AMD Ryzen V1500B quad-core 2.2 GHz

CPU

Yes (AES-NI)

Hardware encryption engine

4 GB DDR4 ECC UDIMM (expandable up to 32 GB)

Memory

12 x 3.5" or 2.5" SATA HDD/SSD (drives not included)

Only Synology SAT5200 2.5" or Synology SNV3400/3500 M.2 SSDs (sold reparately) can be used for SSD cache

Compatible drive type

Yes

Hot swappable drive

2 x USB 3.2 Gen 1 ports

1 x Expansion port (Infiniband)

External port

Rackmount 2U

Form factor

RS2421+: 88 x 482 x 552 mm (with server handles)

RS2421RP+: 88 x 482 x 578 mm (with server handles)

Size (Height x Width x Depth)

RS2421+: 11.5 kg

RS2421RP+: 11.9 kg

Weight

4-post 19" rack

Rack installation support

4 x 1GbE RJ-45

LAN port

Yes

Wake on LAN/WAN

1 x 4-lane x8 slot

Supports network interface cards and M.2 NVMe SSD adapter cards for SSD cache

PCIe Expansion

Yes

Scheduled power on/of

3 x (60 x 60 x 38 mm)

System fans

100 V to 240 V AC

AC input power voltage

50/60 Hz, single phase

Power Frequency

0°C to 35°C (32°F to 95°F)

Operating Temperature

-20°C to 60°C (-5°F to 140°F)

Storage Temperature

5% to 95% RH

Relative Humidity

5,000 m (16,400 ft)

Maximum operating altitude

SMB, AFP, NFS, FTP, WebDAV, CalDAV, iSCSI, Telnet, SSH, SNMP, VPN (PPTP, OpenVPN™, L2TP)

Networking protocol

Internal: Btrfs, ext4

External: Btrfs, ext4, ext3, FAT32, NTFS, HFS+, exFAT

File system

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

Supported RAID type

Maximum single volume size: 108TB

Maximum system snapshots: 65,536

Maximum internal volume: 64

Storage management

Read/write cache support

2.5" SATA SSD support

M.2 NVMe SSD support

SSD cache

Maximum local user account: 2,048

Maximum local group: 256

Maximum shared folder: 512

Maximum concurrent SMB/NFS/AFP/FTP connections: 1,000

File sharing capability

Windows Access Control List (ACL), application privileges

Privilege

Connects with Windows AD/LDAP servers enabling domain users to login via SMB/NFS/AFP/FTP/File Station using their existing credentials

Directory service

VMware vSphere, Microsoft Hyper-V, Citrix, OpenStack

Virtualization

Firewall, shared folder encryption, SMB encryption, FTP over SSL/TLS, SFTP, rsync over SSH, login auto block, Let's Encrypt support, and HTTPS (customizable cipher suite)

Security

Windows 7 onwards, macOS 10.12 onwards

Supported clients

Google Chrome, Firefox, Microsoft Edge, Safari 13 and later, and Safari (iOS 13.0 and later) on iPad, Chrome (Android 11.0 and later) on tablets

Supported browser

Offers one or two-way synchronization with public cloud storage providers including Alibaba Cloud OSS, Backblaze B2, Baidu Cloud, Box, Dropbox, Google Cloud Storage, Google Drive, hubiC, MegaDisk, Microsoft OneDrive, OpenStack Swift-compatible storage, Tencent COS, WebDAV servers and Yandex Disk

Cloud Sync

Synchronizes files across Windows, macOS, Linux, Android and iOS. The built-in cross-platform portal allows access to data anytime and anywhere

Maximum number of hosted files: 1,000,000

Maximum number of concurrent connections for PC clients: 550

Drive

Provides virtual drives, remote folders, Windows ACL editor, compression/extraction of archived files, bandwidth control for specific users/groups, creation of sharing links, and transfer logs

File Station

Supports bandwidth control for TCP connections, custom FTP passive port ranges, anonymous FTP, FTP over TLS/SSL and SFTP protocols, network booting with TFTP and PXE support, and transfer logs.

FTP Server

Enables high-speed data transfer over WAN through the exclusive SITA technology between Synology NAS and desktop platforms.

Presto File Server

Enables global search of applications and files.

