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RS3621XS+, 29RS3621XS+, RS3621xs+, SY40039, 4711174724079

Synology RackStation RS3621xs+



Accelerate your business operations

The 12-bay RS3621xs+ is capable of delivering over 238K 4K random read IOPS and 5,819 MB/s sequential read throughput1 a true enterprise powerhouse. With full power supply redundancy, an 8-core processor, ECC memory, advanced snapshot technology, and file self-healing, the RS3621xs+ provides a reliable foundation to any data-driven business.

Storage you can trust

The RS3621xs+ keeps your data protected while you concentrate on delivering the best results to your customers even when disaster strikes.

Redundant power

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

Maximize service availability

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.

Tailored to your business

The RS3621xs+ includes two PCIe slots for performance, networking, and storage upgrades enabling it to adapt to any business environment.

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.

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.

Complete surveillance solution

Synology Surveillance Station transforms the RS3621xs+ into a feature-packed Network Video Recorder solution. Support for up to 90 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.

Powered by Synology DiskStation Manager

The RS3621xs+ runs Synology DiskStation Manager (DSM), the web-based operating system with applications and services designed specifically for businesses.

5-year warranty

5-year warranty

At Synology, we are committed to product innovation and quality. The RS3621xs+ is backed by a 5-year limited warranty that includes technical support and hardware replacement services to maximize your return on investment.

product RS3621xsplus front view photo

product RS3621xsplus back view photo

  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/10GbE RJ-45 Ports
  10. USB 3.2 Ports
  11. Expansion port
  12. PCIe expansion slot
  13. Reset button



CPU Model

Intel Xeon D-1541

CPU Quantity


CPU Architecture


CPU Frequency

8-core 2.1 (base) / 2.7 (turbo) GHz

Hardware Encryption Engine (AES-NI)


System Memory


Memory Module Pre-installed

8 GB (8 GB x 1)

Total Memory Slots


Maximum Memory Capacity

64 GB (16 GB x 4)


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.

For more information on the recommended memory configurations, visit here.

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


Maximum Drive Bays with Expansion Unit

36 (RX1217/RX1217RP x 2)

Compatible Drive Type* (See all supported drives)



Maximum Single Volume Size*

200 TB (32 GB memory required)

108 TB

Hot Swappable Drive



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 108 TB (with memory less than 32 GB) or 200 TB (with memory equal to or greater than 32 GB).

External Ports

RJ-45 1GbE LAN Port

4 (with Link Aggregation / Failover support)

RJ-45 10GbE LAN Port

2 (with Link Aggregation / Failover support)

USB 3.2 Gen 1 Port*


Expansion Port



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


PCIe Expansion

2 x Gen3 x8 slots (x8 link)

File System

Internal Drives



External Drives









exFAT Access is purchased separately in Package Center.


Form Factor (RU)


Size (Height x Width x Depth)

88 mm x 482 mm x 724 mm


14.5 kg

Rack Installation Support*

4-post 19" rack (Synology Rail Kit - RKS1317)


The rail kit is sold separately


System Fan

80 mm x 80 mm x 4 pcs

Fan Speed Mode

Full-Speed Mode

Cool Mode

Quiet Mode

Easy Replacement System Fan


Power Recovery


Noise Level*

50.2 dB(A)

Scheduled Power On / Off


Wake on LAN / WAN


Power Supply Unit / Adapter

500 W

Redundant Power Supply


AC Input Power Voltage

100 V to 240 V AC

Power Frequency

50/60 Hz, Single Phase

Power Consumption*

142.5 W (Access)

72.76 W (HDD Hibernation)

British Thermal Unit

485.93 BTU/hr (Access)

248.11 BTU/hr (HDD Hibernation)


Power consumption is measured when it is fully loaded with Synology 8TB HAT5300-8T 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: 24.25-25.75C; Humidity: 58.2-61.8%


Operating Temperature

0C to 35C (32F to 95F)

Storage Temperature

-20C to 60C (-5F to 140F)

Relative Humidity

5% to 95% RH












5 Years


The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)


RoHS Compliant

Packaging Content

Main Unit X 1

Accessory Pack X 1

AC Power Cord X 2

Quick Installation Guide X 1

Optional Accessories

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

Expansion Units: RX1217/RX1217RP

3.5" SATA HDD: HAT5300

2.5" SATA SSD: SAT5200

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

M.2 SSD Adapter Card: M2D20

25GbE Network Interface Card: E25G21-F2

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

Rail Kit Sliding: RKS1317

VisualStation: VS960HD/VS360HD

Surveillance Device License Pack


All memory modules will operate at the maximum frequency specified by the CPU manufacturer.

No additional files, specification sheets, guides or documentation found for product.

Warranty: 60 Month Manufacturers Return To Base

Full manufacturers warranty details are available at the manufacturers (Synology) web site.

Unless otherwise specified Techbuy is normally your first point of contact for warranty related returns, further information regarding our warranty policies and consumer guarantees is available on our policies and service & support pages.

To apply for return of a product just go to our returns page.

These terms are in addition to and do not affect any terms, conditions, guarantees and warranties implied by law.

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