Synology Diskstation DS1821+ 8-Bay NAS Enclosure, 4-Core 2.2GHz, 4GB RAM, No HDD

SKU: SYDS1821P

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Questions & Answers

Shopper : Why Did You Choose This?ARTHUR Z : Needed to replace a Drobo NAS.CRAIG R : Upgraded version of my one that died.RAYMOND Y : Because I’ve owned synology Nas before and their software and hardware are very user friendly for non IT people like me.Dennis R : Backup solutionMICHAEL D : Needed to replace blade server that died. Wanted smaller footprint.ROD V : Need additional storageROD V : Needed upgrade on storageANDREW J : Extensive online research, plus my own personal preferences as a Computer Guy.JACK J : Referred by a friendGABRIEL M : Highly recommended by peers. Need to replace existing Drobo NAS System - Need additional backup storageMICHAEL C : Upgrade to my current Synology 8-bay NASJAMES F : Video editing / data backup for a small home business.RAYMOND L : Son has a DS1821+ and it is fast on his network with memory and m2 upgrade.MARC S : Reputation and expandabilitySTEVEN H : Owned 1812+ and loved it. Wanted to upgrade to faster unitJAMES E H : Needed to upgrade from my previous NAS device. Synology appears to have the right mix of tech and user friendlinessCRAIG M : I'm upgrading from Drobo, which went bankrupt and is no longer supported.WANYI Z : I needed as many bays as possibleHOANG N : Synology’s OS is more refined than competitors. At least, that’s what I’ve read.HOANG N : I read that synology’s OS is more refined than competitors.MR PUNEET KUMAR B : Price was rightCHRISTOPHER K : Price and brand.MARTIN T : Great product and price!Yingde Z : Powerful machineMARK F : Because I wanted itKAMAL S : Reviews on the DiskStation. I bought from Adorama because the price was right. I almost bought from the "B H" guys, but their computers didn't want to take my online-order since they were closed for sabbath. I didn't know web servers belonged to a religion, and observed the sabbath.JUSTIN K : RecommendedEDWARD J : Good value. Better specs over the DS920+ and 8 bays.THOMAS P : Best Nas outCEDRIC J : Because it is compatible with the one that I have nowMICHAEL R : Current owner of Synology RS3614x with two expansion unitsSHAWN F : ReputationRICK V : Good balance between upgradeability and out of the box performance. NVME and RAM upgrades matter a TON when indexing media or dealing with concurrent users. Also runs on ECC RAM.OMAR M : Wanted a big NAS Enclosure, perfect for my use caseGISLAINE A : The best NAS storage hardware availableRANDALL S : Because I needed a storage solution.JON L : I have used the DS1815+ for high-speed storage for video editing for the past 8 years. I purchased the DS1821+ to appropriately migrate my existing files to a new unit to stay current with technology.WOODROW C : to replace older Drobo Drives.YUNG T : This product suits my needs. Synology make good NAS.SWAROOP A : I am a repeat customer upgrading after 7 yearsHEATHER M : Been meaning to purchase this.JAMES W : Awesome Ryzen cpu, 8 bays for drives, 2 m.2 slots, and a pcie expansion? Awesome NAS!MICHAEL F : I have used these on a daily basis over the past 2 years to manage our company's media output, and have been impressed with the performance and reliability that these devices have to offer... A+ Synology!ANTON K : I had the predecessor for about 10 years. Software works is stable.BAILEY, S : I purchased my First Synology Device last year and am happy with and have not had any issues with it. I would highly recommend one.GRAHAM H : Needed to create a better backup and storage system than multiple standard HDDs.MATTHEW M : Storage for photography filesBRUCE C : ResearchJUSTIN C : Upgrading from DS1815+ to new unit.SEAN H : What they requested, not the right person for that questionJerry M : ReputationJOSHUA B : Need an upgrade from my smaller NAS that died recently.JOHN J : External review of product

Reviews about this item

Review Summary

2025-02-24T08:45:15

Rated 5 out of 5

Excellent NAS

Excellent NAS. I only wish it had a faster processor with more PCIe lanes.

Paul A.

2024-06-11T20:34:05

Rated 5 out of 5

Great storage solution!

The best investment for all my storage needs!!

MIGUEL M.

2024-04-05T10:30:56

Rated 5 out of 5

should have switched years ago

no more cloud use, private storage peace of mind. I should have switched years ago

JIE L.