Universal Search

Maximum number of iSCSI targets: 128

Maximum number of LUNs: 256

iSCSI LUN clone/snapshot support

iSCSI Manager

Deploys and runs virtual machines on the Synology NAS, including Windows, Linux, and Virtual DSM

Virtual Machine Manager

An all-in-one backup solution designed for heterogeneous business IT environments. It enables IT admins to remotely manage and protect PCs, servers, and VMs from one centralized console

Active Backup for Business

Supports backup and restoration of Google Workspace My Drive, Team Drive, Gmail, Contacts, and Calendar

Active Backup for Google Workspace

Supports backup and restoration of Microsoft 365 OneDrive for Business, Outlook, Contacts, and Calendar

Active Backup for Microsoft 365

DSM configuration backup, macOS Time Machine support, Synology Drive Client desktop application

Shared folder sync supports a maximum of 16 tasks

Backup tools

Supports local backup, network backup, and data backup to public clouds.

Hyper Backup

Maximum of shared folder snapshots: 1,024

Maximum of replication: 32

Snapshot Replication

Reduces service downtime by combining two identical NAS into a high-availability cluster

Synology High Availability

Collaborate with instant messaging service Synology Chat, online documents editor Synology Office, and scheduling assistant Synology Calendar

Chat maximum user: 1,500

Office maximum user: 1,800

Calendar: support CalDAV and access via mobile devices

Collaboration tools

A note taking platform that supports rich text, note organization and versioning, encryption, sharing, media embedding, and attachments

Note Station

A secure, reliable, and private mail solution that offers high-availability, load balancing, security, and filtering options.

Synology MailPlus Server

An intuitive webmail interface for Synology MailPlus Server with customizable mail labels, filters, and user interface.

Synology MailPlus

A feature-rich photo management application that includes AI-powered album creation from facial and subject recognition, photo editing and sharing capabilities, similar photo detection for duplicate management, auto-editing functions such as color correction and angle adjustments, and auto-selection of the best shots. Mobile applications are available on iOS and Android devices.

Moments

Video Station, Photo Station, Audio Station, iTunes Server

Other packages

Maximum IP cameras: 40, for a total of 1,200 FPS at 720p (H.264).

Surveillance Station

Provides a single interface to manage and monitor multiple Synology NAS models

Central Management System

Provide a flexible and cost-effective domain controller solution

Synology Directory Server

Maximum connections: 30

Supported VPN protocols: PPTP, OpenVPN, L2TP/IPSec

VPN Server

Supported Mail Server protocols: POP3, SMTP, IMAP

LDAP/AD account support

Mail Server

A webmail interface for Mail Server to receive emails from multiple POP3 mailboxes and SMTP servers.

Mail Station

Enables hosting for up to 30 websites with support for PHP/MariaDB and 3rd-party applications.

Web Station

DNS Server, RADIUS Server, and Log Center

Other packages

Displays volume and quota usage, total size of files, volume usage and trends based on past usage, size of shared folders, large files, most recently modified files, and least recently accessed files.

Storage Analyzer

Provides full system scans, scheduled scans, white list customization, and auto-update of virus definitions.

Antivirus Essential

Synology Drive, Synology MailPlus, Synology Secure SignIn, Synology Chat, Synology LiveCam, Synology Photos, Synology Active Insight, DS audio, DS photo, DS video, DS cam, DS file, DS finder, and DS note

iOS/Android applications

Additional 3rd-party packages are available in the Package Center

Other packages

RoHS compliant

Environment safety

1 x RS2421+/RS2421RP+ main unit

1 x Quick Installation Guide

1 x Accessory pack

RS2421+: 1 x AC power cord

RS2421RP+: 2 x AC power cords

Package content

DDR4 ECC UDIMM: D4EU01-4G/D4EC-2666-8G/D4EC-2666-16G

RKS1317 Rail Kit

10GbE Network Interface Cards: E10G21-F2/E10G18-T2/E10G18-T1

25GbE Network Interface Card: E25G21-F2

M.2 SSD & 10GbE Combo Adapter Card: E10M20-T1

M.2 SSD Adapter Card: M2D20

M.2 NVMe SSD: SNV3400, SNV3500

2.5" SATA SSD: SAT5200

3.5" SATA HDD: HAT5300

Expansion Unit: RX1217(RP)

VisualStation units: VS960HD, VS360HD

MailPlus License Pack

Surveillance Device License Pack

Virtual DSM License Pack

Optional accessories