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Synology DiskStation DS1821+
High capacity storage and data protection for anyone

Synology Products
Synology DiskStation
Synology DiskStation DS1821+ 8 Bay NAS Storage System
#DS1821+
Our Price: $949.99
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Overview:

Synology DiskStation DS1821+ is a powerful 8-bay network-attached-storage solution designed to store and protect missioncritical data. Designed to tackle increasing amounts of unstructured data, the low-noise desktop form-factor of the DS1821+ is built for both SOHO and SMB environments. With performance over 110K or 177% higher 4K random read IOPS than its predecessor, the DS1821+ is fast, with ample room for scalability.

  • Accelerated Performance
    177% higher 4K random read IOPS and 76% faster sequential write speeds compared to its predecessor
  • Maximize Performance
    Turbocharge HDD arrays by 20x or more without occupying drive bays using dual built-in M.2 slots for NVMe SSD cache
  • Easy Expansion
    Scale-up on-demand to 18 drives with two DX517 expansion units
  • Includes Everything to Protect Your Data
    Back up critical data to and from public clouds, Windows PCs and servers, virtual machines, and data on the NAS with Synology Active Backup suite, Hyper Backup, and Snapshot Replication
  • Ready for 10GbE
    Add in a 10GbE SFP+ or RJ-45 NIC to instantly increase network bandwidth based on your existing infrastructure

CPU

AMD Ryzen Quad-core 2.2 GHz

Cache Acceleration

Dual M.2 2280 slots for NVMe Cache

Performance

113K 4K random read IOPS

Scalability

Expand up to 18 drives with two DX517 expansion units

Features:

Faster than ever

The DS1821+ can handle demanding application workloads and a greater number of concurrent users. Experience faster file indexing in Synology Drive, photo organization in Moments, and more responsive web services.


Turbocharge and expand it

Upgrade your DS1621+ to match your data requirements, whether it is for faster networking or for higher storage capacity.

  • 2 x M.2 NVMe
    Enable ultra-fast NVMe cache to accelerate HDD arrays by 20X or more
  • 10GbE support
    Add in faster SFP+ or RJ-45 networking to turbocharge existing workflows
  • Storage Expansion
    Supports two DX517 expansion units for a total of 18 bays

btrf file system


Ultimate file management and sharing

File 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, DS1821+ supports the following protocols: AFP, FTP, iSCSI, NFS, SMB, and WebDAV.


Fully certified storage virtualization solutions

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.

Fully certified storage virtualization solutions

Ultimate Backup Solution

DS1821+ 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

Active Backup for Business

Centralize backup tasks for VMware, Windows, and file servers. Restore whatever you want fast and reliably when needed.

Hyper Backup

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

Drive Package

Safeguard your computer with Synology Drive Client. Effortlessly perform real-time data backups and point-in-time file recovery.

Active Backup for Office 365 / G Suite

Active Backup for Office 365 / G Suite

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.



Engineered for reliability, backed by Synology

DS1821+ is designed to reliably store your data and is backed by Synology's three-year hardware warranty. An optional two-year extended warranty is available in select regions for up to five years of coverage.

Engineered for reliability, backed by Synology

Powered by Synology DiskStation Manager

Central Management System

Central Management System

Conveniently manage your fleet of Synology NAS from a centralized console.

Synology MailPlus

Synology MailPlus

Secure, reliable, and private mail server solution with an intuitive and modern mail client.

High Availability

Synology High Availability

Seamless transition between clustered servers in the event of a server failure to minimize the impact on applications.

Snapshot Replication

Synology Drive

Instantly access your NAS files across multiple devices whenever you want, wherever you are.

Surveillance Station

Surveillance Station

Complete surveillance solution for recording, monitoring, and management.

Security

Security

Comprehensive built-in security tools are constantly updated to protect your devices against evolving



Works best with Synology drives

Engineered to handle intensive 24/7 workloads, Synology drives consistently deliver top-grade performance.

  • SATA: 3.5” HDD HAT5300
  • NVMe: M.2 SSD SNV3000
  • SATA: 2.5” SSD SAT5200

Specifications:

