RackStation RS4021xs+
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.

Compute
Intel
®
Xeon
®
D-1541 8-core 2.1 GHz

Networking
Built-in dual-port 10GbE

Memory
16 GB ECC DDR4 Up to 64 GB

Scalability
Up to 40 drive bays with RX1217(RP)

5-year warranty
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.
RackStation RS4021xs+

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1
Power button and indicator
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2
Alert Off Button
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3
Drive tray
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4
Drive status indicator
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5
PSU fan
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6
Power Port
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7
PSU Indicators & Alert Off Buttons
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8
Console port
- 1 Power button and indicator
- 2 Alert Off Button
- 3 Drive tray
- 4 Drive status indicator
- 5 PSU fan
- 6 Power Port
- 7 PSU Indicators & Alert Off Buttons
- 8 Console port

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9
1GbE/10GbE RJ-45 Ports
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10
USB 3.2 Ports
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11
Expansion port
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12
PCIe expansion slot
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13
Reset button
- 9 1GbE/10GbE RJ-45 Ports
- 10 USB 3.2 Ports
- 11 Expansion port
- 12 PCIe expansion slot
- 13 Reset button
Notes:
- 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.