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Synology 12 bay RackStation RS3621RPxs (Diskless)

in 30 days
In stock. Limit 2 per customer.
Ships from United States.
  • 4-Bay
  • 12-Bay
  • 16-Bay
  • 8GB
  • 16GB
  • RS4021xs+
  • RS3621xs+
  • RS3621RPxs
  • RS3618xs
  • RS1619xs+
NAS Builder
  • 12-Bay
  • Usage Ultra high prerformance for large number of users
  • Diskless System
  • Intel Xeon D-1531 6-core (12-thread) 2.2GHz Processor
  • 4 x 10/100/1000M
  • 2 x USB 3.2 Gen 1
  • Only drives listed on the compatibility list can be used to create storage pools
  • Only Synology SAT5200 2.5" or Synology SNV3500 series SSDs (sold separately) can be used to create SSD caches
Please note that this product is non-returnable and non-refundable.

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 and 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 five times with 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.


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.


Active Backup Suite

Enables administrators to easily backup the entire IT infrastructure to their NAS, including Windows & Linux workstations and servers, file servers, VMware and Hyper-V virtual machines, and Microsoft 365 and Google Workspace accounts. Backups benefit from deduplication, multiversioning, and optimizations to reduce bandwidth and storage used.


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.


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 caters 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

Conveniently manage your fleet of Synology NAS from a centralized 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.



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


Public Cloud Integration

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

RackStation RS3621RPxs


1. Power button and indicator

2. Alert Off Button

3. Drive tray

4. Drive status indicator

5. Power Port

6. PSU Indicators & Alert Off Buttons

7. PSU fan

8. Console port

9. 1GbE RJ-45 port

10. USB 3.2 Ports

11. Expansion port

12. PCIe expansion slot

13. Reset button

1. Performance testing conducted by Synology with 10GbE NICs installed. Actual results may vary depending on system configuration, testing methods, and other environmental variables. Check the performance page for additional details.
2. Network adapter cards, expansion units, other PCIe add-in cards, and storage drives are sold separately. Refer to the compatibility list for compatible devices.
3. SSD cache can be enabled by using compatible 2.5" SSDs or without occupying drive bays by installing Synology SNV3500 M.2 22110 NVMe SSDs using M2D20 or E10M20-T1 adapter cards, sold separately.
4. Users have reported total data size reductions of more than 50% when backing up multiple systems with deduplication technology.
5. Surveillance Station includes 2 free licenses. Connecting more cameras and devices requires additional licenses.

Warranty & Returns

Warranty, Returns, And Additional Information


  • Limited Warranty period (parts): 5 years
  • Limited Warranty period (labor): 5 years
  • Read full details

Return Policies

  • Return for refund within: non-refundable
  • Return for replacement within: non-replaceable
  • This item is covered by's Manufacturer Only Return Policy. Read full return policy for details.