2024-03-25T09:25:52

Rated 4 out of 5

Great NAS

This is my third Synology NAS. Great multi-use unit with 3 arrays. Pulled drives from an older array, and this one picked them up right away. Added Samsung SSDs for general storage and Toshiba HDDs for surveillance. The SSDs are not on the supported list, but work with no issues, and report SMART data. My older HDD array had no issues. I transferred the data from it to the new SSD array, and reformatted the old array for BTRFS. The older array is being used to back up the new SSD array, and for immutable storage. Eventually, a new NAS will take on that role, and these drives will be retired so the SSD array can grow. I'm down to 1 NAS at the moment, which is not ideal. I prefer to have a backup NAS to my primary in addition to cloud storage. As I talk about my workflow below keep in mind the future state will include my arrays on separate NAS units in separate buildings. My current work flow is to export my RAW files to the SSD array and cull them in Lightroom. I delete bad and redundant files. While doing this, I also mark the files I plan to edit. These files are then exported to an immutable storage folder. This is my final line of defense. I have my full RAWs on the SSD. This is where I make my edits and save edited versions the customer. My RAWs and edited customer files are backed up to my HDD array, and also to the cloud. Only at this point do I format my camera media. The idea is I should only ever need what is on the SSD array. If that fails, the HDD array has full backups of everything. If that fails could has backups of that. The immutable storage is to keep ransomware from ever being an issue. It will eventually get it's own place to live as well once I have another NAS. I also use the NAS to backup my PCs and my wife's PCs. I am setting her up to use the NAS for her graphic design gigs as well rather than just using the NAS as backup. Surveillance works well, and I have this paired with several Synology cameras. I love these cameras. The AI with alerting set up is really good. It's like having a person watching the cameras at all times and letting me know when someone is on the property. I did take one star off of the NAS. That has to do with Container Manager (Docker). I had an image that froze up and was sending constant alerts that it was restarting. There was no way to kill that container, or remove it without removing Container Manager itself, which meant shutting down all my containers. That was a huge hassle. It is resolved now, but it was more work than it should have been. Other than that, the NAS has been great. I'm making good use of the 4 Ethernet ports on the back. I have 2 bonded for my PCs to access. 1 is unused, and the 4th is dedicated to my camera VLAN. I keep my cameras on their own VLAN with NO Internet access. Less of an issue now that I have switched to NDAA/TAA cameras, but it is still a good policy. My IoT devices are on a different VLAN too, and cannot see my NAS. Don't trust them. Don't want them to see anything they are not supposed to, but I digress. This NAS has a lot of great features I plan to use as my business expands. LDAP, VM server, web server for my wife to test sites on, and others. It is a great box that I expect to serve me well into the future.

GEORGE G.

2023-06-27T03:56:14

Rated 5 out of 5

Amazing experience

Great transaction Great product

GUSTAVO Z.

2023-04-17T04:30:21

Rated 5 out of 5

Dead simple to set up

This is my fourth Synology RAID. They are dead simple to set up. I crossed my eight drives from a very old Synology. I had played with the first one so much it was pretty flaky, so I started this one off clean and copied all my data over. I upgraded it by adding a 2.5G ethernet card connected to a 2.5G backbone in my home network. A great combination!

JEFFREY M.

2022-07-10T10:30:06

Rated 5 out of 5

The best upgradeable pro-Sumer SMB NAS.

If you are, like me, used to the DSM Operating system interface that Synology has developed then you are likely not just shopping across brands for the most powerful NAS. Because Synology is a big wimpy at times. BUT their software is great and their hardware nothing to sneer at albeit not leading edge. The DS1821+ Has strong expansion options. I added 2 x sn700 nvme cache modules. And 2x 32gb ecc memory and it recognizes it all and runs excellent. What took days on my DS1517 now takes mere minutes. My DSM is always available whereas I used to get tons of time outs. I also added 1 DS517 expansion module and a 10GbE. Mellanox ConnectX3 low profile card. Zero issues. Note that Synology lists compatible hardware but it doesn?t means that if things aren?t on the list it?s not compatible. They simply didn?t test it. Overall this machine w 320$ in extra upgrades (2x nvme and 2 x 32 gb ram) is top end speed. I recommend 2x16gb and save yourself some money. I used basic ecc and it works despite they claiming non-ecc is needed (non-ecc is junky). Great buy for years to come. High speed and expandable power specs.

RICK W.

2022-04-08T10:07:12

Rated 5 out of 5

Love it

The Synology is great!!! I love it and Adorama did a great job consulting me!

