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 throughput۱. 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.

Scalability

Up to 40 drive bays with RX1217(RP)

Memory

۱۶ GB ECC DDR4 Up to 64 GB

Networking

Built-in dual-port 10GbE

Compute

Intel® Xeon® D-1541 8-core 2.1 GHz

CPU
 CPU Model Intel Xeon D-1541
  CPU Quantity ۱
  CPU Architecture ۶۴-bit
  CPU Frequency ۸-core 2.1 (base) / 2.7 (turbo) GHz
  Hardware Encryption Engine (AES-NI)  
Memory
 System Memory ۱۶ GB DDR4 ECC UDIMM
  Memory Module Pre-installed ۱۶ GB (16 GB x 1)
  Total Memory Slots ۴
  Maximum Memory Capacity ۶۴ GB (16 GB x 4)
  Notes
  • 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 on the recommended memory configurations, visit here.
  • 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.
Storage
 Drive Bays ۱۶
  Maximum Drive Bays with Expansion Unit ۴۰ (RX1217/RX1217RP x 2)
  Compatible Drive Type* (See all supported drives)
  • ۳.۵″ SATA HDD
  • ۲.۵″ SATA SSD
  Hot Swappable Drive  
  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.
External Ports
 RJ-45 1GbE LAN Port ۴ (with Link Aggregation / Failover support)
  RJ-45 10GbE LAN Port ۲ (with Link Aggregation / Failover support)
  USB 3.2 Gen 1 Port* ۲
  Expansion Port ۲
  Notes The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019.
PCIe
 PCIe Expansion ۲ x Gen3 x8 slots (x8 link)
File System
 Internal Drives
  • Btrfs
  • EXT4
  External Drives
  • Btrfs
  • EXT4
  • EXT3
  • FAT
  • NTFS
  • HFS+
  • exFAT
  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.
Appearance
 Form Factor (RU) ۳U
  Size (Height x Width x Depth) ۱۳۲.۳ mm x 482 mm x 656.5 mm
  Weight ۱۷.۴ kg
  Rack Installation Support* ۴-post 19″ rack (Synology Rail Kit – RKS-02)
  Notes The rail kit is sold separately
Others
 System Fan ۸۰ mm x 80 mm x 3 pcs
  Fan Speed Mode
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
  Easy Replacement System Fan  
  Power Recovery  
  Noise Level* ۴۴.۷ dB(A)
  Scheduled Power On / Off  
  Wake on LAN / WAN  
  Power Supply Unit / Adapter ۸۰۰ W
۵۵۰ W
  Redundant Power Supply  
  AC Input Power Voltage ۱۰۰ V to 240 V AC
  Power Frequency ۵۰/۶۰ Hz, Single Phase
  Power Consumption* ۱۴۵.۷۹ W (Access)
۶۲.۶۸ W (HDD Hibernation)
  British Thermal Unit ۴۹۷.۱۴ BTU/hr (Access)
۲۱۳.۷۴ BTU/hr (HDD Hibernation)
  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%
Temperature
 Operating Temperature ۰°C to 35°C (32°F to 95°F)
  Storage Temperature -۲۰°C to 60°C (-5°F to 140°F)
  Relative Humidity ۵% to 95% RH
Certification
  • FCC
  • CE
  • BSMI
  • VCCI
  • RCM
  • EAC
  • CCC
  • KC
  • UL
Warranty
 ۵ Years
  Notes The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
Environment
 RoHS Compliant
Packaging Content
  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Cord X 2
  • Quick Installation Guide X 1
Optional Accessories
  Notes All memory modules will operate at the maximum frequency specified by the CPU manufacturer.

Synology Assistant

Downloads

Operating System(DSM)

Downloads

Hardware Installation Guide

Downloads

Datasheet

Downloads

RackStation RS4021xs+

۱۳-Reset button

۹-۱GbE/10GbE RJ-45 Ports

۱۰-USB 3.2 Ports

۱۱-Expansion port

۱۲-PCIe expansion slot

۵-PSU fan

۶-Power Port

۷-PSU Indicators & Alert Off Buttons

۸-Console port

۱-Power button and indicator

۲-Alert Off Button

۳-Drive tray

۴-Drive status indicator