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.
High capacity storage and data protection for anyone
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.
DS1821+ 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.
Learn moreComprehensively 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.
Learn moreSafeguard your computer with Synology Drive Client. Effortlessly perform real-time data backups and point-in-time file recovery.
Learn moreProtect 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.
Microsoft 365Google WorkspaceExtend the standard 3-year hardware warranty of your DS1821+ with 2 more years of Synology-certified support and premium services that help you recover faster in the event of disaster.
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.
Engineered to handle intensive 24/7 workloads, Synology drives consistently deliver top-grade performance.
Hardware Specifications |
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CPU |
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CPU
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CPU Model | AMD Ryzen V1500B |
CPU Quantity | 1 | |
CPU Core | 4 | |
CPU Architecture | 64-bit | |
CPU Frequency | 2.2 GHz | |
Hardware Encryption Engine | ||
Memory |
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Memory
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System Memory | 4 GB DDR4 ECC SODIMM |
Memory Module Pre-installed | 4 GB (4 GB x 1) | |
Total Memory Slots | 2 | |
Maximum Memory Capacity | 32 GB (16 GB x 2) | |
Notes |
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Storage |
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Storage
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Drive Bays | 8 |
Maximum Drive Bays with Expansion Unit | 18 (DX517 x 2) | |
M.2 Drive Slots | 2 (NVMe) | |
Drive Type (See all supported drives) |
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Hot Swappable Drive* | ||
Notes | The hot swappable drive feature is not supported by M.2 SSD slots. | |
External Ports |
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External Ports
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RJ-45 1GbE LAN Port | 4 |
USB 3.2 Gen 1 Port* | 4 | |
Expansion Port | 2 | |
Expansion Port Type | eSATA | |
Notes | The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019. | |
PCIe |
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PCIe
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PCIe Expansion | 1 x Gen3 x8 slot (x4 link) |
Appearance |
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Appearance
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Size (Height x Width x Depth) | 166 mm x 343 mm x 243 mm |
Weight | 6 kg | |
Others |
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Others
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System Fan | 120 mm x 120 mm x 2 pcs |
Fan Speed Mode |
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Easy Replacement System Fan | ||
Brightness Adjustable Front LED Indicators | ||
Power Recovery | ||
Noise Level* | 22.2 dB(A) | |
Scheduled Power On / Off | ||
Wake on LAN / WAN | ||
Power Supply Unit / Adapter | 250 watts | |
AC Input Power Voltage | 100V to 240V AC | |
Power Frequency | 50/60 Hz, Single Phase | |
Power Consumption |
59.8 watts (Access) 26.18 watts (HDD Hibernation) |
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British Thermal Unit |
204.05 BTU/hr (Access) 89.33 BTU/hr (HDD Hibernation) |
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Notes |
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Temperature |
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Temperature
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Operating Temperature | 0°C to 40°C (32°F to 104°F) |
Storage Temperature | -20°C to 60°C (-5°F to 140°F) | |
Relative Humidity | 5% to 95% RH | |
Certification |
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Certification
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Warranty |
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Warranty
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3-year hardware warranty, extendable to 5 years with Extended Warranty Plus | |
Notes |
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Environment |
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Environment
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RoHS Compliant | |
Packaging Content |
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Packaging Content
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Optional Accessories |
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Optional Accessories
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Notes | All memory modules will operate at the maximum frequency specified by the CPU manufacturer. |