Enterprise NAS with built-in service continuity engineered for data-intensive applications.
Securing your business assets
The 16-bay RS4021xs+ provides solid data security and lightening-fast performance with over 234K 4K random read IOPS and 6,258 MB/s sequential read throughput1. Together with its 8-core processor, ECC memory, advanced snapshot technology, and built-in 10GbE connectivity, the RS4021xs+ can support large multi-user environments while handling data-intensive workloads.
D-1541 8-core 2.1 GHz
Built-in dual-port 10GbE
16 GB ECC DDR4 Up to 64 GB
Up to 40 drive bays with RX1217(RP)
At Synology, we are committed to product innovation and quality.
The RS4021xs+ is backed by a 5-year limited warranty that includes
technical support and hardware replacement services to maximize
your return on investment.
Power button and indicator
Alert Off Button
Drive status indicator
PSU Indicators & Alert Off Buttons
- Power button and indicator
- Alert Off Button
- Drive tray
- Drive status indicator
- PSU fan
- Power Port
- PSU Indicators & Alert Off Buttons
- Console port
1GbE/10GbE RJ-45 Ports
USB 3.2 Ports
PCIe expansion slot
- 1GbE/10GbE RJ-45 Ports
- USB 3.2 Ports
- Expansion port
- PCIe expansion slot
- Reset button
- Performance testing conducted by Synology with 10GbE NICs installed. Actual results may vary depending on system configuration, testing methods, and other environmental variables. Check the performance page for additional details.
- Network adapter cards, expansion units, other PCIe add-in cards, and storage drives are sold separately. Refer to the compatibility list for compatible devices.
- SSD cache can be enabled by using compatible 2.5" SSDs or without occupying drive bays by installing Synology SNV3500 M.2 22110 NVMe SSDs using M2D20 or E10M20-T1 adapter cards, sold separately.
- Users have reported total data size reductions of more than 50% when backing up multiple systems with deduplication technology.
- Surveillance Station includes 2 free licenses. Connecting more cameras and devices requires additional licenses.