Redundant power
Dual PSUs provide protection against a PSU failure or accidental cord removal while hot-swappable fans allow them to be replaced without powering down the system.
Maximize service availability
Synology High Availability (SHA) pairs two identical units together creating an active-passive cluster with minute-level failover.
Next-generation file system
Btrfs prevents data corruption and reduces maintenance overheads with advanced storage technologies and optimized snapshots.

Tailored to your business
The RS3621xs+ includes two PCIe slots for performance, networking, and storage upgrades enabling it to adapt to any business environment2.
Double bandwidth
Upgrade network bandwidth in minutes by 2x or more with Synology’s range of 10GbE NICs.
SSD cache
Boost read/write IOPS by up to 16 times by enabling SSD cache with our Synology M.2 NVMe adapter cards and SNV3500 SSDs or by installing one or more 2.5” SAT5200 SSDs.
Storage expansion
Quickly and easily scale up to 36 drives with two RX1217(RP) expansion units.

License-free data protection
Hyper Backup
A comprehensive backup and recovery solution for securing data stored on Synology servers. Backup data locally, to another Synology device, rsync server, or cloud-based storage such as Google Drive, Dropbox, S3-compatible destinations, and Synology C2. Deduplication4, integrity checks, and incremental transfer technology reduce bandwidth and storage used.
Snapshot Replication
Easily schedule flexible point-in-time backups of shared folders and iSCSI LUNs with an RPO as low as 5 minutes and recovery in seconds. Set up replication and failover to other Synology storage systems for fast RTOs and minimal service disruption.

RackStation® RS3621xs+


- Power button and indicator
- Alert Off Button
- Drive tray
- Drive status indicator
- Power Port
- PSU Indicators & Alert Off Buttons
- PSU fan
- Console port
- GbE/10GbE RJ-45 Ports
- USB 3.2 Ports
- Expansion port
- PCIe expansion slot
- Reset button
Key Features
- Enterprise-Grade Performance: Powered by an 8-core Intel Xeon D-1541 processor, it delivers the performance needed to handle demanding workloads like virtualization, high-density file sharing, and large-scale backups with exceptional speed.
- Redundant Power Supplies: The “RP” in its name signifies Redundant Power, with two 550W PSUs that protect against service interruption in the event of a power failure, ensuring business continuity.
- High-Speed Networking: It comes equipped with two built-in 10GbE ports and four 1GbE ports, providing a high-bandwidth backbone for fast data transfers. Two PCIe expansion slots also allow for further network upgrades, including 25GbE.
- Reliable and Scalable: With 12 hot-swappable drive bays, it offers a massive storage capacity that can be expanded up to 36 drives by adding expansion units, allowing the system to grow with your data needs.
- Data Integrity: The server uses 8 GB of DDR4 ECC memory (expandable to 64 GB), which automatically detects and corrects data errors, providing crucial data integrity for mission-critical tasks.
- Quiet and Energy-Efficient: Despite its powerful hardware, it operates with a low noise level of 50.2 dB(A) and a power consumption of just 72.76 W in HDD hibernation.
Detailed Specifications
General
- Form Factor: 2U Rackmount
- Number of Bays: 12
- Max Drives with Expansion: 36 (via 2 x RX1217/RP)
- Hot-Swappable: Yes
- RAID Support: Btrfs, EXT4
Computing
- CPU: Intel Xeon D-1541 (8-core, 2.1 – 2.7 GHz)
- RAM: 8 GB DDR4 ECC UDIMM (expandable to 64 GB)
Networking & I/O
- 1GbE Ports: 4 (with Link Aggregation)
- 10GbE Ports: 2 (with Link Aggregation)
- USB Ports: 2 x USB 3.2 Gen 1
- PCIe Expansion: 2 x Gen3 x8 slots
Power
- PSU: 2 x 550W Redundant Power Supply
- Power Consumption: 142.5 W (Access), 72.76 W (HDD Hibernation)
Physical
- Dimensions (HxWxD): 88 x 482 x 724 mm
- Weight: 14.5 kg
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