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Synology DiskStation DS3617xsII
A performance powerhouse in desktop form factor

Synology Products
Synology DiskStation
Synology DiskStation DS3617xsII 12 Bay Desktop NAS Storage System
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Synology DiskStation DS3617xsII is a generalpurpose 12-bay NAS system designed to excel in data-heavy environments as a file server, surveillance server, or as virtual machine storage. Powered by Synology DiskStation Manager (DSM), DS3617xsII comes with powerful built-in business solutions and optional expandability for SATA SSD cache, 10/25 GbE networking, and up to 36 drive bays. The unit is backed by Synology's 5-year limited warranty.

  • Solid Performance
    Delivers up to 2,359/2,178 MB/s sequential read/write performance
  • Easy Scalability
    Add 24 additional drive bays for a total of 36 with up to two DX1215(II) expansion units
  • Performance Enhancements
    Add 10/25GbE networking3 or fast SATA SSD cache
  • Synology High Availability
    Maximizes service uptime by combining two devices into a high-availability cluster with minute-level failover
  • Extended Support
    Backed by Synology's 5-year limited warranty

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.1 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.


Intel Xeon quad-core


16 GB DDR4 ECC RAM, up to 48 GB


Optional 10/25GbE connectivity


Up to 36 drive bays with two DX1215II expansion units


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

Protect your data with professional backup software for your Synology NAS, other devices, and applications.

Consolidate backups to your NAS

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.

Implement a 3-2-1 backup strategy
Combine local and remote backup strategies to achieve fully redundant protection of your IT infrastructure using Synology and third-party solutions.

Back up your NAS to other devices

Hyper Backup
Back up files, 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 configurable point-in-time snapshots of shared folders and virtual machines with an RPO as low as 5 minutes and recovery within seconds.

Certified virtual machine storage

Synology DiskStation Manager (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, and a Kubernetes CSI driver lets you provision and manage volumes directly from the K8s CLI.

Fully certified storage virtualization solutions

All-in-one surveillance solution

With Synology Surveillance Station, the DS3617xsII becomes a powerful Network Video Recorder solution. Connect up to 75 IP cameras5 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.

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.


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.

5-year warranty

At Synology, we are committed to product innovation and quality. Synology guarantees a robust and reliable data management experience with a 5-year limited warranty, providing responsive technical support and hardware replacement services to maximize your return on investment.

Synology Replacement Service (SRS)

SRS provides free advance replacement units as early as the next business day in selected regions, maximizing the service uptime for your mission-critical storage and ensuring your business continuity.


