Enterprise server for data-intensive applications
The 12-bay Synology DS3617xsII is a scalable desktop storage system capable of delivering up to 2,359 sequential read and 2,178 MB/s sequential write throughput. Enterprise-class performance, ECC memory, and the Btrfs file system make the DS3617xsII the ideal choice for intensive workloads that demand both large storage capacity and high performance.

Flexible expansion options
The DS3617xsII is easily upgradable and adaptable to any application with Synology PCIe 3.0 add-in cards.

Bandwidth boost
Boost maximum network throughput with Synology 10/25GbE NICs.

SSD cache
Improve read/write performance by up to 16 times with a Synology M.2 adapter coupled with SATA M.2 SSD or by installing one or more 2.5” SAT5200 SSDs.

Smooth expansion
Quickly and easily scale up to 36 drives with two DX1215II expansion units.

Out-of-the-box data protection

Hyper Backup
Back up files, iSCSI LUNs, installed applications, and system configurations to destinations including Synology C2 Storage, public cloud platforms, USB devices, file servers, local folders, or other Synology NAS.

Set and forget backup tasks with regular schedules, enhance security with fine-grained user permissions and encryption, keep backup sizes small with built-in deduplication, and restore data flexibly with multi-versioning.
Snapshot Replication
Snapshot Replication enables flexible point-in-time snapshots of shared folders and virtual machines with an RPO as low as 5 minutes and recovery within seconds.
Active Backup Suite
Securely back up Windows clients and servers, Microsoft 365 and Google Workspace accounts, file servers, and VMware® and Hyper-V® virtual machines with the Active Backup Suite.

Leverage built-in deduplication technology to reduce backup sizes and multi-versioning to allow flexible restoration.

Storage for virtualization
DSM streamlines provisioning for and management of virtual machines with full certification for VMware® vSphere™, Microsoft® Hyper-V®, Citrix® XenServer™, and OpenStack virtualization environments.

Synology Storage Console for VMware® or Windows platforms lets you manage storage directly from your hypervisor. VMware® VAAI integration and Windows ODX help offload storage operations and speed up data transfer.

All-in-one surveillance solution
With Synology Surveillance Station, the DS3617xsII becomes a powerful Network Video Recorder solution. Connect up to 75 IP cameras and take advantage of sophisticated video analytics, including motion detection, no-idle zone, foreign object detection, and anomaly detection, to cover the most advanced 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 web-based DiskStation Manager (DSM) operating system supports a host of native productivity and management solutions.
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.
Synology High Availability
Seamless transition between clustered servers in the event of a server failure to minimize the impact on applications.
Security
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.