Synology RS2421+ RackStation 12-Bay Network Storage Enclosure (4GB RAM)

£1,515.00 exc. VAT

Synology RS2421+ 12-Bay NAS Enclosure (4GB RAM)

The Synology RS2421+ RackStation 12-Bay Rackmount NAS features cost-effective file management, sharing, and backup capabilities, specially designed for small business and remote office deployments. Powered by Synology’s DiskStation Manager (DSM), RS2421+ units come with powerful built-in business services and can easily be expanded with SSD cache and 10/25GbE networking capabilities.

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Synology RS2421+ 12-Bay NAS Enclosure (4GB RAM)

Synology RS2421+ RackStation 12-Bay Network Storage Enclosure (4GB RAM)

The Synology RS2421+ RackStation 12-Bay Rackmount NAS features cost-effective file management, sharing, and backup capabilities, specially designed for small business and remote office deployments. Powered by Synology’s DiskStation Manager (DSM), RS2421+ units come with powerful built-in business services and can easily be expanded with SSD cache and 10/25GbE networking capabilities.

Key Features

  • Un-populated twelve (12) bay rackmount network attached NAS storage enclosure
  • Computing Power – AMD Ryzen V1500B quad-core 2.2 GHz
  • High Performance – Support critical workloads with up to 2,200 MB/s read and 1,154 MB/s write performance
  • Memory – 4 GB ECC DDR4, up to 32 GB
  • Scalability – Up to 24 drive bays with RX1217 expansion enclosure (sold separately )
  • High Availability – Combine two devices into a Synology High Availability cluster for maximum service uptime and minute-level failover

Licence-free backup solutions

  • Hyper Backup
    Back up files, iSCSI LUNs, installed applications, and system configurations to destinations including Synology C2 Storage, public cloud platforms, USB devices, file servers, local folders, or other Synology NAS. Set and forget backup tasks with regular schedules, enhance security with fine-grained user permissions and encryption, keep backup sizes small with built-in deduplication, and restore data flexibly with multi-versioning.
  • Snapshot Replication
    Snapshot Replication enables flexible point-in-time snapshots of shared folders and virtual machines with an RPO as low as 5 minutes and recovery within seconds.
  • Active Backup Suite
    Securely back up Windows clients and servers, Microsoft 365 and Google Workspace accounts, file servers, and VMware and Hyper-V virtual machines with the Active Backup Suite.

Serving remote workforces

Keep your remote workforce connected with powerful out-of-the-box solutions for collaboration, file sharing, and communication.

  • Synology Drive
    Host your own private cloud behind the safety of your NAS with 100% data ownership and no subscription fees.
  • Synology Office
    Create documents, spreadsheets, and slides in a multi-user environment. Real-time collaboration and automatic saving make remote work sessions a breeze.
  • Synology Chat
    Discuss and collaborate with colleagues using secure messaging designed for teams, with mobile, desktop, and browser clients.

Storage for virtualisation

DSM streamlines provisioning for and management of virtual machines with full certification for VMware vSphere, Microsoft Hyper-V, Citrix XenServer, and OpenStack virtualisation environments. Synology Storage Console for VMware or Windows platforms lets you manage storage directly from your hypervisor. VMware VAAI integration and Windows ODX help offload storage operations and speed up data transfer.

Powered by Synology DiskStation Manager

The web-based DiskStation Manager (DSM) operating system supports a host of native productivity and management solutions.

  • Central Management System – Conveniently manage your fleet of Synology NAS from a centralised console.
  • Synology Drive – Instantly access your NAS files across multiple devices whenever you want, wherever you are.
  • Collaboration Suite – Satisfy all team collaboration needs behind the safety of your own private cloud with Synology Office, Calendar, and Chat.
  • Virtual Machine Manager – Run various operating systems in isolated sandboxes. Seamlessly clone, store, and migrate virtual machines.
  • Security – Secure data with comprehensive built-in security tools to protect your devices against evolving threats.
  • Surveillance Station – Complete surveillance solution for recording, monitoring, and management.



CPU Model

  • AMD Ryzen V1500B

CPU Quantity

  • 1

CPU Architecture

  • 64-bit

CPU Frequency

  • 4-core 2.2 GHz

Hardware Encryption Engine (AES-NI)    

  • Yes


System Memory


Memory Module Pre-installed

  • 4 GB (4 GB x 1)

Total Memory Slots

  • 2

Maximum Memory Capacity

  • 32 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

  • 12 (un-populated)

Maximum Drive Bays with Expansion Unit (sold separately)

  • 24 (RX1217/RX1217RP x 1)

Compatible Drive Type

  • 3.5″ SATA HDD
  • 2.5″ SATA HDD
  • 2.5″ SATA SSD

Maximum Single Volume Size

  • 108 TB

Hot Swappable Drive   

  • Yes


  • It is strongly recommended that you only install drives listed on your device’s compatibility list. Storage pool and volume creation processes may fail when using unverified drives. Synology is unable to provide technical support for devices using unsupported components.
  • “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.
  • Each internal volume (may consist of multiple drives) is expandable up to 108TB.

