- On-premises cloud solution built for performance

HIGH-END SCALABLE NAS IN DESKTOP FORM FACTOR
- DS1621xs+ is a high-end NAS with server-class performance in a 6-bay desktop form factor
- The built-in M.2 SSD cache slots, 10GbE port, expandable memory, and scalable storage design allow you to boost the performance of your NAS, making it ideal for small and medium-sized businesses that need an efficient and space-saving storage solution

ULTIMATE BACKUP SOLUTION
- DS1621xs+ integrates various backup applications into an intuitive user interface, offering durable storage technologies to safeguard your valuable data on any device
* Active Backup for Business: Centralize backup tasks for VMware, Windows, and file servers - Restore whatever you want fast and reliably when needed
* Hyper Backup: Comprehensively 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
* Drive Package: Safeguard your computer with Synology Drive Client - Effortlessly perform real-time data backups and point-in-time file recovery
* Active Backup for Microsoft 365 / Google Workspace: Protect corporate data stored on the cloud - On-premise backup solution with a centralized dashboard - Optimize storage efficiency with single instancing and block-level deduplication technology

REAL-TIME COLLABORATION ON YOUR PRIVATE CLOUD
- Synology Office is a collaboration package combining the convenience and usability of the public cloud with private cloud privacy and security
- It enables seamless collaboration on documents and spreadsheets in a protected environment

VIRTUAL MACHINE MANAGER
- Sandbox new software , manage resources using a single interface, and increase deployment flexibility with Synology Virtual Machine Manager
- Run Windows, Linux, and Virtual DSM instances on your Synology NAS in just a few steps

POWERED BY SYNOLOGY DISKSTATION MANAGER
- Central Management System: Conveniently manage your fleet of Synology NAS from a centralized console
- Synology MailPlus: Secure, reliable, and private mail server solution with an intuitive and modern mail client
- Synology High Availability: Seamless transition between clustered servers in the event of a server failure to minimize the impact on applications
- Security: Shield your Synology NAS from the most sophisticated threats with industry-leading security solutions
- Synology Drive: Instantly access your NAS files across multiple devices whenever you want, wherever you are
- Surveillance: Protect your home or business with intelligent monitoring and video management tools

HARDWARE SPECIFICATIONS
CPU
- CPU Model: Intel Xeon D-1527
- CPU Quantity: 1
- CPU Architecture: 64-bit
- CPU Frequency: 4-core 2.2 (base) / 2.7 (turbo) GHz
- Hardware Encryption Engine (AES-NI): Yes

MEMORY
- System Memory: 8 GB DDR4 ECC SODIMM
- Memory Module Pre-installed: 8 GB (8 GB ×1)
- Total Memory Slots: 2
- Maximum Memory Capacity: 32 GB (16 GB ×2)

STORAGE
- Drive Bays: 6
- Maximum Drive Bays with Expansion Unit: 16 (DX517 ×2)
- M.2 Drive Slots: 2 (NVMe)
- Compatible Drive Type:
* 3.5" SATA HDD
* 2.5" SATA HDD
* 2.5" SATA SSD
* M.2 2280 NVMe SSD
- Maximum Single Volume Size:
* 200 TB (32 GB memory required)
* 108 TB
- Hot Swappable Drive: Yes

EXTERNAL PORTS
- RJ-45 1GbE LAN Port: 2 (with Link Aggregation / Failover support)
- RJ-45 10GbE LAN Port: 1
- USB 3.2 Gen 1 Port: 3
- eSATA Port: 2

PICe
- PCIe Expansion: 1× Gen3 x8 slot (x8 link)

FILE SYSTEM
- Internal Drives: Btrfs, EXT4
- External Drives: Btrfs, EXT4, EXT3, FAT, NTFS, HFS+, exFAT

APPEARANCE
- Size (H×W×D): 166×282×243 mm
- Weight: 5.3 kg

OTHERS
- System Fan: 92×92 mm ×2 pcs
- Fan Speed Mode: Full-Speed Mode, Cool Mode, Quiet Mode
- Easy Replacement System Fan: Yes
- Brightness Adjustable Front LED Indicators: Yes
- Power Recovery: Yes
- Noise Level: 25.2 dB(A)
- Scheduled Power On / Off: Yes
- Wake on LAN / WAN: Yes
- Power Supply Unit / Adapter: 250 W
- AC Input Power Voltage: 100 V to 240 V AC
- Power Frequency: 50/60 Hz, Single Phase
- Power Consumption:
* 62.85 W (Access)
* 34.26 W (HDD Hibernation)
- British Thermal Unit:
* 214.45 BTU/hr (Access)
* 116.89 BTU/hr (HDD Hibernation)

TEMPERATURE
- Operating Temperature: 0C to 40C (32F to 104F)
- Storage Temperature: -20C to 60C (-5F to 140F)
- Relative Humidity: 5% to 95% RH

