Network | |
| Ethernet LAN: | |
| Ethernet LAN data rates: | 10,100,1000 Mbit/s |
| iSCSI support: | |
| Wake-on-LAN ready: | |
| Supported network protocols: | SMB, AFP, NFS, FTP, WebDAV, CalDAV, iSCSI, Telnet, SSH, SNMP, VPN |
| Ports & interfaces | |
| Ethernet LAN (RJ-45) ports: | 4 |
| USB port: | |
| USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity: | 4 |
| eSATA ports quantity: | 2 |
| PCI Express x8 (Gen 3.x) slots: | 1 |
| Design | |
| Chassis type: | Desktop |
| Cooling type: | Active |
| Product colour: | Black |
| Number of fans: | 2 fan(s) |
| Fan diameter: | 12 cm |
| LED indicators: | Alarm, HDD, LAN, Power, Status |
| Cable lock slot: | |
| Cable lock slot type: | Kensington |
| Performance | |
| Type: | NAS |
| Device class: | Home & Home Office |
| Backup function: | |
| Backup features: | Cloud, iSCSI LUN |
| Multilingual support: | |
| Number of users: | 2048 user(s) |
| Noise level: | 22.2 dB |
| Snapshot: | |
| Share folder access right management: | |
| Security algorithms: | HTTPS, SSH, SSL/TLS |
| Access Control List (ACL): | |
| Reset button: | |
| On/off switch: | |
| Built-in FTP server: | |
| Browser supported: | Chrome, Firefox, Edge, Internet Explorer, Safari |
| System log: | |
| Hot spare: | |
| Share folder: | SMB/AFP/NFS/FTP/WebDAV |
| Software | |
| Operating system installed: | DiskStation Manager |
| Windows operating systems supported: | |
| Mac operating systems supported: | |
| Power | |
| Power supply location: | Built-in |
| Power supply unit (PSU) capacity: | 250 W |
| Number of power supply units: | 1 |
| Power consumption (typical): | 59.8 W |
| Power consumption (HDD standby): | 26.18 W |
| AC input voltage: | 100 - 240 V |
| AC input frequency: | 50 - 60 Hz |
| Weight & dimensions | |
| Width: | 343 mm |
| Depth: | 243 mm |
| Height: | 166 mm |
| Packaging content | |
| Cables included: | AC, LAN (RJ-45) |
| Power cables quantity: | 1 |
| Technical details | |
| Sustainability compliance: | |
| Sustainability certificates: | CE, RoHS |
| Operational conditions | |
| Operating temperature (T-T): | 0 - 40 °C |
| Operating relative humidity (H-H): | 5 - 95% |
| Storage temperature (T-T): | -20 - 60 °C |
| Storage relative humidity (H-H): | 5 - 95% |
| Operating altitude: | 0 - 5000 m |
| Certificates | |
| Certification: | FCC, BSMI, EAC, CCC, KC, VCCI, RCM |
