Key Features
8 x 3.5″ / 2.5″ SATA Drive Bays
2 x M.2 2280 NVMe SSD Slots
2.2 GHz AMD Ryzen V1500B Quad-Core CPU
4GB DDR4 ECC RAM
4 x Gigabit Ethernet Ports
4 x USB 3.1 Gen 1 Ports
2 x eSATA Port
RAID 0, 1, 5, 6, 10, Hybrid, JBOD
PCIe 3.0 x8 Expansion Slot
Synology DSM Operating System

Synology DS1821+ Overview
Expand the network storage capacity for your small- to medium-business or SOHO (Small Office, Home Office) environment with the DiskStation DS1821+ 8-Bay NAS Enclosure from Synology. Useful for high-speed file sharing, backups, and surveillance, this enclosure supports up to eight 3.5″ and 2.5″ SATA drives in RAID 0, 1, 5, 6, 10, Synology Hybrid, and JBOD modes for up to 110,000 4K random read IOPS and 2300 MB/s sequential write speeds to handle demanding workloads. Installing up to two M.2 NVMe PCIe solid-state cache drives into the available slots can boost hard drive array performance by over 20x. In addition to having four Gigabit Ethernet ports with Link Aggregation and Failover support, the PCIe 3.0 x8 slot allows you to install expansion cards such as 10GbE network adapters to further enhance performance. The DiskStation DS1821+ works with Windows 7 and macOS 10.12 or later systems, and its integrated Synology DSM operating system supports a host of applications for file management, security, and more.

High-Performance NAS
The Synology DiskStation DS1821+ NAS enclosure is powered by a 2.2 GHz AMD Ryzen quad-core processor with 4GB of ECC DDR4 memory. It supports up to eight 3.5″ and 2.5″ SATA drives in RAID 0, 1, 5, 6, 10, Synology Hybrid, and JBOD modes with a maximum single volume size of 108TB.

Cache Acceleration
Installing up to two M.2 NVMe PCIe solid-state cache drives can accelerate hard drive array performance by over 20x.

Connectivity
The Synology DiskStation DS1821+ includes four Gigabit Ethernet ports with Link Aggregation and Failover support. Four USB 3.1 Gen 1 ports and two eSATA ports are available for connecting external storage drives and other devices to share across the network.

Scalability
A PCIe 3.0 slot is available for expansions such as 10GbE network adapters for high-speed data transfers and backups. Connecting up to two Synology DX517 5-bay expansion units to the DiskStation DS1821+ provides you with a total of 18 drive bays. Up to 32GB of memory can be installed across two SO-DIMM slots to further boost NAS performance and efficiency.

File Management and Sharing
The web-based File Station tool is built with intuitive, drag-and-drop operations for fast and secure file management from Windows and Mac computers. Advanced search and filtering tools allow for easy organization and file sharing, and the DS1821+ supports AFP, FTP, iSCSI, NFS, SMB, and WebDAV protocols.

Certified Storage Virtualization
Synology iSCSI storage supports most virtualization solutions to enhance work efficiency. Support includes VMware vSphere 6 and VAAI integration to help offload storage operations and optimize computation efficiency. Additionally, Windows Offloaded Data Transfer (ODX) speeds up data transfer and migration rate and OpenStack Cinder support turns your Synology NAS into a block-based storage component.

Versatile Backup Solutions
The Synology DiskStation DS1821+ integrates a variety of backup applications to fit your needs, including Active Backup for Business, Hyper Backup, Synology Drive, and Active Backup for Microsoft 365 / G Suite.

Synology DSM Applications
The Synology Central Management System allows you to simultaneously manage multiple Synology NAS servers from a centralized interface.
Synology MailPlus provides a secure, reliable, and private mail server solution.
Quickly transition between clustered servers in the event of a server failure to minimize the impact on applications.
Comprehensive security tools are built-in and are continually updated to protect your devices against threats.
The Synology Drive application offers versatile tools for file management and synchronization.
With the Surveillance Station application, you have a complete solution for recording, monitoring, and management.

Synology DS1821+ Specs
General
Number of Bays : 8 x 2.5″/3.5″
2 x M.2 (2280)
Media Card Slots : None
Maximum Filled Capacity : 108 TB
Connections : 4 x RJ45 (Gigabit Ethernet)
4 x USB Type-A (USB 3.1 / USB 3.2 Gen 1 (5 Gb/s))
2 x eSATA
Compatible Drive Interface : SATA (Unspecified Version)
Form Factor : Desktop
RAID Modes : RAID 0, 1, 10, 5, 6, JBOD, Synology Hybrid
Hot-Swap Support : Yes
Expansion Slots : 1 x PCIe 3.0 x8 (x4 mode)
Link Aggregation and Failover Support : Yes
Wake on LAN : Yes
Drives
Type : None
Computing
Processor : AMD Ryzen V1500B Quad-Core
Clock Speed : Base: 2.2 GHz
Total Installed Memory : 4 GB ECC DDR4
User-Replaceable Memory : 1 x 4 GB
Total Memory Slots : 2 x SO-DIMM
Maximum Memory Capacity : 32 GB
Networking
Supported Protocols :
CalDAV
FTP
HTTP
HTTPS
NFS
SMB
SMB 2.1
SMB 3.0
SNMP
iSCSI LUN : 256
iSCSI Target : 128
Max Cameras Supported : 40
Max Concurrent Connections : 550
Max Folders : 512
Max Groups : 256
Max Sync Tasks : 80
Max User Accounts : 2048
Max Volume Number : 64
Software
Installed Operating System : Synology
OS Compatibility : Windows 7 or Later
macOS 10.12 or Later
File System Formats Supported : Internal: Btrfs, EXT4
External : Btrfs, EXT3, EXT4, FAT, HFS+, NTFS, exFAT
Supported Browsers : Chrome, Edge, Firefox, Internet Explorer, Safari
Electrical
Power Consumption : 59.8 W (Typical)
26.18 W (Idle)
Power Source : AC Adapter
PSU Wattage : 1 x 250 W
AC Input Power : 100 to 240 VAC, 50 / 60 Hz
AC Input Power : VAC50 / 60 Hz
Security
Encryption : AES-NI
Security Features : Password Protection
VPN Client Connections : 30
Environmental
Operating Temperature : 32 to 104Â°F / 0 to 40Â°C
Operating Humidity : 5 to 95%
Storage Temperature : -4 to 140Â°F / -20 to 60Â°C
Physical
Cooling : 2 x 120 mm Fans
Noise Level : 22.2 dBA
Built-In Speakers : None
Audible Alarm : Yes
IR Sensor : None
Status Monitoring : LED Indicator
Dimensions : 13.5 x 6.5 x 9.6″ / 343 x 166 x 243 mm
Weight : 13.2 lb / 6 kg