Description
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.
Engineered for service continuity
The RS4021xs+ ensures mission-critical data is always available, enabling businesses to deliver the best results, even in the face of disaster.
Redundant power
Dual PSUs provide protection against a PSU failure or accidental cord removal while hot-swappable fans can 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. Learn more
Next-generation file system
Btrfs prevents data corruption and reduces maintenance overheads with advanced storage technologies and optimized snapshots. Learn more
Storage for virtualization
Synology iSCSI storage supports mainstream virtualization solutions with an easy management interface to enhance usability. VMware vSphere 6.5 and VAAI integration helps offload storage operations. Windows Offloaded Data Transfer (ODX) speeds up data transfer. OpenStack Cinder support turns your Synology NAS into a block-based storage component. Additionally, Synology Storage Console enables even more simplified storage provisioning and management options in VMware and Windows environments. Learn more
All-in-one surveillance solution
Synology Surveillance Station transforms the RS4021xs+ into a feature-packed Network Video Recorder solution. Support for up to 90 IP cameras5 and video analytics such as motion detection, no idle zone, foreign object detection, and anomaly detection cater to the most common surveillance scenarios. Learn more
Secure and private
AES-256 encryption keeps locally-stored footage secure.
Access from anywhere, anytime
Access recordings and live streams whenever you want using a web browser, desktop client, or the DS cam mobile app.
Real-time alerts
Email, SMS, or push notifications alert you when incidents occur or predefined conditions are met.
SPECS
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CPU
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CPU Model | Intel Xeon D-1541 |
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| CPU Quantity | 1 | |
| CPU Core | 8 | |
| CPU Architecture | 64-bit | |
| CPU Frequency | 2.1 (base) / 2.7 (turbo) GHz | |
| Hardware Encryption Engine | YES |
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Memory
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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 | |
| Maximum Memory Capacity | 64 GB (16 GB x 4) |
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Hardware Specifications
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CPU
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CPU Model | Intel Xeon D-1541 |
| CPU Quantity | 1 | |
| CPU Core | 8 | |
| CPU Architecture | 64-bit | |
| CPU Frequency | 2.1 (base) / 2.7 (turbo) GHz | |
| Hardware Encryption Engine | ||
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Memory
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System Memory | 16 GB DDR4 ECC UDIMM |
| Memory Module Pre-installed | 16 GB (16 GB x 1) | |
| Total Memory Slots | 4 | |
| Maximum Memory Capacity | 64 GB (16 GB x 4) | |
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Storage
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Drive Bays | 16 |
| Maximum Drive Bays with Expansion Unit | 40 (RX1217 x 2) | |
| Compatible Drive Type* (See all supported drives) |
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| Hot Swappable Drive* | Yes | |
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External Ports
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RJ-45 1GbE LAN Port | 4 |
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| RJ-45 10GbE LAN Port | 2 | |
| USB 3.2 Gen 1 Port* | 2 | |
| Expansion Port | 2 | |
| Expansion Port Type | Infiniband | |
| 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
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PCIe Expansion | 2 x Gen3 x8 slots (x8 link) |
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Appearance
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Form Factor (RU) | 3U |
| Size (Height x Width x Depth) | 132.3 mm x 482 mm x 656.5 mm | |
| Weight | 17.4 kg | |
| Rack Installation Support* | 4-post 19″ rack (Synology Rail Kit – RKS-02) | |
| Notes | The rail kit is sold separately | |
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Others
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System Fan | 80 mm x 80 mm x 3 pcs |
| Fan Speed Mode |
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| Easy Replacement System Fan | ||
| Power Recovery | ||
| Noise Level* | 44.7 dB(A) | |
| Scheduled Power On / Off | ||
| Wake on LAN / WAN | ||
| Power Supply Unit / Adapter | 800 watts 550 watts* |
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| Redundant Power Supply | Yes | |
| AC Input Power Voltage | 100 V to 240 V AC | |
| Power Frequency | 50/60 Hz, Single Phase | |
| Power Consumption | 145.79 watts (Access) 62.68 watts (HDD Hibernation) |
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| British Thermal Unit | 497.14 BTU/hr (Access) 213.74 BTU/hr (HDD Hibernation) |
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Temperature
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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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Certification
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Warranty
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5 Years | |
| Notes | The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more) | |
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Environment
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RoHS Compliant | |
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Packaging Content
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Optional Accessories
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| Notes | All memory modules will operate at the maximum frequency specified by the CPU manufacturer. | |
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