Front View
 Rear View
  1. Status indicator
  2. Alert indicator
  3. Power button
  4. LAN indicator
  5. Drive status indicator
  6. Drive tray
  7. Drive tray lock
  8. Power port
  9. System fan
  10. PCIe expansion slot
  11. USB 3.2 Ports
  12. Expansion port
  13. Console port
  14. Reset button
  15. 1GbE RJ-45 port
DS3617xsII Hardware Specifications:
Hardware Specifications
CPU Intel Xeon D-1527 quad-core 2.2GHz, Turbo Boost up to 2.7GHz
Hardware encryption engine Yes (AES-NI)
Memory 16 GB DDR4 ECC SODIMM (expandable up to 48 GB)
Compatible drive type 12 x 3.5" or 2.5" SATA HDD/SSD (drives not included)
Hot swappable drive Yes
External port
  • 2 x USB 3.2 Gen 1 ports
  • 2 x Expansion ports (Infiniband)
Form factor Desktop
Size (Height x Width x Depth) 270 x 300 x 340 mm
Weight 9.8 kg
LAN port 4 x 1GbE RJ-45
Wake on LAN/WAN Yes
PCIe 3.0 slot
  • 1x8 width slot, Gen 3.0 x8 lanes
  • Supports network interface cards and the M2D18 M.2 SSD adapter card for SATA SSD cache
Scheduled power on/of Yes
System fans 2 x (120 x 120 x 25 mm)
AC input power voltage 100 V to 240 V AC
Power Frequency 50/60 Hz, single phase
Operating Temperature 5°C to 40°C (40°F to 104°F)
Storage Temperature -20°C to 60°C (-5°F to 140°F)
Relative Humidity 5% to 95% RH
Maximum operating altitude 5,000 m (16,400 ft)
General DSM specification
Networking protocol SMB, AFP, NFS, FTP, WebDAV, CalDAV, iSCSI, Fibre Channel,3 Telnet, SSH, SNMP, and VPN (PPTP, OpenVPN™, L2TP)
File system
  • Internal: Btrfs, ext4
  • External: Btrfs, ext4, ext3, FAT32, NTFS, HFS+, exFAT
Supported RAID type Synology RAID F1, Basic, JBOD, RAID 0, RAID 1, RAID 5, RAID 6, and RAID 10
Storage management
  • Maximum single volume size: 108TB/200TB
  • Maximum system snapshots: 65,536
  • Maximum internal volume: 1,024
SSD cache
  • Read/write cache support
  • 2.5" SATA SSD support
  • M.2 SATA SSD support
File sharing capability
  • Maximum local user account: 16,000
  • Maximum local group: 512
  • Maximum shared folder: 512
  • • Maximum concurrent SMB/NFS/AFP/FTP connections: 2,000
Privilege Windows Access Control List (ACL), application privileges
Directory service Connects with Windows AD/LDAP servers enabling domain users to login via SMB/NFS/AFP/FTP/File Station using their existing credentials
Virtualization VMware vSphere, Microsoft Hyper-V, Citrix, OpenStack
Security Firewall, shared folder encryption, SMB encryption, FTP over SSL/TLS, SFTP, rsync over SSH, login auto block, Let's Encrypt support, and HTTPS (customizable cipher suite)
Supported clients Windows 7 onwards, macOS 10.12 onwards
Supported browser Google Chrome, Firefox, Microsoft Edge, Safari 13 and later, and Safari (iOS 13.0 and later) on iPad, Chrome (Android 11.0 and later) on tablets
File Server & Synchronization
Cloud Sync Offers one or two-way synchronization with public cloud storage providers including Alibaba Cloud OSS, Backblaze B2, Baidu Cloud, Box, Dropbox, Google Cloud Storage, Google Drive, hubiC, MegaDisk, Microsoft OneDrive, OpenStack Swift-compatible storage, Tencent COS, WebDAV servers and Yandex Disk
Drive Synchronizes files across Windows, macOS, Linux, Android and iOS. The built-in cross-platform portal allows access to data anytime and anywhere
  • Maximum number of hosted files: 3,000,000
  • Maximum number of concurrent connections for PC clients: 900
File Station Provides virtual drives, remote folders, Windows ACL editor, compression/extraction of archived files, bandwidth control for specific users/groups, creation of sharing links, and transfer logs
FTP Server Supports bandwidth control for TCP connections, custom FTP passive port ranges, anonymous FTP, FTP over TLS/SSL and SFTP protocols, network booting with TFTP and PXE support, and transfer logs
Presto File Server Enables high-speed data transfer over WAN through the exclusive SITA technology between Synology NAS and desktop platforms
Universal Search Enables global search of applications and files.
SAN Storage & Virtualization
SAN Manager
  • Maximum number of iSCSI targets: 256
  • Maximum number of LUNs: 512
  • iSCSI LUN clone/snapshot support
Virtual Machine Manager Deploys and runs virtual machines on the Synology NAS, including Windows, Linux, and Virtual DSM.
