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Synology DS1821+ Review: Performance and Value Analysis

  • NAS
  • 13 min read
synology ds1821 performance analysis

The Synology DS1821+ impresses with its AMD Ryzen V1500B CPU, dual M.2 NVMe slots, and SSD cache acceleration for enhanced performance. It boasts versatility in NVMe slot configurations and read-intensive operations, ideal for critical business tasks. Constructed robustly with 4 GB DDR4 ECC RAM and expandable to 18 bays, it caters to diverse storage needs. Users benefit from impressive SSD performance, expandable RAM, and a sturdy build, though compatibility issues with non-Synology components and advanced troubleshooting may pose challenges. Its scalability and reliable performance make it a top choice for businesses and advanced users seeking efficient storage solutions.

Key Takeaways

  • Impressive SSD cache acceleration for enhanced performance and reduced latency.
  • Scalability up to 18 bays with DX517 expansion units for flexible storage options.
  • Robust AMD Ryzen V1500B Quad-Core CPU for consistent speed and responsiveness.
  • Versatile usage scenarios for businesses, photographers, and diverse storage needs.
  • High-quality build, expandable RAM, and reliable performance make it a valuable investment.

With the AMD Ryzen V1500B Quad-Core 2.2 GHz CPU at its core, the Synology DS1821+ offers a robust computing platform for handling diverse network storage needs efficiently. Performance benchmarks showcase the enhanced speed and responsiveness, making it ideal for data-intensive tasks. The reliability of the system guarantees uninterrupted operation, critical for businesses reliant on continuous access to their data. Customization options such as expanding RAM or adding SSD cache provide flexibility tailored to specific requirements. Data security is paramount, and the DS1821+ excels in this aspect, offering advanced encryption and access control features. These elements combined make the Synology DS1821+ a top choice for those seeking a high-performing, customizable, and secure network storage solution.

Features and Benefits

The Synology DS1821+ offers users the advantage of dual M.2 NVMe slots, providing the option to enhance the system with SSD cache for improved performance. With various NVMe slot configuration options available, users can tailor the setup to meet their specific needs, whether it be for storage acceleration or increased data throughput. The flexibility in NVMe slot configurations adds versatility to the DS1821+ NAS, catering to diverse requirements for storage, backup, or surveillance applications.

Dual M.2 NVME Slots

Embedded within the Synology DS1821+ are two M.2 NVMe slots that enhance the system's storage capabilities through high-speed SSD caching. The utilization of NVMe SSDs in these slots greatly boosts SSD performance, enabling quicker access to frequently used data and applications. By leveraging these slots for SSD caching, users can optimize storage performance, especially in read-intensive operations, leading to enhanced overall system responsiveness. This setup allows for efficient storage optimization by offloading frequently accessed data onto the faster NVMe SSDs, freeing up the primary storage drives for other tasks. The inclusion of dual M.2 NVMe slots in the DS1821+ provides a valuable opportunity for users to enhance their storage infrastructure with improved speed and responsiveness.

SSD Cache Enhancement Option

How does the SSD cache enhancement option in the Synology DS1821+ NAS contribute to optimizing storage performance and overall system responsiveness? The SSD cache performance of the DS1821+ plays an essential role in accelerating data access by storing frequently accessed data in high-speed SSDs. By leveraging SSD cache optimization, the NAS can efficiently handle workloads, reducing latency and enhancing overall system responsiveness. This feature greatly improves read and write speeds, particularly for tasks that involve accessing small or random data, resulting in a smoother user experience. The SSD cache enhancement option is a valuable tool for maximizing the performance capabilities of the DS1821+ NAS, making it a compelling choice for users seeking high-speed data access and efficient storage operations.

NVMe Slot Configuration Options

Within the storage configuration of the Synology DS1821+ NAS, the NVMe slot offers versatile options for optimizing data access and performance. By utilizing NVMe SSDs in these slots, users can greatly enhance SSD performance by leveraging faster read and write speeds compared to traditional hard drives. This setup allows for efficient caching mechanisms, accelerating data retrieval for frequently accessed files and applications. The NVMe slot configurations enable users to tailor their storage optimization strategies according to their specific performance requirements, ensuring a balance between speed and capacity. With the ability to configure NVMe slots for different purposes such as read-only cache, read-write cache, or raw SSD storage, the DS1821+ offers a flexible solution to meet diverse storage needs.

NVMe Slot Configurations

Given the versatile storage optimization opportunities presented by the NVMe slot configuration within the Synology DS1821+ NAS, users can strategically enhance data access and performance by harnessing the capabilities of NVMe SSDs. The NVMe slots offer a significant advantage in performance optimization, allowing for storage acceleration through high-speed SSD caching. By utilizing NVMe SSDs in these slots, users can experience improved read and write speeds, reduced latency, and overall enhanced system responsiveness. This configuration enables users to maximize the potential of their NAS, particularly in scenarios where rapid data access is essential. The ability to leverage NVMe technology in the DS1821+ ensures efficient data management and seamless operation for various demanding workloads.