CERTIFICATIONS
- FCC, CE, BSMI, EAC, CCC, KC, VCCI, RCM

ENVIRONMENT
- RoHS Compliant

PACKAGING CONTENT
1× Main Unit
1× Accessory Pack
1× AC Power Cord
1× RJ-45 LAN Cable
1× Quick Installation Guide

OPTIONAL ACCESSORIES
- DDR4 ECC SODIMM: D4ES01-8G
- DDR4 ECC SODIMM: D4ECSO-2666-16G
- Expansion Units: DX517
- 3.5" SATA HDD: HAT5300
- 2.5" SATA SSD: SAT5200
- M.2 2280 NVMe SSD: SNV3400
- 25GbE Network Interface Card: E25G21-F2
- 10GbE Network Interface Card: E10G21-F2/E10G18-T2/E10G18-T1
- VisualStation: VS360HD
- Surveillance Device License Pack

SOFTWARE SPECIFICATIONS
STORAGE MANAGEMENT
- Maximum Internal Volume Number: 256
- SSD Read / Write Cache (White Paper): Yes
- SSD TRIM: Yes
- RAID Group: Yes
- Supported RAID Type: RAID F1, Basic, JBOD, RAID 0, RAID 1, RAID 5, RAID 6, RAID 10
- RAID Migration: Basic to RAID 1, Basic to RAID 5, RAID 1 to RAID 5, RAID 5 to RAID 6
- Volume Expansion with Larger HDDs: RAID F1, RAID 1, RAID 5, RAID 6, RAID 10
- Volume Expansion by Adding a HDD: RAID F1, JBOD, RAID 5, RAID 6
- Global Hot Spare Supported RAID Type: RAID F1, RAID 1, RAID 5, RAID 6, RAID 10

FILE SERVICES
- File Protocol: SMB/AFP/NFS/FTP/WebDAV
- Maximum Concurrent SMB/AFP/FTP Connections: 2000
- Maximum Concurrent SMB/AFP/FTP Connections (with RAM expansion): 8000
- Windows Access Control List (ACL) Integration: Yes
- NFS Kerberos Authentication: Yes

ACCOUNT & SHARED FOLDER
- Maximum Local User Accounts: 16.000
- Maximum Local Groups: 512
- Maximum Shared Folder: 512
- Maximum Shared Folder Sync Tasks: 32

HYBRID SHARE
- Maximum Hybrid Share Folders: 8

HIGH AVAILBILTY
- Synology High Availability: Yes

LOG CENTER
- Syslog Events per Second: 1500

VIRTUALIZATION
- VMware vSphere with VAAI, Windows Server 2016, Windows Server 2019, Citrix Ready, OpenStack

GENERAL
- Networking Protocols: SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, Fibre Channel, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
- Supported Browsers: Google Chrome, Firefox, Microsoft Edge, Safari

Add-on Packages
- Antivirus by McAfee (Trial): Yes
- Central Management System: Yes
- Document Viewer: Yes
- Video Station: Yes

SYNOLOGY CHET
- Maximum Users: 4000

DOWNLOAD STATION
- Maximum Concurrent Download Tasks: 80

SAN MANAGER
- Maximum iSCSI Target Number: 256
- Maximum LUN: 512
- LUN Clone/Snapshot, Windows ODX: Yes

SYNOLOGY MAILPLUS / MAILPLUS SERVER
- Free Email Accounts: 5 (Licenses required for additional accounts)
- Maximum Number of Concurrent Users: 450
- Maximum Server Performance: 3.363.000 emails per day, approx. 102GB

MEDIA SERVER
- DLNA Compliance: Yes

SYNOLOGY PHOTOS
- Facial Recognition: Yes

SNAPSHOT REPLICATION
- Maximum Snapshots per Shared Folder: 1.024
- Maximum of System Snapshots: 65.536

SURVAILLANCE STATION
- Maximum IP cam (Licenses required): 75 (including 2 Free License)
- Total FPS (H.264):
* 2250 FPS @ 720p (1280×720)
* 1050 FPS @ 1080p (1920×1080)
* 600 FPS @ 3M (2048×1536)
* 400 FPS @ 5M (2591×1944)
* 280 FPS @ 4K (3840×2160)
- Total FPS (H.265):
* 2250 FPS @ 720p (1280×720)
* 2250 FPS @ 1080p (1920×1080)
* 1125 FPS @ 3M (2048×1536)
* 700 FPS @ 5M (2591×1944)
* 490 FPS @ 4K (3840×2160)

SYNOLOGY DRIVE
- 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)
- Recommended Number of Concurrent Sync Clients: 900 (the number of connections that can be maintained when the recommended number of hosted files was reached)

SYNOLOGY OFFICE
- Maximum Users: 2.900

VIRTUAL MACHINE MANAGER
- Recommended Virtual Machine Instances: 8 (Learn more)
- Recommended Virtual DSM Number (Licenses required): 8 (including 1 Free License)

VPN SERVER
- Maximum Connections: 60

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