Data Protection & Backup Solution
Active Backup for Business An all-in-one backup solution designed for heterogeneous business IT environments. It enables IT admins to remotely manage and protect PCs, servers, and VMs from one centralized console
Active Backup for Google Workspace Supports backup and restoration of Google Workspace My Drive, Team Drive, Gmail, Contacts, and Calendar
Active Backup for Microsoft 365 Supports backup and restoration of Microsoft 365 OneDrive for Business, Outlook, Contacts, and Calendar
Backup tools
  • DSM configuration backup, macOS Time Machine support, Synology Drive Client desktop application
  • Shared folder sync supports a maximum of 32 tasks
Hyper Backup Supports local backup, network backup, and data backup to public clouds.
Snapshot Replication
  • Maximum of shared folder snapshots: 1,024
  • Maximum of replication: 64
Synology High Availability Reduces service downtime by combining two identical NAS into a high-availability cluster
Productivity & Collaboration
Collaboration tools Collaborate with instant messaging service Synology Chat, online documents editor Synology Office, and scheduling assistant Synology Calendar
  • Chat maximum user: 4,000
  • Office maximum user: 2,900
  • Calendar: support CalDAV and access via mobile devices
Note Station A note taking platform that supports rich text, note organization and versioning, encryption, sharing, media embedding, and attachments
Synology MailPlus Server A secure, reliable, and private mail solution featuring high-availability, load balancing, security, and filtering options
Synology MailPlus An intuitive webmail interface for Synology MailPlus Server with configurable mail labels, filters, and user interface
Surveillance Station Maximum IP cameras: 75, for a total of 2,250 FPS at 720p (H.264).
All-in-One Servers
Central Management System Provides a single interface to manage and monitor multiple Synology NAS models
Synology Directory Server Provide a flexible and cost-effective domain controller solution
VPN Server
  • Maximum connections: 40
  • Supported VPN protocols: PPTP, OpenVPN, L2TP/IPSec
Mail Server
  • Supported Mail Server protocols: POP3, SMTP, IMAP
  • LDAP/AD account support
Mail Station A webmail interface for Mail Server to receive emails from multiple POP3 mailboxes and SMTP servers.
Web Station Enables hosting for up to 30 websites with support for PHP/MariaDB and 3rd-party applications.
Other packages DNS Server, RADIUS Server, and Log Center
Storage Analyzer Displays volume and quota usage, total size of files, volume usage and trends based on past usage, size of shared folders, large files, most recently modified files, and least recently accessed files.
Antivirus Essential Provides full system scans, scheduled scans, white list customization, and auto-update of virus definitions.
iOS/Android applications Synology Drive, Synology MailPlus, Synology Secure SignIn, Synology Chat, Synology LiveCam, Synology Photos, Synology Active Insight, DS audio, DS photo, DS video, DS cam, DS file, DS finder, and DS note
Other packages Additional 3rd-party packages are available in the Package Center
Certifications and Packaging
Environment safety RoHS compliant
Package content
  • 1 x DS3617xsII main unit
  • 1 x Quick Installation Guide
  • 1 x Accessory pack
  • 1 x AC power cord
  • 2 x RJ-45 LAN cables
Optional accessories
  • DDR4 ECC SODIMM: D4ECSO-2666-16G / D4ECSO-2400-16G / RAMEC2133DDR4SO-16G
  • 10GbE Network Interface Cards: E10G21-F2 / E10G18-T2 / E10G18-T1 / E10G17-F2
  • 25GbE Network Interface Card: E25G21-F2
  • M.2 SSD Adapter Card: M2D18
  • 2.5" SATA SSD: SAT5200
  • 3.5" SATA HDD: HAT5300
  • Expansion Unit: DX1215(II)
  • VisualStation units: VS960HD, VS360HD
  • MailPlus License Pack
  • Surveillance Device License Pack
  • Virtual DSM License Pack
Warranty 5 Years


Download the Synology DiskStation DS3617xsII Datasheet  (PDF).

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Pricing Notes:

Synology Products
Synology DiskStation
Synology DiskStation DS3617xsII 12 Bay Desktop NAS Storage System
Our Price: Request a Quote