JULIAN G.

2022-02-22T07:41:44

Rated 4 out of 5

Satisfied

Great for home storage / server usage

PETER C.

2022-01-28T07:56:53

Rated 5 out of 5

Perfect NAS/SAN

Love it. Moved from WD1821+ with no regret.

Sam S.

2022-01-24T09:08:07

Rated 5 out of 5

Best NAS I have used.

I couldn?t be happier about this NAS. Synology makes it so easy to set up and manage their product. In addition, I can run docker and Plex on the NAS just fine. I did opt to get a RAM upgrade because I plan on using docker for a testing environment. This product has been flawless since picking it up last month. I should have upgraded sooner. I have setup several NAS for other photographers and after setting up their Synology NAS units, I just had to get my own. I prefer Synology to their competitors.

Stephen M.

2021-10-29T09:35:35

Rated 5 out of 5

Thumbs Up

Works as expected and would recommend.

JESSIE S.

2021-04-21T14:42:19

Rated 5 out of 5

WOW! So far I?m VERY impressed.

Synology DS1821+ I?ve got it in a temporary location right now. I have to make space in my server area, but I don?t want to disrupt that until I?ve got the new box set up. From a performance point of view: Everything from logging in to execution of various programs has thus far been noticeably faster than my DS916+, DS1513+, or my old DS412+. I?m so impressed with the AMD Ryzen processor in this machine. The machine is still brand new (not even a week old) so I haven?t put it through all the paces yet. I?ve had to wait for storage devices, the consistency check & building my array on it to complete before I can do anything. I went with array 1: 5 x 6TB drives, Hot Swap: 1 12TB, and Array 2 is 2 x 8TB drives. I also added 16GB of memory, so I have a total 20GB memory. I don?t know if I will need the m.2 cache yet. But it?s nice to know that upgrade is available any time. As soon as the consistency check is done, I?ll start on the 10.2 TB migration using the migration tool. Then I can see how it works in day-to-day usage. I?m sure it will remain a noticeable step above any of my prior Synology boxes. Now just to get DSM 7.0 on it.

DANIEL Q.

2021-04-05T04:25:42

Rated 5 out of 5

Great performance. Excellent Quality

Very nice. Purchased this as an upgrade to my older Diskstation 1813+ Setup is a breeze, and performances is great.

ROY H.

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Synology DiskStation DS1821+ Specifications

Hardware: CPU

Hardware: CPU

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  • CPU Model

    AMD Ryzen V1500B

  • CPU Architecture

    64-bit

  • CPU Frequency

    4-core 2.2 GHz

  • Hardware Encryption Engine (AES-NI)

    Yes

Hardware: Memory

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  • System Memory

    4 GB DDR4 ECC SODIMM

  • Memory Module Pre-installed

    4 GB

  • Total Memory Slots

    2

  • Maximum Memory Capacity

    32 GB (2x 16 GB)

Hardware: Storage

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  • Drive Bays

    8

  • Maximum Drive Bays with Expansion Unit

    18 (2x DX517)

  • 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

    108 TB

  • Hot Swappable Drive

    Yes

Hardware: External Ports

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  • RJ-45 1GbE LAN Port

    4 (with Link Aggregation / Failover support)

  • USB 3.0 Port

    4

  • eSATA Port

    2

Hardware: PCIe

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  • PCIe Expansion

    1x Gen3 x8 Slot (x4 link)

Hardware: File System

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  • Internal Drives

    Btrfs
    EXT4

  • External Drives

    Btrfs
    EXT4
    EXT3
    FAT
    NTFS
    HFS+
    exFAT

Hardware: Temperature

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  • Operating Temperature

    0 Degree C to 40 Degree C (32 Degree F to 104 Degree F)

  • Storage Temperature

    -20 Degree C to 60 Degree C (-5 Degree F to 140 Degree F)

  • Relative Humidity

    5% to 95% RH

  • Certification

    FCC
    CE
    BSMI
    EAC
    CCC
    KC
    VCCI
    RCM

  • Environment

    RoHS Compliant

Hardware: Others

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  • System Fan

    120 mm x 120 mm x 2 pcs

  • Fan Speed Mode

    Full-Speed Mode
    Cool Mode
    Quiet Mode

  • Easy Replacement System Fan

    Yes

  • Brightness Adjustable

    Yes

  • Power Recovery

    Yes

  • Noise Level

    22.2 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

    59.8 W (Access)
    26.18 W (HDD Hibernation)

  • British Thermal Unit

    204.05 BTU/hr (Access)
    89.33 BTU/hr (HDD Hibernation)

  • Dimensions (H x W x D)

