Powerful, scalable, and versatileSynology DS1621+ is a powerful and compact 6-bay network attached storage solution designed to store and protect critical data assets. Today’s growing amount of unstructured data requires smarter and increasingly higher performance methods of storing, accessing, and collaborating. Designed for scalability, the DS1621+ enables you to start small, then expand as your data grows.
CPUAMD Ryzen™ 
Cache AccelerationDual M.2 2280 slots for NVMe Cache 
Performance110K, 174% higher 4K random read IOPS 
ScalabilityExpand up to 16 drives with two DX517 expansion units The performance you needReduce transfer times with the DS1621+, designed to accelerate your workloads. Easily add faster networking and NVMe drives to further boost performance. Up to 2,323/1,434 MB/s read/write Up to 25GbE networking 2 x M.2 NVMe cache & storage pool  Storage that fits your needsMake the most of high-performance networking and file access without taking up unnecessary space. DS1621+ comes equipped with 6 bays and can scale up to 16 bays with 2 DX517 expansion units as your data needs grow. 6 bays 100 TB
16 bays 260 TB  Ultimate file management and sharingFile Station is a web-based, fast and secure management tool built to allow easy, drag-and-drop operations without requiring any complex setup on Mac or PC. Advanced search and filtering tools allow for easy organization and file sharing. For complete compatibility, DS1621+ supports the following protocols: AFP, FTP, iSCSI, NFS, SMB, and WebDAV.  DS1621+Synology iSCSI storage fully supports most virtualization solutions to enhance work efficiency with easy management interface. VMware vSphere 6 and VAAI integration helps offload storage operations and optimizes computation efficiency. Windows Offloaded Data Transfer (ODX) speeds up data transfer and migration rate. OpenStack Cinder support turns your Synology NAS into a block-based storage component.     Ultimate Backup SolutionDS1621+ integrates various backup applications into an intuitive user interface, offering durable storage technologies to safeguard your valuable data on any device. 
Active Backup for BusinessCentralize backup tasks for VMware, Windows, and file servers. Restore whatever you want fast and reliably when needed. 
Hyper BackupComprehensively back up your data to a local shared folder, an external device, another Synology NAS, an rsync server, or a public cloud to ensure data safety. 
Synology DriveSafeguard your computer with Synology Drive Client. Effortlessly perform real-time data backups and point-in-time file recovery.  
Active Backup for
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DSM Specifications
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| Maximum Single Volume Size | 108 TB | |
| Maximum Internal Volume Number | 64 | |
| M.2 SSD Storage Pool Support* | ||
| SSD Read/Write Cache (Determining cache size) | ||
| SSD TRIM | ||
| Supported RAID Type |
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| RAID Migration |
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| Volume Expansion with Larger HDDs |
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| Volume Expansion by Adding a HDD |
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| Global Hot Spare Supported RAID Type |
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| Notes |
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| Internal Drives |
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| External Drives |
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| Notes | exFAT Access can be installed for free from Package Center in DSM 7.0. In DSM 6.2 or earlier versions, exFAT Access needs to be purchased in Package Center. | |
| File Protocol |
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| Maximum Concurrent SMB/AFP/FTP Connections | 1,000 | |
| Maximum Concurrent SMB/AFP/FTP Connections (with RAM expansion) | 2,000 | |
| Windows Access Control List (ACL) Integration | ||
| NFS Kerberos Authentication | ||
| Notes |
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| Maximum Local User Accounts | 2,048 | |
| Maximum Local Groups | 256 | |
| Maximum Shared Folder | 512 | |
| Maximum Shared Folder Sync Tasks | 16 | |
| Hybrid Share Folder Number | 10 | |
| Folder and Package Backup | ||
| Entire System Backup | ||
| Notes | Full-system backup requires DSM 7.2 or later. | |
| Synology High Availability | ||
| Syslog Events per Second | 1,000 | |
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Virtualization
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VMware ESXi 6.5 and VAAI | |
| Windows Server 2016 | ||
| Windows Server 2019 | ||
| Windows Server 2022 | ||
| Citrix Ready | ||
| OpenStack | ||
| Supported Protocols | SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV | |
| Supported Browsers |
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| Supported Language | English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文 | |
| Notes | For an updated list of supported browser versions, check the DSM Technical Specifications. | |
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Add-on Packages view the complete package list
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| Suggested Users | 1,500 | |
| Suggested Users | 150 | |
| Notes | Models with expandable memory are tested with their maximum supported memory. | |
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Download Station
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Maximum Concurrent Download Tasks | 80 |
| Maximum iSCSI Target Number | 128 | |
| Maximum LUN | 256 | |
| LUN Clone/Snapshot, Windows ODX | ||
| Notes | iSCSI Manager has been renamed to SAN Manager in DSM 7.0. | |
| Free Email Accounts | 5 (Additional accounts require purchase of licenses) | |
| Suggested Users | 750 | |
| Maximum Server Performance | 1,484,000 emails per day, approx. 45GB | |
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| DLNA Compliance | ||
| Facial Recognition | ||
| Object Recognition | ||
| Maximum Snapshots per Shared Folder | 1,024 | |
| Maximum of System Snapshots | 65,536 | |
| Default Licenses | 2 (Additional cameras require purchase of licenses) | |
| Suggested Maximum IP Cameras and Total FPS (H.264) |
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| Suggested Maximum IP Cameras and Total FPS (H.265) |
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| Notes |
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| Recommended Number of Concurrent Sync Clients | 550 (the number of connections that can be maintained when the recommended number of hosted files was reached) | |
| Recommended Number of Hosted Files | 50,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above) | |
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| Suggested Users | 4,500 | |
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| Recommended Virtual Machine Instances | 8 (Learn more) | |
| Recommended Virtual DSM Number (Licenses required) | 8 (including 1 Free License) | |
| Notes | The specifications vary depending on system configuration and memory size. | |
| Maximum Connections | 40 | |
| NAS | |
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| Compatible Drive Type | 3.5 |
| CPU Architecture | 64-bit |
| CPU Core | 4 |
| CPU Frequency | 2.2 GHz |
| CPU Model | AMD Ryzen V1500B |
| CPU Quantity | 1 |
| Drive Bays | 6 |
| Expansion Port | 2 |
| Hardware Encryption Engine | YES |
| Hot Swappable Drive | YES |
| M.2 Drive Slots | 2 (NVMe) |
| Maximum Memory Capacity | 64 GB (32 GB x 2) |
| Memory | 4 GB DDR4 ECC SODIMM |
| PCIe Expansion | 1 x Gen3 x8 slot (x4 link) |
| Power Supply Unit / Adapter | 250 watts 100V to 240V AC 50/60 Hz, Single Phase |
| RJ-45 1GbE LAN Port | 4 |
| System Fan | 92 mm x 92 mm x 2 pcs |
| Total Memory Slots | 2 |
| USB 3.2 Gen 1 Port | 3 |