  1. Status indicator
  2. Alert indicator
  3. Power button and indicator
  4. LAN indicator
  5. Drive status indicator
  6. Drive tray
  7. Drive tray lock
  8. USB 3.2 Gen 1 port
  9. Power port
  10. System fan
  11. PCIe expansion slot
  12. Kensington Security Slot
  13. Expansion port
  14. 1GbE RJ-45 port
  15. Reset button
  16. USB 3.2 Gen 1 port
DiskStation DS1821+ Hardware Specifications:
Hardware Specifications
CPU AMD Ryzen V1500B quad-core 2.2 GHz
Hardware encryption engine Yes (AES-NI)
Memory 4 GB DDR4 ECC SODIMM (expandable up to 32 GB)
Compatible drive type
  • 8 x 3.5" or 2.5" SATA HDD/SSD (drives not included)
  • 2 x M.2 2280 NVMe SSD (drives not included)
Hot swappable drive Yes
External port
  • 4 x USB 3.2 Gen 1
  • 2 x eSATA
Size (Height x Width x Depth) 166 x 343 x 243 mm
Weight 6.0 kg
LAN port 4 x 1GbE RJ-45
Wake on LAN/WAN Yes
PCIe 3.0 slot
  • 1 x 4-lane x8 slot
  • Supports 10GbE network interface cards
Scheduled power on/of Yes
System fan 2 (120 x 120 x 25 mm)
AC input power voltage 100 V to 240 V AC
Power Frequency 50 to 60Hz, single phase
Operating Temperature 0°C to 40°C (32°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, Telnet, SSH, SNMP, VPN (PPTP, OpenVPN, L2TP)
File system
  • Internal: Btrfs, ext4
  • External: Btrfs, ext4, ext3, FAT32, NTFS, HFS+, exFAT
Supported RAID type Synology Hybrid RAID (SHR), Basic, JBOD, RAID 0, RAID 1, RAID 5, RAID 6, RAID 10
Storage management
  • Maximum single volume size: 108 TB
  • Maximum system snapshots: 65,536
  • Maximum internal volume: 64
SSD cache
  • Read/write cache support
  • M.2 NVMe SSD support
File sharing capability
  • Maximum local user account: 2,048
  • Maximum local group: 256
  • Maximum shared folder: 512
  • Maximum concurrent SMB/NFS/AFP/FTP connection: 1,000
Privilege Windows Access Control List (ACL), application privileges
Directory service Windows AD integration: Domain users login via SMB/NFS/AFP/FTP/File Station, LDAP integration
Virtualization VMware vSphere 6.5, 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, HTTPS (customizable cipher suite)
Supported client Windows 7 onwards, macOS 10.12 onwards
Supported browser Chrome, Firefox, Internet Explorer 11 onwards, Safari 11 onwards; Safari (iOS 11 onwards), Chrome (Android™ 6.0 onwards)
File Server & Synchronization
Drive Provide a universal portal to synchronize your files across various platforms, including Windows, macOS, Linux, Android™ and iOS. The built-in universal portal allows you to access data anytime and anywhere.
  • Maximum number of hosted files: 1,000,000
  • Maximum number of concurrent connections for PC clients: 550
File Station Virtual drives, remote folders, Windows ACL editor, compressing/extracting archived files, bandwidth control for specific users/groups, creating sharing links, transfer logs
FTP Server Bandwidth control for TCP connections, custom FTP passive port range, anonymous FTP, FTP SSL/TLS and SFTP protocol, boot over the network with TFTP and PXE support, transfer logs
Presto File Server High-speed data transfer over WAN with exclusive SITA technology between Synology NAS and desktop
Cloud Sync One or two-way synchronization with public cloud storage providers including Alibaba Cloud OSS, Amazon S3-compatible storage, Backblaze B2, Baidu Cloud, Box, Dropbox, Google Cloud Storage, Google Drive, hubiC, MegaDisk, Microsoft OneDrive, OpenStack Swift-compatible storage, Tencent COS, WebDAV servers, Yandex Disk
Universal Search Offer global search into applications and files
File Server & Synchronization
iSCSI Manager
  • Maximum iSCSI target: 128
  • Maximum iSCSI LUN: 256
  • iSCSI LUN clone/snapshot support
Virtual Machine Manager Deploy and run various virtual machines on Synology NAS, including Windows®, Linux®, or Virtual DSM
Data Protection & Backup Solution
Hyper Backup Support local backup, network backup, and data backup to public clouds
Backup tools
  • DSM configuration backup, macOS® Time Machine® support, Synology Drive Client desktop application
  • Shared folder sync - maximum task number: 16
Snapshot Replication
  • Maximum of shared folder snapshots: 1,024
  • Maximum of replication: 32
Synology High Availability Reduce service downtime by setting up two identical NAS into one high-availability cluster
Active Backup for G Suite Support G Suite My Drive and Team Drive backup and restoration
Active Backup for Microsoft 365 Supports Microsoft 365 OneDrive for Business, mail, contacts, and calendar backup and restoration
Active Backup for Business All-in-one backup solution designed for heterogeneous business IT environment, enabling IT admins to remotely manage and monitor protection over PC, servers and VM on one centralized console
Productivity & Collaboration
Collaboration tools Collaborate with instant message service Synology Chat, online editor Synology Office, and scheduling assistant Synology Calendar
  • • Chat maximum user: 1,500
  • Office maximum user: 1,800
  • Calendar: support CalDAV and access via mobile devices
Note Station Rich-text note organization and versioning, encryption, sharing, media embedding and attachments
Synology MailPlus Server Secure, reliable, and private mail solution with high-availability, load balancing, security and filtering design (includes 5 free email account licenses; additional accounts require the purchasing of additional licenses)
Synology MailPlus Intuitive webmail interface for Synology MailPlus Server, customizable mail labels, filters, and user interface
Multimedia
Moments Support smart AI album with facial and subject recognition, photo editing and sharing features, similar photo detection, autoediting functions such as color correction and angle adjustments, and AI selection of the best photos. Mobile applications are available on iOS and Android™ devices
Other packages Video Station, Photo Station, Audio Station, iTunes Server
Surveillance
Surveillance Station Maximum IP camera: 40 (total of 1,200 FPS at 720p, H.264) (Including two free camera licenses. Additional cameras require the purchasing of additional licenses)
All-in-One Server
Synology Directory Server Provide a flexible and cost-effective domain controller solution
Central Management System Provide a single interface to manage and monitor multiple Synology NAS
VPN Server Maximum connection: 30. Supported VPN protocol: PPTP, OpenVPN™, L2TP/IPSec
Mail Server Supported Mail Server protocol: POP3, SMTP, IMAP. LDAP/AD account support
Mail Station Webmail interface for Mail Server to receive emails from multiple POP3 mailboxes, customizable SMTP server
Web Station Virtual host (up to 30 websites), PHP/MariaDB, 3rd-party applications support
Other packages DNS Server, RADIUS Server, Log Center
Others
Storage Analyzer 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, least recently accessed files
Antivirus Essential Full system scan, scheduled scan, white list customization, virus definition auto update
iOS/Android™ applications Synology Drive, Synology MailPlus, Synology Chat, Synology LiveCam, Moments, DS audio, DS photo, DS video, DS cam, DS file, DS finder, DS note
Other packages Additional 3rd-party packages available on Package Center
Certifications and Packaging
Environment safety RoHS compliant
Package content
  • 1 x DS1821+ main unit
  • 1 x Quick Installation Guide
  • 1 x Accessory pack
  • 2 x Hard drive tray key
  • 1 x AC power cord
  • 2 x RJ-45 LAN cable
Optional accessories
  • DDR4 ECC SO-DIMM: D4ES01-4G/D4ES01-8G/D4ECSO-2666-16G
  • 10GbE Network Interface Card: E10G18-T2/E10G18-T1/E10G17-F2
  • 2.5" SATA SSD: SAT5200
  • M.2 2280 NVMe SSD: SNV3400
  • Expansion Unit: DX517
  • VisualStation: VS960HD/VS360HD
  • Surveillance Device License Pack
  • MailPlus License Pack
  • Virtual DSM License Pack
Warranty 3 Years

