Synology DiskStation DS1821+ 8-Bay NAS Enclosure Unit
Experience scalable, reliable storage with the Synology DS1821+ featuring an AMD Ryzen quad‑core CPU, 4 GB ECC DDR4 (expandable to 32 GB), dual NVMe slots, and support for up to 18 drives.
Product Overview
The Synology DiskStation DS1821+ is a high-performance eight-bay NAS tailored for small to mid-sized businesses and tech enthusiasts. Equipped with an AMD Ryzen V1500B quad-core processor (2.2 GHz) and 4 GB of ECC DDR4 SODIMM RAM (expandable up to 32 GB), it delivers enterprise-level reliability and performance. With two M.2 NVMe slots for SSD caching, support for DX517 expansion units (up to 18 drive bays total), quad 1 GbE LAN ports, PCIe expansion for 10 GbE, and Synology’s robust DSM platform, it handles demanding workloads such as virtualization, backup, iSCSI, and high-throughput file sharing.
Key Features
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AMD Ryzen V1500B quad-core 2.2 GHz with AES‑NI hardware encryption
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4 GB ECC DDR4 memory pre-installed, upgradable to 32 GB (via two SODIMM slots)
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Eight hot-swappable SATA drive bays; scalable to 18 bays with two DX517 units
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Dual M.2 NVMe slots for SSD cache acceleration
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Four 1 GbE LAN ports supporting link aggregation and failover
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PCIe Gen3 x8 slot (x4 link) for 10 GbE NIC or NVMe adapter expansion
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RAID levels including SHR, RAID 0/1/5/6/10, and JBOD supported
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File system support: Btrfs and EXT4 with snapshot and replication features
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Energy-efficient design using 250 W internal PSU and dual 120 mm cooling fans (~22 dB(A) noise level)
Specs
| Specification | Details |
|---|---|
| CPU | AMD Ryzen V1500B, quad-core 2.2 GHz |
| Memory | 4 GB ECC DDR4 SODIMM (1 × 4 GB), supports up to 32 GB (2×16 GB) |
| Drive Bays | 8 × 3.5″/2.5″ SATA HDD/SSD, hot-swappable |
| Maximum Expansion | Up to 18 bays using two DX517 expansion units |
| M.2 Slots | 2 × NVMe SSD (2280) for cache use only |
| Network Connectivity | 4 × Gigabit Ethernet (Link Aggregation/Failover support) |
| External Ports | 4 × USB 3.2 Gen 1, 2 × eSATA |
| PCIe Expansion | 1 × PCIe Gen3 x8 slot (x4 usable link) |
| RAID Support | SHR, RAID 0/1/5/6/10, JBOD |
| Supported File Systems | Internal: Btrfs, EXT4<br>External: Btrfs, EXT4/3, FAT, NTFS, HFS+, exFAT |
| Cooling & Noise | 2 × 120 mm fans; operating noise ~22 dB(A) |
| Power Consumption | ~59.8 W active; ~26.2 W during HDD hibernation |
| Dimensions & Weight | 343 × 243 × 166 mm; ~6 kg |
| Warranty | 3-year standard coverage |
Why Choose This Product
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Delivers enterprise-grade reliability and performance via ECC memory and Ryzen CPU
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Offers extensive scalability—with NVMe acceleration, RAID flexibility, expansion units, and PCIe support
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Supports advanced features like virtualization, iSCSI, snapshots, storage replication, and surveillance
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Energy-efficient and quiet design suitable for always-on deployment in professional environments
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Backed by Synology’s reliable DSM ecosystem and a three-year hardware warranty
FAQs
Q1: What is the maximum memory supported?
The DS1821+ supports up to 32 GB ECC DDR4 (2 × 16 GB SODIMM modules). It ships with one 4 GB module.
Q2: Can I use non-Synology RAM modules?
Some third-party ECC SODIMMs (e.g., Crucial, Micron) work without errors, but Synology warranty support requires using certified modules.
Q3: Does it support NVMe drives for storage?
Yes—two M.2 NVMe slots are available, but they can only be used for SSD caching, not storage pools.
Q4: Is this a good server for virtualization or Docker workloads?
Yes—especially with upgraded memory and SSD cache, it can support multiple lightweight VMs and containers. Users report handling several VMs reliably.
Q5: How noisy is it during operation?
The DS1821+ operates at approximately 22 dB(A) in quiet or cool fan modes—very tolerable for desktop or office environments.
Q6: Is it suitable for Plex or media streaming workloads?
Plex can operate in direct-play mode, but CPU lacks hardware transcoding—high-resolution streaming or live transcoding is not recommended.
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