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. More information: Performance | Type | NAS |  | Device class | Small & Medium Business | | Backup function | Yes | | Backup features | Cloud, iSCSI LUN | | Multilingual support | Yes | | Noise level | 50.2 dB | | Third-party support | Yes | | Snapshot | Yes | | Web-based management | Yes | | Security algorithms | HTTPS, SSH, SSL/TLS | | Access Control List (ACL) | Yes | | Reset button | Yes | | On/off switch | Yes | | Built-in FTP server | Yes | | Browser supported | Chrome, Firefox, Edge, Internet Explorer, Safari | | System log | Yes | | Hot spare | Yes | | Password authentication | Yes | | Share folder | CIFS/AFP/NFS/FTP/WebDAV | Technical details | Sustainability compliance | Yes | | Sustainability certificates | CCC, CE, Federal Communications Commission (FCC), RoHS | Design | Chassis type | Rack (2U) | | Cooling type | Active | | Product colour | Black | | Number of fans | 4 fan(s) | | Fan diameter | 80 mm | | LED indicators | Yes | Processor | Processor family | Intel® Xeon® D | | Processor manufacturer | Intel | | Processor model | D-1541 | | Processor frequency | 2.1 GHz | | Processor boost frequency | 2.7 GHz | | Processor cores | 8 | | Processor threads | 16 | | Processor cache | 12 MB | | CPU configuration (max) | 1 | | Conflict-Free processor | Yes | Software | Operating system installed | DiskStation Manager | | Windows operating systems supported | Yes | | Mac operating systems supported | Yes | Memory | Internal memory | 8 GB | | Internal memory type | DDR4 | | Memory clock speed | 2666 MHz | | Maximum RAM supported | 64 GB | | Memory slots | 4 | | Memory form factor | UDIMM | | ECC | Yes | Power | Power supply location | Built-in | | Power supply unit (PSU) capacity | 500 W | | Redundant power supply (RPS) support | Yes | | Power consumption (typical) | 142.5 W | | Power consumption (HDD standby) | 72.76 W | | AC input voltage | 100 - 240 V | | AC input frequency | 50 - 60 Hz | Network | Ethernet LAN | Yes | | Ethernet LAN data rates | 10,100,1000,10000 Mbit/s | | Ethernet LAN data rate supported (max) | 10000 Mbit/s | | iSCSI support | Yes | | Wake-on-LAN ready | Yes | | Supported network protocols | SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, Fibre Channel, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV | | Link aggregation | Yes | Weight & dimensions | Width | 482 mm | | Depth | 724 mm | | Height | 88 mm | Ports & interfaces | Ethernet LAN (RJ-45) ports | 6 | | USB port | Yes | | USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity | 2 | | PCI Express x8 (Gen 3.x) slots | 2 | Processor special features | 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 Trusted Execution Technology | Yes | | Intel TSX-NI | Yes | | Intel TSX-NI version | 1.00 | | Intel Virtualization Technology (VT-x) | Yes | | Intel Virtualization Technology for Directed I/O (VT-d) | Yes | | Intel VT-x with Extended Page Tables (EPT) | Yes | Storage | Storage drives installed | Yes | | Total installed storage capacity | 216 TB | | Number of storage drives installed | 12 | | Number of storage drives supported | 12 | | Installed storage drive type | HDD | | Supported storage drive types | HDD & SSD | | Storage drive capacity | 18000 GB | | Storage drive interface | Serial ATA III | | RAID support | Yes | | Supported storage drive interfaces | Serial ATA II, Serial ATA III | | Storage drive size | 3.5 " | | Storage drive sizes supported | 2.5,3.5 " | | HDD speed | 7200 RPM | | RAID levels | 0, 1, 5, 6, 10, F1, JBOD | | Online RAID migration | Yes | | Online RAID expansion | Yes | | Hot-swap drive bays | Yes | | Supported file systems | BTRFS, Fat, HFS+, NTFS, exFAT, ext3, ext4 | Operational conditions | Operating temperature (T-T) | 0 - 35 °C | | Operating relative humidity (H-H) | 5 - 95 % | | Storage temperature (T-T) | -20 - 60 °C | | Storage relative humidity (H-H) | 5 - 95 % | | Operating altitude | 0 - 5000 m | Packaging content | Cables included | AC | | Power cables quantity | 2 |
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