Synology RackStation RS4021XS-PLUS / RS4021XS+ 16-bay NAS Server

Synology Part #/MPN: RS4021XS+

DiscTech Item #: SYN-RS4021XS-PLUS-BN-5Y

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Interface Types: SATA, USB 3.0 3.1 3.2, Ethernet RJ45, PCIe

Electrical Interface: Ethernet 10Gigabit - 10Gbps

Bays/Ports/Slots: 16

Wattage/VA: 800W

Voltage: 110-240V Multi

Synology RackStation  RS4021XS-PLUS / RS4021XS+ 16-bay SATA Eight-Core Redundant 10GbE 3U Rackmount NAS Server - Diskless - Brand New

Synology RackStation  RS4021XS-PLUS / RS4021XS+ 16-bay SATA Eight-Core Redundant 10GbE 3U Rackmount NAS Server - Diskless - Brand New

Synology RackStation RS4021XS+ Redundant Network Attached Storage Server includes...

  • 2x USB 3.2 ports
  • 4x Ethernet 1GbE RJ45 LAN ports
  • 2x Ethernet 10GbE RJ45 LAN ports
  • Intel® Xeon® D-1541 8-core (16-thread) 2.1 GHz, Turbo Boost up to 2.7 GHz
  • 16 drive bays, expandable to a maximum of 40 bays when paired with an expansion unit
  • 16GB DDR4 ECC Ram, expandable up to 64GB 
  • Accepts 3.5" and 2.5" SATA hard drives and 2.5" SATA solid state drives.

RackStation RS4021xs+
Highly scalable NAS designed for virtualization, data-intensive applications and service continuity for large scale businesses

Powerful storage solution
RS4021xs+ Synology RackStation RS4021xs+ is a powerful 16-bay 3U storage solution designed for high throughput and data integrity, made with built-in redundant power. Equipped with an 8-core processor and upgradable to 64 GB memory, the RS4021xs+ is capable of hosting demanding services involving virtualization, mail, office collaboration, and surveillance, to meet the unique requirements of enterprise

Robust scalability and reliability
Storage capacity of RS4021xs+ can be further scaled up when connected to two Synology Expansion Unit RX1217 or RX1217RP3, providing a total drive number of 40 without disrupting host services.


Accelerated Performance Up to 234,698 random read IOPS and 6,258 MB/s sequential read performance.

Powerful ComputeHost multiple compute-intensive services with its 8-core Intel® processor.

Upgradability Two PCIe expansion slots allow for M.2 NVMe cache adapters and high-bandwidth network cards.

Redundant Power Ensure business continuity with two redundant power supplies.

On-demand Scalability Supports up to 40 drive bays using two RX1217(RP)

Model NumberRS4021XS+ / RS4021XS-PLUS
CPU ModelIntel Xeon D-1541
CPU Architecture64-bit
CPU Frequency8 Core 2.1 (base) / 2.7 (turbo) GHz
Hardware Encryption Engine (AES-NI)Yes
System Memory16 GB DDR4 ECC UDIMM
Memory Module Pre-installed16 GB x 1
Total Memory Slots4
Memory Expandable up to64 GB (16 GB x 4)
Drive Bay(s)16
Maximum Drive Bays with Expansion Unit40
Compatible Drive Type3.5in SATA HDD
2.5in SATA HDD
2.5in SATA SSD
Maximum Single Volume Size
  • 200 TB (32GB RM required, for RAID 5 or RAID 6 groups only)
  • 108 TB
  • Hot Swappable DriveYes
    Internal DrivesBtrfs
    External DrivesBtrfs
    exFAT (purchased separately)
    Size (Height x Width x Depth)132.3 mm x 482 mm x 656.5 mm
    Weight17.4 kg
    RJ-45 1GbE LAN Port4 (with Link Aggregation / Failover support)
    RJ-45 10GbE LAN Port2 (with Link Aggregation / Failover support)
    PCIe Slot for Network Card2 x Gen3 x8 slots (x8 link)
    System Fan80 mm x 80 mm x 3 pcs
    Fan Speed ModeFull-Speed Mode
    Cool Mode
    Quiet Mode
    Easy Replacement System FanYes
    Noise Level44.7 dB(A)
    Power RecoveryYes
    Scheduled Power On/OffYes
    Power Supply Unit / Adapter2 x 800W
    AC Input Power Voltage100V to 240V AC
    Power Frequency50/60 HZ, Single Phase
    Redundant Power SupplyYes
    Operating Temperature5°C to 35°C
    (40°F to 95°F)
    Storage Temperature-20°C to 60°C
    (-5°F to 140°F)
    Relative Humidity5% to 95% RH
    CertificationFCC Class A
    CE Class A
    BSMI Class A

    Click here to view the manufacturer's item description/brochure

    ROHS Compliant

    Alternate MPNs: RS4021XSPLUS RS4021XS-PLUS

    Weight: 40 lb

    Warranty: 5 Year Manufacturer

    Brand New

    Condition Levels Explained

    The product is brand new.

    5 Year Manufacturer Warranty

    Product Warranties Explained

    The product has a manufacturer warranty for the time period specified.