    6.5 x 13.5 x 9.5" (166 x 343 x 243mm)

  • Weight

    13.2 lbs (6kg)

Software: Storage Management

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  • Maximum Internal Volume Number

    64

  • Maximum iSCSI Target Number

    128

  • Maximum iSCSI LUN

    256

  • iSCSI LUN Clone/Snapshot, Windows ODX

    Yes

  • SSD Read / Write Cache

    Yes

  • SSD TRIM

    Yes

  • Supported RAID Type

    Synology Hybrid RAID
    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

    Synology Hybrid RAID
    RAID 1
    RAID 5
    RAID 6
    RAID 10

  • Volume Expansion by Adding a HDD

    Synology Hybrid RAID
    JBOD
    RAID 5
    RAID 6

  • Global Hot Spare Supported RAID Type

    Synology Hybrid RAID
    RAID 1
    RAID 5
    RAID 6
    RAID 10

Software: File Services

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  • File Protocol

    CIFS/AFP/NFS/FTP/WebDAV

  • Maximum Concurrent Connections

    1000
    2000 (with RAM expansion)

  • Windows Access Control List Integration

    Yes

  • NFS Kerberos Authentication

    Yes

Software: Account & Shared Folder

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  • Maximum Local User Accounts

    2048

  • Maximum Local Groups

    256

  • Maximum Shared Folder

    512

  • Maximum Shared Folder Sync Tasks

    16

Software: High Availability

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  • Synology High Availability

    Yes

Software: Log Center

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  • Syslog Events per Second

    800

Software: Virtualization

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  • VMware vSphere 6 with VAAI

    Yes

  • Windows Server 2016

    Yes

  • Windows Server 2019

    Yes

  • Citrix Ready

    Yes

  • OpenStack

    Yes

Software: General Specifications

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  • Networking Protocols

    SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV

  • Supported Browsers

    Google Chrome
    Firefox
    Microsoft Edge
    Internet Explorer 10 onwards
    Safari 10 onwards
    Safari (iOS 10 onwards)
    Google Chrome (Android 6.0 onwards)

  • Supported Language

    Brazilian Portuguese, Czech, Danish, Dutch, English, French, German, Hungarian, Italian, Japanese, Korean, Norwegian, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Swedish, Thai, Traditional Chinese ,Turkish

Software: Add-on Packages

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  • Antivirus by McAfee (Trial)

    Yes

Software: Central Management

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  • Central Management System

    Yes

Software: Synology Chat

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  • Maximum Users

    1500

Software: Document Viewer

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  • Document Viewer

    Yes

Software: Download Station

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  • Maximum Concurrent Download Tasks

    80

Software: exFAT Access

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  • exFAT Access (Optional)

    Yes

Software: Synology MailPlus/Server

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  • Free Email Accounts

    5 (Licenses required for additional accounts)

  • Maximum Number of Concurrent Users

    150

  • Maximum Server Performance

    1,484,000 e-mails per day, approx. 45GB

Software: Media Server

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  • DLNA Compliance

    Yes

Software: Moments

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  • Facial Recognition

    Yes

  • Subject Recognition

    Yes

  • Auto Color & Rotate

    Yes

  • Moments Select

    Yes

Software: Snapshot Replication

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  • Maximum Snapshots per Shared Folder

    1024

  • Maximum of System Snapshots

    65536

Software: Surveillance Station

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  • Maximum IP Cam

    40 (including 2 Free License)

  • Total FPS (H.264)

    1200 FPS @ 720p (1280x720)
    1050 FPS @ 1080p (1920x1080)
    600 FPS @ 3M (2048x1536)
    440 FPS @ 5M (2591x1944)
    320 FPS @ 4K (3840x2160)

  • Total FPS (H.265)

    1200 FPS @ 720p (1280x720)
    1200 FPS @ 1080p (1920x1080)
    1120 FPS @ 3M (2048x1536)
    600 FPS @ 5M (2591x1944)
    480 FPS @ 4K (3840x2160)

Software: Synology Drive

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  • Recommended Number of Hosted Files

    1,000,000 (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 Sync Clients

    550 (the number of connections that can be maintained when the recommended number of hosted files was reached)

Software: Synology Office

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  • Maximum Users

    1800

Software: Video Station

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  • Video Station

    Yes

Software: Virtual Machine Manager

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  • Recommended Virtual Machine Instances

    8

  • Recommended Virtual DSM Number

    8

Software: VPN Server

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  • Maximum Connections

    30

  • UPC Code

    846504003976

8 Accessories for Synology Diskstation DS1821+ 8-Bay NAS Enclosure, 4-Core 2.2GHz, 4GB RAM, No HDD

  • All Accessories (8)
  • SSD Drives (3)
  • Drives & Storage (2)
  • Ram (1)
  • Cables & Adapters (2)

About Synology DiskStation DS1821+

FEATURED REVIEWS

The best upgradeable pro-Sumer SMB NAS.

