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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.
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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
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.
Synology DS1821+ External HDD/SSD Overview
- 1Description
- 2High-Performance NAS
- 3Cache Acceleration
- 4Connectivity
- 5Scalability
- 6File Management and Sharing
- 7Certified Storage Virtualization
- 8Versatile Backup Solutions
- 9Synology DSM Applications
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
UPC: 846504003976
Synology DS1821+ External HDD/SSD Specs
Key Specs
| Number of Bays | |
| Inputs/Outputs | |
| Compatible Drive Interface | |
| RAID |
Computing
| Total Installed Memory | |
| User-Replaceable Memory | |
| Total Memory Slots | |
| Maximum Memory Capacity |
General
| Number of Bays | |
| Inputs/Outputs | |
| Compatible Drive Interface | |
| Media Card Slots | |
| Maximum Capacity | |
| Form Factor | |
| RAID | |
| Hot-Swap Support | |
| PCI Expansion | |
| Wake on LAN | |
| Link Aggregation and Failover Support |
Networking
| Supported Protocols | |
| iSCSI LUN | |
| iSCSI Target | |
| Max Concurrent Connections | |
| Max Folders | |
| Max Sync Tasks | |
| Max Groups | |
| Max User Accounts | |
| Max Volume Number | |
| Max Cameras Supported |
Software
| Installed Operating System | |
| Supported File Systems | |
| OS Compatibility | |
| Mobile App Compatible | |
| Supported Browsers |
Security
| Encryption | |
| Security Features | |
| VPN Client Connections |
Electrical
| AC Input Power | |
| Power Source | |
| Power Consumption | |
| PSU Wattage |
Environmental
| Operating Temperature | |
| Operating Humidity | |
| Storage Temperature |
Physical
| Status Monitoring | |
| Audible Alarm | |
| Cooling | |
| Noise Level | |
| Built-In Speakers | |
| Dimensions | |
| Weight |
Packaging Info
| Package Weight | |
| Box Dimensions (LxWxH) |
Synology DS1821+ External HDD/SSD Reviews
See any errors on this page? Let us know
Hi there, about the Ram Memory, i could use a OWC ...
Hi there, about the Ram Memory, i could use a OWC 16gb ddr4 2666 or just the synology memory?
For best results with the Synology DiskStation DS1821+ 8-Bay NAS Enclosure you should use the Synology RAM: D4ES01-4G/D4ES01-8G/D4ECSO-2666-16G
Date published: 2022-02-23
Does this have Hardware Encryption engine? Also ...
Does this have Hardware Encryption engine? Also will the Plex will work comfortably when streaming?
Yes. This Synology DiskStation DS1821+ 8-Bay NAS Enclosure, would have Hardware encryption engine (AES-NI). Plex would work great for streaming,
Date published: 2021-11-10
Since it is now November of 2023, this is a ...
Since it is now November of 2023, this is a followup question to the compatibility of the Seagate 20TB Ironwulf drives. Support?
Synology does not list any 20TB drives on the compatibility list for the Synology DiskStation DS1821+ 8-Bay NAS Enclosure. The 16TB IronWolf Pro, B&H # SEST16000NT1, is the highest capacity IronWolf drive on Synology's compatibility list.
Date published: 2023-11-29
Can this be expanded by adding drives with an ...
Can this be expanded by adding drives with an active volume set up? Such as adding a 6th drive if you have 5 slots filled and already set up a running volume...
With 8 bays you just need to tell storage manager to expand the volume to include the new drives you install up to your 8 bays. You can even replace the existing drives with larger drives and maintain the same volume. Im doing that now. Going from 6Tb drives to 10TB drives in the same volume. Note: I cannot add extra drives because Im already using all 8 bays.
Date published: 2021-08-23
when i buy this do i just add my hdd's to have it ...
when i buy this do i just add my hdd's to have it working on my network as a nas or do i have to buy extra stuff?
The Synology DiskStation DS1821+ 8-Bay NAS Enclosure comes with ethernet cables for you to set it up and you just need the proper hard drive to start (It is recommended to have NAS rated drives). You can also upgrade it with 2 x M.2 (2280) and it also has a 1 x PCIe 3.0 (x8) expansion slot, but its not mandatory
Date published: 2022-11-29
Is there any drive redundancy for if one hdd ...
Is there any drive redundancy for if one hdd fails?
The DiskStation NAS Enclosures supports RAID configurations 1, and 5, for one drive failure, and 6 that continue running with up to two drive failures.
Date published: 2022-01-24
What voltage is supported by the device?
What voltage is supported by the device?
The Synology DiskStation DS1821+ 8-Bay NAS Enclosure supports 100-240v.
Date published: 2022-05-19
Does the Synology DS1821+ 8 bay unit support ...
Does the Synology DS1821+ 8 bay unit support Seagate 20TB Nas Drives?
No. At the time of this post, the Synology DiskStation DS1821+ 8-Bay NAS Enclosure, would not support the Seagate 20TB Nas Drives.
Date published: 2023-02-24