16-bay 3U redundant-power rackmount NAS
Synology RackStation RS2821RP+ 16-Bay Rackmount NAS
The Synology RackStation RS2821RP+ is a 16-bay 3U storage server with a 4-core AMD Ryzen processor, expandable ECC memory, redundant power and scale-up support to 28 drive bays.
- Processor
- AMD Ryzen V1500B
- Memory
- 4 GB DDR4 ECC UDIMM
- Drive bays
- 16 / up to 28 (RX1217 × 1)
- Networking
- 4 × 1GbE RJ-45
Combine high internal capacity with redundant power for business storage
The RS2821RP+ provides sixteen hot-swappable SATA bays in a 3U enclosure and can expand to 28 bays with one RX1217 unit. It is designed for cost-conscious business file management, backup and data protection where high bay density and power redundancy are important.
Sixteen internal bays
Create a high-capacity SATA storage platform without requiring an expansion unit at initial deployment.
Expand to 28 bays
One RX1217 unit provides twelve additional bays when storage requirements increase.
Ryzen embedded processor
The AMD Ryzen V1500B provides 4 cores and 8 threads at 2.2 GHz.
ECC memory up to 32 GB
The included 4 GB DDR4 ECC UDIMM can be expanded across two memory slots.
PCIe connectivity expansion
The Gen3 x8 slot with x4 link supports compatible network or cache-adapter options.
Redundant 550 W power
Dual power supplies help protect service continuity against a single PSU interruption.
Who is the Synology RS2821RP+ best for?
A strong choice for
- High-capacity business file storage
- Backup and recovery repositories
- Deployments needing 16 internal bays
- Organisations scaling to 28 bays
- Rack environments requiring redundant power
Consider another model if you need
- Built-in 10GbE connectivity
- More than 28 drive bays
- A compact short-depth rack NAS
- A current-generation replacement model
Key specifications
- Model
- RS2821RP+
- Product type
- 16-bay 3U redundant-power rackmount NAS
- Processor
- AMD Ryzen V1500B, 4 cores, 8 threads
- CPU frequency
- 2.2 GHz
- System memory
- 4 GB DDR4 ECC UDIMM
- Maximum memory
- 32 GB (16 GB × 2)
- Drive bays
- 16; up to 28 (RX1217 × 1)
- Drive types
- 16 × 3.5-inch SATA HDD, 2.5-inch SATA HDD or 2.5-inch SATA SSD
- Networking
- 4 × 1GbE RJ-45
- PCIe expansion
- 1 × Gen3 x8 slot (x4 link)
- Dimensions (H × W × D)
- 132.3 × 482 × 656.5 mm
- Warranty
- 3-year hardware warranty, extendable to 5 years
Full technical specifications
Processor and memory
| Model | RS2821RP+ |
|---|---|
| CPU model | AMD Ryzen V1500B |
| CPU quantity | 1 |
| CPU cores and threads | 4 cores, 8 threads |
| CPU architecture | 64-bit |
| CPU frequency | 2.2 GHz |
| Hardware encryption engine | Supported |
| System memory | 4 GB DDR4 ECC UDIMM |
| Pre-installed memory | 4 GB (4 GB × 1) |
| Total memory slots | 2 |
| Maximum memory capacity | 32 GB (16 GB × 2) |
| Memory guidance | Use Synology memory modules and follow the exact-model manual for supported configurations |
Storage, network and expansion
| Drive bays | 16 |
|---|---|
| Maximum drive bays with expansion | 28 (RX1217 × 1) |
| Compatible drive types | 16 × 3.5-inch SATA HDD, 2.5-inch SATA HDD or 2.5-inch SATA SSD |
| Hot-swappable front drives | Supported |
| Network ports | 4 × 1GbE RJ-45 |
| USB ports | 2 × USB 3.2 Gen 1 |
| Expansion connection | 1 × Infiniband |
| PCIe expansion | 1 × Gen3 x8 slot (x4 link) |
| Drive compatibility | Use only drives listed for the exact system on Synology’s current compatibility list |
Physical design and power
| Form factor | 3U |
|---|---|
| Size (H × W × D) | 132.3 × 482 × 656.5 mm |
| Weight | 17.1 kg |
| Rack installation | 4-post 19-inch rack; RKS-02 rail kit sold separately |
| System fans | 80 × 80 mm × 3 |
| Fan modes | Full-speed, cool and quiet |
| Noise level | 53.5 dB(A) |
| Power recovery | Supported |
| Power supply unit | 550 W |
| Redundant power supply | Yes |
| AC input | 100 V to 240 V AC |
| Power frequency | 50/60 Hz, single phase |
| Power consumption | 97.54 W (access); 49.57 W (HDD hibernation) |
| British Thermal Unit | 332.61 BTU/hr (access); 169.03 BTU/hr (HDD hibernation) |
Environment, warranty and package
| Operating temperature | 0°C to 35°C |
|---|---|
| Storage temperature | -20°C to 60°C |
| Operating humidity | 8% to 80% RH |
| Storage humidity | 5% to 95% RH |
| Certifications | FCC, CE, BSMI, VCCI, RCM, EAC, CCC, KC, UL |
| Environment | RoHS compliant |
| Warranty | 3-year hardware warranty, extendable to 5 years |
| Package contents | Main unit × 1; accessory pack × 1; AC power cord × 2; quick installation guide × 1 |
Frequently asked questions about the Synology RS2821RP+
What is the Synology RS2821RP+?
The Synology RS2821RP+ is a 16-bay 3U redundant-power rackmount NAS designed for centralised file storage, backup and data management through Synology DSM.
Which processor is in the RS2821RP+?
It uses the AMD Ryzen V1500B with 4 cores, 8 threads, operating at 2.2 GHz.
How much memory does the RS2821RP+ include?
It includes 4 GB DDR4 ECC UDIMM and supports a verified maximum of 32 GB (16 GB × 2).
How many drive bays does the RS2821RP+ have?
It provides 16 and supports up to 28 (RX1217 × 1).
Which drives are supported by the RS2821RP+?
The verified drive categories are 16 × 3.5-inch SATA HDD, 2.5-inch SATA HDD or 2.5-inch SATA SSD. Confirm the exact drive model on Synology's current compatibility list before purchase.
What network ports are built into the RS2821RP+?
The RS2821RP+ includes 4 × 1GbE RJ-45.
What expansion is available for the RS2821RP+?
It provides 1 × Gen3 x8 slot (x4 link) plus 1 × Infiniband. Use only options listed for the exact model.
Does the RS2821RP+ have redundant power?
Yes. The RS2821RP+ includes redundant power supplies.
What are the dimensions of the RS2821RP+?
It measures 132.3 × 482 × 656.5 mm in height × width × depth and weighs 17.1 kg.
What warranty applies to the RS2821RP+?
Synology specifies 3-year hardware warranty, extendable to 5 years. Warranty coverage starts from the purchase date shown on the receipt, and extension availability varies by region.
- This product is supplied diskless unless the listing explicitly states otherwise; storage drives are sold separately.
- Confirm drives, memory, expansion units, rail kits and add-in cards on Synology’s current compatibility list for the exact model before purchase.
- Actual storage capacity and performance depend on the installed drives, RAID or storage configuration, network and workload.
- This is a legacy catalogue model and the Variant SKU is marked EOL; confirm current availability, compatible components and support arrangements before purchase.