Documentation:

Download the Synology DiskStation DS1821+ Datasheet  (PDF).

Pricing Notes:

Synology Products
Synology DiskStation
Synology DiskStation DS1821+ 8 BayNAS Storage System
#DS1821+
Our Price: $949.99
Synology Recommended Bundles
32TB Bundle
Synology DiskStation DS1821+ (8 bay) with Ironwolf HDD 512/4KN SATA Hard Drive (QTY 8x4TB) 32TB Capacity
#DS-Ironwolf-33
Our Price: $1,993.00
48TB Bundle
Synology DiskStation DS1821+ (8 bay) with Ironwolf HDD 512/4KN SATA Hard Drive (QTY 8x6TB) 48TB Capacity
#DS-Ironwolf-34
Our Price: $2,389.00
64TB Bundle
Synology DiskStation DS1821+ (8 bay) with Ironwolf HDD 512/4KN SATA Hard Drive (QTY 8x8TB) 64TB Capacity
#DS-Ironwolf-35
Our Price: $2,913.00
80TB Bundle
Synology DiskStation DS1821+ (8 bay) with Ironwolf HDD 512/4KN SATA Hard Drive (QTY 8x10TB) 80TB Capacity
#DS-Ironwolf-36
Our Price: $3,382.00
96TB Bundle
Synology DiskStation DS1821+ (8 bay) with Ironwolf HDD 512/4KN SATA Hard Drive (QTY 8x12TB) 96TB Capacity
#DS-Ironwolf-37
Our Price: $3,713.00
112TB Bundle
Synology DiskStation DS1821+ (8 bay) with Ironwolf HDD 512/4KN SATA Hard Drive (QTY 8x14TB) 112TB Capacity
#DS-Ironwolf-38
Our Price: $4,376.00
128TB Bundle
Synology DiskStation DS1821+ (8 bay) with Ironwolf HDD 512/4KN SATA Hard Drive (QTY 8x16TB) 128TB Capacity
#DS-Ironwolf-39
Our Price: $4,707.00