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)
CPU | CPU Model | Intel Xeon D-1541 |
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CPU Quantity | 1 |
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| CPU Architecture | 64-bit |
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| CPU Frequency | 8-core 2.1 (base) / 2.7 (turbo) GHz |
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| Hardware Encryption Engine (AES-NI) |
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Memory | System Memory | 16 GB DDR4 ECC UDIMM |
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| Memory Module Pre-installed | 16 GB (16 GB x 1) |
| Total Memory Slots | 4 |
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| Maximum Memory Capacity |
64 GB (16 GB x 4) |
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| Notes |
- Synology reserves the right to replace memory modules with the same or higher frequency based on supplier's product life cycle status. Rest assured that the compatibility and stability have been strictly verified with
the same benchmark to ensure identical performance.
- Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if
non-Synology memory modules are used for memory expansion.
- For more information about the recommended memory configurations, please check the Hardware Installation Guide of your Synology product.
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Storage | Drive Bays | 16 |
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Maximum Drive Bays with Expansion Unit | 40 (RX1217/RX1217RP x 2) |
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| Compatible Drive Type |
- 3.5" SATA HDD
- 2.5" SATA SSD
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| Hot Swappable Drive* |
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| Notes | - Synology only guarantees full functionality, reliability,
and performance for Synology drives listed on the compatibility list. The use of non-validated components may limit certain functionality and result in data loss and system instability.
- "Compatible drive type" indicates drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay.
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External Ports | RJ-45 1GbE LAN Port |
4 (with Link Aggregation / Failover support) |
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| RJ-45 10GbE LAN Port | 2 (with Link Aggregation / Failover support) |
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| USB 3.2 Gen 1 Port* | 2 |
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| Expansion Port | 2 |
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| Notes | The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019. |
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PCIe | PCIe Expansion | 2 x Gen3 x8 slots (x8 link) |
File System |
Internal Drives | |
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| External Drives |
- Btrfs
- EXT4
- EXT3
- FAT
- NTFS
- HFS+
- exFAT
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Notes | exFAT Access can be installed for free from Package Center in DSM 7.0. In DSM 6.2 or earlier versions, exFAT Access needs to be purchased in Package Center. |
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Appearance | Form Factor (RU) | 3U |
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Size (Height x Width x Depth) | 132.3 mm x 482 mm x 656.5 mm |
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| Weight | 17.4 kg |
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| Rack Installation Support* | 4-post 19" rack (Synology Rail Kit - RKS-02) |
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Notes | The rail kit is sold separately |
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Others | System Fan | 80 mm x 80 mm x 3 pcs |
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| Fan Speed Mode | - Full-Speed Mode
- Cool Mode
- Quiet Mode
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| Easy Replacement System Fan |
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| Power Recovery | |
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Noise Level* | 44.7 dB(A) |
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| Scheduled Power On / Off |
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| Wake on LAN / WAN | |
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| Power Supply Unit / Adapter | 800 W
550 W |
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| Redundant Power Supply | |
| AC Input Power Voltage | 100 V to 240 V AC |
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| Power Frequency | 50/60 Hz, Single Phase |
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| Power Consumption |
145.79 W (Access)
62.68 W (HDD Hibernation) |
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| British Thermal Unit | 497.14 BTU/hr (Access)
213.74 BTU/hr (HDD Hibernation) |
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| Notes |
- Power supply specifications may differ based on the hardware revision of the device. For more information, refer to the Product Change Notice.
- Power consumption is measured when it is fully loaded with Synology
8TB HAT5300-8T hard drive(s).
- Noise Level Testing Environment: Fully loaded with Seagate 2TB ST2000VN000 hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology NAS at the front and rear.
Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
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Temperature | Operating Temperature | 0°C to 35°C (32°F to 95°F) |
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| Storage Temperature | -20°C to 60°C (-5°F to 140°F) |
| Relative Humidity |
5% to 95% RH |
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