Synology DiskStation DS1821+ 8-Bay NAS Enclosure

BH #SYDS1821P • MFR #DS1821+
Synology DiskStation DS1821+ 8-Bay NAS Enclosure
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.
In Stock
$999.99
$84/mo. suggested payments for 12 Mos.
with the credit card.§ 
or Save the Tax with the credit card. 
Protect Your Gear
Add a protection plan from $69.99

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

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.
  • UPC: 846504003976

    Synology DS1821+ External HDD/SSD Specs

    Key Specs
    Number of Bays
    8 x 2.5"/3.5"
    2 x M.2 (2280)
    Inputs/Outputs
    4 x RJ45 Gigabit Ethernet
    4 x USB-A 3.0 / 3.1/3.2 Gen 1
    2 x eSATA
    Compatible Drive Interface
    SATA (Unspecified Version)
    RAID
    RAID 0, 1, 10, 5, 6, JBOD, Synology Hybrid
    Computing
    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
    General
    Number of Bays
    8 x 2.5"/3.5"
    2 x M.2 (2280)
    Inputs/Outputs
    4 x RJ45 Gigabit Ethernet
    4 x USB-A 3.0 / 3.1/3.2 Gen 1
    2 x eSATA
    Compatible Drive Interface
    SATA (Unspecified Version)
    Media Card Slots
    No
    Maximum Capacity
    Drives Installed 108 TB
    Form Factor
    Desktop
    RAID
    RAID 0, 1, 10, 5, 6, JBOD, Synology Hybrid
    Hot-Swap Support
    Yes
    PCI Expansion
    1 x PCIe 3.0 (x8 Electrical)
    Wake on LAN
    Yes
    Link Aggregation and Failover Support
    Yes
    Networking
    Supported Protocols
    CalDAV
    FTP
    HTTP
    HTTPS
    NFS
    SMB
    SMB 2.1
    SMB 3.0
    SNMP
    iSCSI LUN
    256
    iSCSI Target
    128
    Max Concurrent Connections
    550
    Max Folders
    512
    Max Sync Tasks
    80
    Max Groups
    256
    Max User Accounts
    2048
    Max Volume Number
    64
    Max Cameras Supported
    40
    Software
    Installed Operating System
    Synology
    Supported File Systems
    Internal: BTRFS, EXT4
    External: BTRFS, EXT3, EXT4, FAT, HFS+, NTFS, exFAT
    OS Compatibility
    Windows 7 or Later
    macOS 10.12 or Later
    *As of January, 2021: Check with manufacturer for the most up-to-date compatibility
    Mobile App Compatible
    Yes
    *As of June, 2023: Check with manufacturer for the most up-to-date compatibility
    Supported Browsers
    Chrome, Edge, Firefox, Internet Explorer, Safari
    Security
    Encryption
    AES-NI
    Security Features
    Password Protection
    VPN Client Connections
    30
    Electrical
    AC Input Power
    100 to 240 VAC, 50 / 60 Hz
    Power Source
    AC Adapter
    Power Consumption
    59.8 W (Typical)
    26.18 W (Idle)
    PSU Wattage
    1 x 250 W
    Environmental
    Operating Temperature
    32 to 72°F / 0 to 40°C
    Operating Humidity
    5 to 95%
    Storage Temperature
    -4 to 140°F / -20 to 60°C
    Physical
    Status Monitoring
    LED Indicator
    Audible Alarm
    Yes
    Cooling
    2 x 120 mm Fans
    Noise Level
    22.2 dBA
    Built-In Speakers
    No
    Dimensions
    13.5 x 9.6 x 6.5" / 343 x 243 x 166 mm
    Weight
    13.2 lb / 6.0 kg
    Packaging Info
    Package Weight
    17 lb
    Box Dimensions (LxWxH)
    18 x 14.6 x 12.3"

    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?
    Asked by: joo
    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
    Answered by: Zev
    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?
    Asked by: Bagavathikan
    Yes. This Synology DiskStation DS1821+ 8-Bay NAS Enclosure, would have Hardware encryption engine (AES-NI). Plex would work great for streaming,
    Answered by: Moe
    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?
    Asked by: vito
    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.
    Answered by: Kennethc
    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...
    Asked by: Vasha
    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.
    Answered by: Karen
    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?
    Asked by: Ashton
    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
    Answered by: Luiz O
    Date published: 2022-11-29

    Is there any drive redundancy for if one hdd ...

    Is there any drive redundancy for if one hdd fails?
    Asked by: Alban
    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.
    Answered by: Raymond B
    Date published: 2022-01-24

    What voltage is supported by the device?

    What voltage is supported by the device?
    Asked by: Anton
    The Synology DiskStation DS1821+ 8-Bay NAS Enclosure supports 100-240v.
    Answered by: Geoffrey
    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?
    Asked by: Pat
    No. At the time of this post, the Synology DiskStation DS1821+ 8-Bay NAS Enclosure, would not support the Seagate 20TB Nas Drives.
    Answered by: Moe
    Date published: 2023-02-24
    • y_2023, m_12, d_1, h_8CST
    • bvseo_bulk, prod_bvqa, vn_bulk_3.0.37
    • cp_1, bvpage1
    • co_hasquestionsanswers, tq_20
    • loc_en_US, sid_1609791, prod, sort_[SortEntry(order=HAS_STAFF_ANSWERS, direction=DESCENDING)]
    • clientName_bhphotovideo