By RICK W.

If you are, like me, used to the DSM Operating system interface that Synology has developed then you are likely not just shopping across brands for the most powerful NAS. Because Synology is a big wimpy at times. BUT their software is great and their hardware nothing to sneer at albeit not leading edge. The DS1821+ Has strong expansion options. I added 2 x sn700 nvme cache modules. And 2x 32gb ecc memory and it recognizes it all and runs excellent. What took days on my DS1517 now takes me...

View full Review

Excellent NAS

By Paul A.

Excellent NAS. I only wish it had a faster processor with more PCIe lanes.

You can elevate your data storage and management with the Diskstation DS1821+ 8-Bay NAS Enclosure. This high-performance device, powered by a 4-Core 2.2GHz AMD Ryzen processor and 4GB RAM, is designed for IT enthusiasts and small to medium-sized businesses seeking a robust and scalable storage solution.

The DS1821+ is equipped with dual M.2 2280 slots for NVMe Cache, delivering an impressive performance of 113K 4K random read IOPS1. This powerhouse device can handle demanding application workloads and accommodate a higher number of concurrent users, ensuring faster file indexing in Synology Drive and more responsive web services.

The device's scalability is a standout feature, allowing you to expand up to 18 drives with two DX517 expansion units. This makes it an ideal solution for businesses that require high-capacity storage. The DS1821+ also supports ultra-fast NVMe cache to accelerate HDD arrays by 20X or more, and 10GbE support for faster SFP+ or RJ-45 networking to turbocharge existing workflows.

The DS1821+ is more than just a storage device. It offers an ultimate file management and sharing solution with File Station, a web-based tool that allows easy drag-and-drop operations without complex setup on Mac or PC. For seamless compatibility, it supports various protocols including AFP, FTP, iSCSI, NFS, SMB, and WebDAV.

This NAS enclosure also integrates various backup applications into an intuitive user interface, offering durable storage technologies to safeguard your valuable data on any device. It supports Active Backup for Business, Hyper Backup, and Synology Drive, ensuring fast and reliable data recovery when needed.

The DS1821+ is also a fully certified storage virtualization solution, supporting most virtualization solutions to enhance work efficiency. It integrates with VMware vSphere 6 and VAAI to offload storage operations and optimize computation efficiency, while Windows Offloaded Data Transfer (ODX) speeds up data transfer and migration rate.

The device is powered by Synology DSM Central Management System, allowing you to manage multiple Synology NAS servers simultaneously on a centralized interface. It also offers a secure, reliable, and private mail server solution with Synology MailPlus, and a comprehensive surveillance solution with Surveillance Station.

The Diskstation DS1821+ 8-Bay NAS Enclosure is not just a storage device, but a comprehensive solution for data management, backup, and virtualization, designed to meet the demands of modern businesses.

Synology DiskStation DS1821+ Features

  • Accelerated Performance
  • Maximize Performance
  • Expansion Made Easy
  • Includes Everything to Protect Your Data
  • Ready for 10GbE

Product Documents

User Manual

Key Features

  • Harness the power of this 8-Bay NAS enclosure for robust data security and peace of mind.
  • Experience fast performance with the 4-Core CPU, perfect for demanding applications and workflows.
  • Set up your Synology Diskstation quickly and easily, even without advanced technical skills.
  • Access your files remotely from anywhere, ensuring your data is always within reach when needed.
  • Utilize RAID support for enhanced data protection and redundancy, safeguarding against drive failure.
  • Expand your storage capacity with ease, supporting up to 18 drives for future growth.

What's in the box:

  • Diskstation DS1821+ 8-Bay NAS Enclosure
  • Accessory Pack
  • AC Power Cord
  • 2x RJ-45 LAN Cable
  • Quick Installation Guide
  • Synology 3 Year Limited Warranty