Secure storage for your business

Synology RS2421+/RS2421RP+ are versatile 2U 12-bay storage servers designed to accommodate a diverse set of business environments. Scalable up to 24 drives, they are designed for cost-effective file management and sharing and include powerful backup capabilities designed for businesses with a growing data footprint. The unit delivers 2,200 MB/s 64K sequential read and 1154 MB/s sequential write performance۱, and can be optionally enhanced with SSD cache and 10/25Gb Ethernet۲.


Up to 24 drive bays with RX1217(RP)



۴ GB ECC DDR4, up to 32 GB


۲,۲۰۰ MB/s seq. read and 1154 MB/s seq. write performance۱


AMD Ryzen V1500B quad-core 2.2 GHz

CPU Model AMD Ryzen V1500B
  CPU Quantity ۱
  CPU Architecture ۶۴-bit
  CPU Frequency ۴-core 2.2 GHz
  Hardware Encryption Engine (AES-NI)  
System Memory ۴ GB DDR4 ECC UDIMM
  Memory Module Pre-installed ۴ GB (4 GB x 1)
  Total Memory Slots ۲
  Maximum Memory Capacity ۳۲ GB (16 GB x 2)
  • 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.
  • 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.
Drive Bays ۱۲
  Maximum Drive Bays with Expansion Unit ۲۴ (RX1217/RX1217RP x 1)
  Compatible Drive Type* (See all supported drives)
  • ۳.۵″ SATA HDD
  • ۲.۵″ SATA HDD
  • ۲.۵″ SATA SSD
  Hot Swappable Drive  
  • 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)
  USB 3.2 Gen 1 Port* ۲
  Expansion Port ۱
  Notes The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019.
PCIe Expansion ۱ x Gen3 x8 slot (x4 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.
Form Factor (RU) ۲U
  Size (Height x Width x Depth) RS2421+ :۸۸ mm x 482 mm x 552 mmRS2421RP+ :۸۸ mm x 482 mm x 578 mm
  Weight RS2421+ :۱۱.۵ kgRS2421RP+ :۱۱.۹ kg
  Rack Installation Support* ۴-post 19″ rack (Synology Rail Kit – RKS-02)
  Notes The rail kit is sold separately
System Fan ۶۰ mm x 60 mm x 3 pcs
  Fan Speed Mode
  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode
  Easy Replacement System Fan  
  Power Recovery  
  Noise Level* RS2421+ :۵۰.۱ dB(A)RS2421RP+ :۵۴ dB(A)
  Scheduled Power On / Off  
  Wake on LAN / WAN  
  Power Supply Unit / Adapter RS2421+ :۵۰۰ WRS2421RP+ :۳۵۰ W
  Redundant Power Supply RS2421+ :RS2421RP+ :
  AC Input Power Voltage ۱۰۰V to 240V AC
  Power Frequency ۵۰/۶۰ Hz, Single Phase
  Power Consumption* RS2421+ :۷۹.۵۶ W (Access) ۳۴.۸۹ W (HDD Hibernation)
RS2421RP+ :۹۱.۷۶ W (Access) ۴۸.۲۱ W (HDD Hibernation)
  British Thermal Unit RS2421+ :۲۷۱.۶۵ BTU/hr (Access) ۱۱۹.۱۳ BTU/hr (HDD Hibernation)
RS2421RP+ :۳۱۳.۳۱ BTU/hr (Access) ۱۶۴.۶۱ BTU/hr (HDD Hibernation)
  • Power consumption is measured when it is fully loaded with Western Digital 1TB WD10EFRX 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%
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
  • FCC
  • CE
  • BSMI
  • EAC
  • CCC
  • KC
  • UL
  • VCCI
  • RCM
۳-year hardware warranty, extendable to 5-year coverage – EW202
  Notes The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
RoHS Compliant
Packaging Content
RS2421+ :

  • Main Unit X 1
  • Accessory Pack X 1
  • AC Power Cord X 1
  • Quick Installation Guide X 1

RS2421RP+ :

  • 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


Hardware Installation Guide




RackStation RS1221+​/​RS1221RP+

۱۶-Reset button

۱۷-PCIe expansion slot

۱۱-PSU on/off switch

۱۲-Console port

۱۳-۱GbE RJ-45 port

۱۴-USB 3.2 Ports

۱۵-Expansion port

۶-Drive status indicator

۷-Rail Kit Release Tab

۸-Power Port

۹-PSU Indicators & Alert Off Buttons (RS2421RP+)

۱۰-PSU fan

۱-Power button and indicator

۲-Status Indicator

۳-Alert Indicator

۴-Alert Off Button

۵-Drive tray