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.
Double bandwidth
Upgrade network bandwidth in minutes by 2x or more with Synology’s range of 10GbE NICs.
SSD cache
Boost read/write IOPS by up to 16 times by enabling SSD cache with our Synology M.2 NVMe adapter cards and SNV3500 SSDs or by installing one or more 2.5” SAT5200 SSDs.
Storage expansion
Quickly and easily scale up to 36 drives with two RX1217(RP) expansion units.
License-free data protection
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. Deduplication, 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.
Complete surveillance solution
Synology Surveillance Station transforms the RS3621xs+ into a feature-packed Network Video Recorder solution. Support for up to 90 IP cameras 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 adds additional security to the locally-stored footage.
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 RS3621xs+ 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.
Security
Shield your Synology NAS from the most sophisticated threats with industry-leading security solutions.
Public Cloud Integration
Back up and synchronize data easily between public cloud accounts and your NAS.
Specifications
| Storage |
| Supported file systems |
BTRFS, Fat, HFS+, NTFS, exFAT, ext3, ext4 |
| Hot-swap drive bays |
Yes |
| Online RAID expansion |
Yes |
| Online RAID migration |
Yes |
| RAID levels |
0, 1, 5, 6, 10, F1, JBOD |
| RAID support |
Yes |
| HDD speed |
7200 RPM |
| Storage drive sizes supported |
2.5,3.5" |
| Storage drive size |
3.5" |
| Supported storage drive interfaces |
Serial ATA II, Serial ATA III |
| Storage drive interface |
Serial ATA III |
| Storage drive capacity |
16 TB |
| Supported storage drive types |
HDD & SSD |
| Installed storage drive type |
HDD |
| Number of storage drives supported |
12 |
| Number of storage drives installed |
12 |
| Total installed storage capacity |
192 TB |
| Storage drives installed |
Yes |
| Processor |
| Conflict-Free processor |
Yes |
| CPU configuration (max) |
1 |
| Processor cache |
12 MB |
| Processor threads |
16 |
| Processor cores |
8 |
| Processor boost frequency |
2.7 GHz |
| Processor frequency |
2.1 GHz |
| Processor model |
D-1541 |
| Processor family |
Intel® Xeon® D |
| Processor manufacturer |
Intel |
| Memory |
| ECC |
Yes |
| Memory form factor |
UDIMM |
| Memory slots |
4 |
| Maximum RAM supported |
64 GB |
| Memory clock speed |
2666 MHz |
| Internal memory type |
DDR4 |
| Internal memory |
8 GB |
| Network |
| Link aggregation |
Yes |
| Supported network protocols |
SMB, AFP, NFS, FTP, WebDAV, CalDAV, iSCSI, Telnet, SSH, SNMP, VPN |
| Wake-on-LAN ready |
Yes |
| iSCSI support |
Yes |
| Ethernet LAN data rate supported (max) |
10000 Mbit/s |
| Ethernet LAN data rates |
10,100,1000,10000 Mbit/s |
| Ethernet LAN |
Yes |
| Ports & interfaces |
| PCI Express x8 (Gen 3.x) slots |
2 |
| USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity |
2 |
| USB port |
Yes |
| Ethernet LAN (RJ-45) ports |
6 |
| Design |
| LED indicators |
Yes |
| Fan diameter |
8 cm |
| Number of fans |
4 fan(s) |
| Product colour |
Black |
| Cooling type |
Active |
| Chassis type |
Rack (2U) |
| Performance |
| Access Control List (ACL) |
Yes |
| Browser supported |
Chrome, Firefox, Edge, Internet Explorer, Safari |
| Built-in FTP server |
Yes |
| Hot spare |
Yes |
| On/off switch |
Yes |
| Password authentication |
Yes |
| Reset button |
Yes |
| Security algorithms |
HTTPS, SSH, SSL/TLS |
| Share folder |
CIFS/AFP/NFS/FTP/WebDAV |
| System log |
Yes |
| Web-based management |
Yes |
| Snapshot |
Yes |
| Third-party support |
Yes |
| Noise level |
50.2 dB |
| Multilingual support |
Yes |
| Backup features |
Cloud, iSCSI LUN |
| Backup function |
Yes |
| Device class |
Small & Medium Business |
| Type |
NAS |
| Software |
| Mac operating systems supported |
Yes |
| Windows operating systems supported |
Yes |
| Operating system installed |
DiskStation Manager |
| Power |
| AC input frequency |
50 - 60 Hz |
| AC input voltage |
100 - 240 V |
| Power consumption (HDD standby) |
72.76 W |
| Power consumption (typical) |
142.5 W |
| Redundant power supply (RPS) support |
Yes |
| Power supply unit (PSU) capacity |
500 W |
| Power supply location |
Built-in |
| Weight & dimensions |
| Height |
88 mm |
| Depth |
724 mm |
| Width |
482 mm |
| Packaging content |
| Power cables quantity |
2 |
| Cables included |
AC |
| Processor special features |
| Embedded options available |
No |
| Enhanced Intel SpeedStep Technology |
Yes |
| Execute Disable Bit |
Yes |
| Idle States |
Yes |
| Intel 64 |
Yes |
| Intel Enhanced Halt State |
Yes |
| Intel Secure Key Technology version |
1.00 |
| Intel TSX-NI |
Yes |
| Intel TSX-NI version |
1.00 |
| Intel Trusted Execution Technology |
Yes |
| Intel VT-x with Extended Page Tables (EPT) |
Yes |
| Intel Virtualization Technology (VT-x) |
Yes |
| Intel Virtualization Technology for Directed I/O (VT-d) |
Yes |
| Sustainability |
| Sustainability compliance |
Yes |
| Sustainability certificates |
RoHS, Federal Communications Commission (FCC), CCC, CE |
| Operational conditions |
| Operating altitude |
0 - 5000 m |
| Storage relative humidity (H-H) |
5 - 95% |
| Storage temperature (T-T) |
-20 - 60 °C |
| Operating relative humidity (H-H) |
5 - 95% |
| Operating temperature (T-T) |
0 - 35 °C |
| Other features |
| Compliance certificates |
RoHS |
