12-bay 2U enterprise rackmount NAS
Synology RackStation RS3621xs+ 12-Bay Enterprise Rackmount NAS
The Synology RackStation RS3621xs+ is a 12-bay 2U storage server with an 8-core Intel Xeon processor, expandable ECC memory, built-in dual 10GbE, redundant power and scale-up support to 36 drive bays.
- Processor
- Intel Xeon D-1541
- Memory
- 8 GB DDR4 ECC UDIMM
- Drive bays
- 12 / up to 36 (RX1217 × 2)
- Networking
- 4 × 1GbE RJ-45 plus 2 × 10GbE RJ-45
Build a resilient 2U storage foundation for demanding business services
The RS3621xs+ combines twelve hot-swappable SATA bays with enterprise networking, dual PCIe expansion and a five-year warranty. It suits organisations centralising file services, backup, virtualisation storage and large business datasets while retaining room for capacity and memory growth.
Twelve hot-swappable bays
Install compatible SATA HDDs or SSDs for large shared storage and straightforward drive servicing.
Expand to 36 bays
Two RX1217 expansion units can lift the verified drive-bay count from 12 to 36.
Eight-core Xeon processing
The Intel Xeon D-1541 supplies 8 cores and 16 threads for concurrent business services.
Memory up to 64 GB
The included 8 GB DDR4 ECC UDIMM can be expanded across four verified memory slots.
Dual 10GbE onboard
Two 10GbE and four 1GbE RJ-45 ports provide flexible high-bandwidth network design.
Redundant power and dual PCIe
Redundant PSUs and two Gen3 x8 slots support continuity and compatible I/O expansion.
Who is the Synology RS3621xs+ best for?
A strong choice for
- Business file services and centralised data management
- Backup repositories and recovery workflows
- Virtualisation storage with built-in 10GbE
- Organisations scaling from 12 to 36 bays
- Deployments requiring redundant power
Consider another model if you need
- A short-depth or compact rack enclosure
- Fewer than 12 internal bays
- A lower-power edge NAS
- A dual-controller storage architecture
Key specifications
- Model
- RS3621xs+
- Product type
- 12-bay 2U enterprise rackmount NAS
- Processor
- Intel Xeon D-1541, 8 cores, 16 threads
- CPU frequency
- 2.1 GHz base / 2.7 GHz turbo
- System memory
- 8 GB DDR4 ECC UDIMM
- Maximum memory
- 64 GB (16 GB × 4)
- Drive bays
- 12; up to 36 (RX1217 × 2)
- Drive types
- 12 × 3.5-inch SATA HDD or 2.5-inch SATA SSD
- Networking
- 4 × 1GbE RJ-45 plus 2 × 10GbE RJ-45
- PCIe expansion
- 2 × Gen3 x8 slots (x8 link)
- Dimensions (H × W × D)
- 88 × 482 × 724 mm
- Warranty
- 5 years
Full technical specifications
Processor and memory
| Model | RS3621xs+ |
|---|---|
| CPU model | Intel Xeon D-1541 |
| CPU quantity | 1 |
| CPU cores and threads | 8 cores, 16 threads |
| CPU architecture | 64-bit |
| CPU frequency | 2.1 GHz base / 2.7 GHz turbo |
| Hardware encryption engine | Supported |
| System memory | 8 GB DDR4 ECC UDIMM |
| Pre-installed memory | 8 GB (8 GB × 1) |
| Total memory slots | 4 |
| Maximum memory capacity | 64 GB (16 GB × 4) |
| Memory guidance | Use Synology memory modules and follow the exact-model manual for supported configurations |
Storage, network and expansion
| Drive bays | 12 |
|---|---|
| Maximum drive bays with expansion | 36 (RX1217 × 2) |
| Compatible drive types | 12 × 3.5-inch SATA HDD or 2.5-inch SATA SSD |
| Hot-swappable front drives | Supported |
| Network ports | 4 × 1GbE RJ-45 plus 2 × 10GbE RJ-45 |
| USB ports | 2 × USB 3.2 Gen 1 |
| Expansion connection | 2 × Infiniband |
| PCIe expansion | 2 × Gen3 x8 slots (x8 link) |
| Drive compatibility | Use only drives listed for the exact system on Synology’s current compatibility list |
Physical design and power
| Form factor | 2U |
|---|---|
| Size (H × W × D) | 88 × 482 × 724 mm |
| Weight | 14.5 kg |
| Rack installation | 4-post 19-inch rack; RKS-02 rail kit sold separately |
| System fans | 80 × 80 mm × 4 |
| Fan modes | Full-speed, cool and quiet |
| Noise level | 50.2 dB(A) |
| Power recovery | Supported |
| Power supply unit | 500 W or 550 W depending on hardware revision |
| Redundant power supply | Yes |
| AC input | 100 V to 240 V AC |
| Power frequency | 50/60 Hz, single phase |
| Power consumption | 142.5 W (access); 72.76 W (HDD hibernation) |
| British Thermal Unit | 485.93 BTU/hr (access); 248.11 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, BIS, UL |
| Environment | RoHS compliant |
| Warranty | 5 years |
| Package contents | Main unit × 1; accessory pack × 1; AC power cord × 2; quick installation guide × 1 |
Frequently asked questions about the Synology RS3621xs+
What is the Synology RS3621xs+?
The Synology RS3621xs+ is a 12-bay 2U enterprise rackmount NAS designed for centralised file storage, backup and data management through Synology DSM.
Which processor is in the RS3621xs+?
It uses the Intel Xeon D-1541 with 8 cores, 16 threads, operating at 2.1 GHz base / 2.7 GHz turbo.
How much memory does the RS3621xs+ include?
It includes 8 GB DDR4 ECC UDIMM and supports a verified maximum of 64 GB (16 GB × 4).
How many drive bays does the RS3621xs+ have?
It provides 12 and supports up to 36 (RX1217 × 2).
Which drives are supported by the RS3621xs+?
The verified drive categories are 12 × 3.5-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 RS3621xs+?
The RS3621xs+ includes 4 × 1GbE RJ-45 plus 2 × 10GbE RJ-45.
What expansion is available for the RS3621xs+?
It provides 2 × Gen3 x8 slots (x8 link) plus 2 × Infiniband. Use only options listed for the exact model.
Does the RS3621xs+ have redundant power?
Yes. The RS3621xs+ includes redundant power supplies.
What are the dimensions of the RS3621xs+?
It measures 88 × 482 × 724 mm in height × width × depth and weighs 14.5 kg.
What warranty applies to the RS3621xs+?
Synology specifies 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.
- The power supply is 500 W or 550 W depending on the documented hardware revision; check the serial-number revision and Synology Product Change Notice.
