RackStation RS3621RPxs

High-performance data management solution designed for business-oriented needs.




Safeguard your business assets

Synology RS3621RPxs is a powerful 12-bay storage server. Its 6-core processor enables compute-intensive services while its redundant power, ECC memory, and Btrfs file system safeguard mission-critical data. Capable of delivering 189,098 4K random read IOPS and 4,718 MB/s sequential read throughput1, it is ideal for small businesses.



Intel® Xeon® D-1531 6-core 2.2 GHz


4,718 MB/s seq. read 189,098 4K random read IOPS1


Dual PCIe slots for 10GbE or NVMe cache


Up to 36 drive bays with RX1217(RP)

Reliability first

Service continuity is at the core of the RS3621RPxs design.

Redundant power

Dual PSUs provide protection against a PSU failure or accidental cord removal while hot-swappable fans can be replaced without powering down the system.

Near-zero downtime

Synology High Availability (SHA) pairs two identical units together creating an active-passive cluster with minute-level failover.

Next-generation file system

Btrfs prevents data corruption and reduces maintenance overheads with advanced storage technologies and optimized snapshots.

Customize to suit

The two built-in PCIe slots allow users to customize the RS3621RPxs to satisfy unique performance, networking, and storage requirements2.

  • 10GbE ready

    Support for 10GbE NICs expands the throughput of the unit by up to 5x times using link aggregation.

  • SSD cache3

    Boost read/write IOPS by up to 16 times by enabling SSD cache via our Synology M.2 NVMe adapter cards and SNV3000 Series SSDs or by installing one or more 2.5” SAT5200 SSDs.

  • On-demand drive bays

    Expand to 36 drive bays using two RX1217(RP) expansion units with minimal intervention.

    SSD cache<sup>3</sup>

    License-free backup solutions

    Hyper Backup

    A comprehensive backup and recovery solution for securing data stored on Synology servers. Backup data locally, to another Synology device, rsync server, or cloud-based storage such as Google Drive, Dropbox, S3-compatible destinations, and Synology C2. Deduplication4, integrity checks, and incremental transfer technology reduce bandwidth and storage used.

    Snapshot Replication

    Easily schedule flexible point-in-time backups of shared folders and iSCSI LUNs with an RPO as low as 5 minutes and recovery in seconds. Set up replication and failover to other Synology storage systems for fast RTOs and minimal service disruption.

    Keep disaster at bay

    Storage for virtualization

    Synology iSCSI storage supports mainstream virtualization solutions with an easy management interface to enhance usability. VMware vSphere 6.5 and VAAI integration helps offload storage operations. Windows Offloaded Data Transfer (ODX) speeds up data transfer. OpenStack Cinder support turns your Synology NAS into a block-based storage component. Additionally, Synology Storage Console enables even more simplified storage provisioning and management options in VMware and Windows environments.

    vmware windows2016 citrix openstack

    Powerful built-in surveillance functionality

    Synology Surveillance Station transforms the RS3621RPxs into a feature-packed Network Video Recorder solution. Support for up to 75 IP cameras5 and video analytics such as motion detection, no idle zone, foreign object detection, and anomaly detection cater to the most common surveillance scenarios.

    Secure and private

    AES-256 encryption keeps locally-stored footage secure.

    Access from anywhere, anytime

    Access recordings and live streams whenever you want using a web browser, desktop client, or the DS cam mobile app.

    Real-time alerts

    Email, SMS, or push notifications alert you when incidents occur or predefined conditions are met.

    Works best with Synology drives

    Engineered to handle intensive 24/7 workloads, Synology drives consistently deliver top-grade performance.

    Powered by Synology DiskStation Manager

    The RS3621RPxs runs Synology DiskStation Manager (DSM), the web-based operating system with applications and services designed specifically for businesses.

    Central Management System

    Central Management System

    Conveniently manage your fleet of Synology NAS from a centralized console.

    Synology Drive

    Synology Drive

    Instantly access your NAS files across multiple devices whenever you want, wherever you are.

    Collaboration Suite

    Collaboration Suite

    Satisfy all team collaboration needs behind the safety of your own private cloud with Synology Office, Calendar, and Chat.

    Virtual Machine Manager

    Virtual Machine Manager

    Run various operating systems in isolated sandboxes. Seamlessly clone, store, and migrate virtual machines.



    Secure data with comprehensive built-in security tools to protect your devices against evolving threats.

    Public Cloud Integration

    Public Cloud Integration

    Back up and synchronize data easily between public cloud accounts and your NAS.

    5-year warranty

    At Synology, we are committed to product innovation and quality. The RS3621RPxs is backed by a 5-year limited warranty that includes technical support and hardware replacement services to maximize your return on investment.

    5-year warranty

    5-year warranty

    At Synology, we are committed to product innovation and quality. The RS3621RPxs is backed by a 5-year limited warranty that includes technical support and hardware replacement services to maximize your return on investment.





Data Sheet: RS3621RPxs