External Ports

RJ45 1GbE LAN Port

  • 4 (with Link Aggregation / Failover support)

USB 3.2 Gen 1 Port

  • 2

Expansion Port

  • 1


  • The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019.


PCIe Expansion

  • 1 x Gen3 x8 slot (x4 link)

File System

Internal Drives   

  • Btrfs
  • EXT4

External Drives  

  • Btrfs
  • EXT4
  • EXT3
  • FAT
  • NTFS
  • HFS+
  • exFAT
    • exFAT Access is purchased separately


Form Factor (RU)

  • 2U

Size (Height x Width x Depth)    

  • 88 mm x 482 mm x 552 mm


  • 11.5 kg

Rack Installation Support

  • 4-post 19″ rack


System Fan

  • 60 mm x 60 mm x 3 pcs

Fan Speed Mode    

  • Full-Speed Mode
  • Cool Mode
  • Quiet Mode

Easy Replacement System Fan    

  • Yes

Power Recovery    

  • Yes

Noise Level

  • 50.1 dB(A)

Scheduled Power On / Off    

  • Yes

Wake on LAN / WAN    

  • Yes

Power Supply Unit / Adapter 

  • 500 W

Redundant Power Supply   

  • N/A

Power Frequency   

  • 50/60 Hz, Single Phase

Power Consumption

  • 79.56 W (Access) 34.89 W (HDD Hibernation)

British Thermal Unit    

  • 271.65 BTU/hr (Access) 119.13 BTU/hr (HDD Hibernation)
    • Notes:   
      • 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 metre 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

  • 0°C to 35°C (32°F to 95°F)

Storage Temperature

  • -20°C to 60°C (-5°F to 140°F)

Relative Humidity

  • 5% to 95% RH


  • FCC
  • CE
  • BSMI
  • EAC
  • CCC
  • KC
  • UL
  • VCCI
  • RCM


  • 3 Years


  • RoHS Compliant

DSM Specifications

Storage Management

Maximum Internal Volume Number

  • 64

SSD Read / Write Cache (White Paper)    

  • Yes


  • Yes

Supported RAID Type    

  • Synology Hybrid RAID
  • Basic
  • JBOD
  • RAID 0
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10

RAID Migration    

  • Basic to RAID 1
  • Basic to RAID 5
  • RAID 1 to RAID 5
  • RAID 5 to RAID 6

Volume Expansion with Larger HDDs    

  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10

Volume Expansion by Adding a HDD  

  • Synology Hybrid RAID
  • JBOD
  • RAID 5
  • RAID 6

Global Hot Spare Supported RAID Type    

  • Synology Hybrid RAID
  • RAID 1
  • RAID 5
  • RAID 6
  • RAID 10

File Services

File Protocol


Maximum Concurrent SMB/AFP/FTP Connections

  • 1,000

Maximum Concurrent SMB/AFP/FTP Connections (with RAM expansion)

  • 2,000

Windows Access Control List (ACL) Integration    

  • Yes

NFS Kerberos Authentication    

  • Yes


  • Regarding data concerning tests with RAM expansion, all memory slots are installed with the maximum capacity of supported RAM.
  • The testing standard was based on the maximum number of concurrent connections supported by this model. During the testing, 25% of the connections were used to transfer files concurrently. The transfer process guaranteed that the connections were not interrupted; the minimum transfer speed was not guaranteed.

Account & Shared Folder

Maximum Local User Accounts

  • 2,048

Maximum Local Groups

  • 256

Maximum Shared Folder

  • 512

Maximum Shared Folder Sync Tasks

  • 16

Synology High Availability    

  • Yes

Log Centre – Syslog Events per Second

  • 800


VMware vSphere with VAAI    

  • Yes

Windows Server 2016   

  • Yes

Windows Server 2019    

  • Yes

Citrix Ready 

  • Yes


  • Yes

General Specifications

Networking Protocols

  • SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV

Supported Browsers    

  • Google Chrome
  • Firefox
  • Microsoft Edge
  • Internet Explorer 11 onwards
  • Safari 13 onwards
  • Safari (iOS 13.0 onwards)
  • Google Chrome (Android 11.0 onwards)

Package Contents

  • 1 x Synology RS2421+ Enclosure
  • 1 x Accessory Pack
  • 1 x AC Power Cord
  • 1 x Quick Installation Guide

Standard Warranty: 3-Years

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