Product Quality

The Synology DS1821+ excels in product quality, showcasing robust construction and reliable performance that meet the demands of both home users and small to medium-sized businesses. Its reputation for product reliability is reinforced by positive user satisfaction, with many users reporting seamless experiences and high levels of satisfaction. The attention to detail in design and the use of quality components contribute to the overall high standard of the device. Users can rely on the DS1821+ to deliver consistent performance and durability, making it a preferred choice for those seeking a reliable network-attached storage solution. This commitment to quality guarantees that the DS1821+ meets the expectations of users across various usage scenarios.

What It's Used For

The Synology DS1821+ serves as a versatile storage solution, offering a wide range of practical applications for both home and business users. This NAS device provides a detailed functionality overview, showcasing its flexibility in various scenarios. From storage and backup tasks to surveillance and more, the DS1821+ caters to diverse use cases with its robust features and expandable design.

Functionality Overview

Functionality of the Synology DS1821+ encompasses a versatile range of applications, making it a robust solution for storage, backup, surveillance, and more. When compared to previous models, the DS1821+ stands out due to its AMD Ryzen V1500B Quad-Core 2.2 GHz CPU, providing improved performance and efficiency. The device supports up to 8 hard drives or SSDs, with the option for expansion up to 18 bays using DX517 units. Dual M.2 NVMe slots allow for SSD caching, enhancing speed and responsiveness. Users can benefit from a wide array of software applications included, further expanding the capabilities of this NAS. Overall, the DS1821+ offers a wide range of features suitable for diverse storage and data management needs.

Use Cases Breakdown

Encompassing a diverse array of functions, the Synology DS1821+ serves as a versatile storage solution catering to a wide range of data management needs. Its use cases span across various practical applications such as centralized file storage for businesses, data backup and synchronization, multimedia streaming, virtualization storage, and surveillance footage storage. The DS1821+ is well-suited for small to medium-sized businesses requiring reliable data storage and protection. It can also serve as a personal cloud storage solution, allowing users to access their files remotely. Additionally, with its expandable storage capacity and robust performance capabilities, the DS1821+ is adept at handling demanding workloads, making it an ideal choice for users seeking a comprehensive storage solution that can adapt to evolving needs.

Practical Applications

With its robust feature set and versatile design, the Synology DS1821+ excels in a multitude of practical applications, making it a valuable asset for businesses and individuals alike. In real-world scenarios, the DS1821+ proves to be an ideal solution for file storage and sharing, data backup, virtualization environments, multimedia streaming, and surveillance systems. Its ability to accommodate up to 8 hard drives or SSDs, along with dual M.2 NVMe slots for SSD cache, provides flexibility for varying storage needs. Furthermore, the expandable nature of the DS1821+ up to 18 bays with DX517 expansion units allows for scalability as requirements grow. This versatility makes the DS1821+ a versatile and reliable choice for a wide range of applications.

Product Specifications

The Synology DS1821+ 8-Bay Diskstation NAS is equipped with an AMD Ryzen V1500B Quad-Core 2.2 GHz CPU and accommodates up to 8 hard drives or SSDs, making it a powerful and versatile storage solution. This NAS also features dual M.2 NVMe slots for SSD cache, enhancing storage performance. Below is a table highlighting key specifications of the Synology DS1821+:

CPUAMD Ryzen V1500B Quad-Core 2.2 GHz
Network Connectivity4 x 1 GbE RJ-45 LAN Ports
Drive CapacityUp to 8 hard drives or SSDs
Expansion CapabilityDual M.2 NVMe slots for SSD cache

Who Needs This

Ideal for businesses and advanced home users seeking a robust and scalable storage solution, the Synology DS1821+ offers a wide-ranging feature set tailored to meet various storage and data management needs. Small businesses can benefit from its expandability, allowing for up to 18 bays with DX517 expansion units, accommodating growing data requirements. The DS1821+ is also well-suited for photographers who need a reliable and high-capacity storage solution for their large image files. With dual M.2 NVMe slots for SSD cache, this NAS device can enhance performance when handling extensive photo libraries. Its multiple LAN ports provide flexibility for network connectivity, catering to the needs of users with diverse storage demands.


Strengths of the Synology DS1821+ include its robust hardware configuration and versatile software ecosystem, making it a compelling choice for users with diverse storage needs. When considering the pros of this NAS device, the following stand out:

  1. SSD Performance: The DS1821+ offers impressive SSD performance, especially when utilizing the dual M.2 NVMe slots for SSD cache acceleration.
  2. RAM Expansion: Users can easily expand the RAM of the DS1821+ for enhanced performance, ensuring seamless multitasking and responsiveness.
  3. High-Quality Build: The NAS is well-built, ensuring durability and reliability for long-term use.
  4. Scalability: With the ability to expand up to 18 bays using DX517 expansion units, the DS1821+ provides scalability for growing storage needs.


Despite the impressive strengths of the Synology DS1821+, there are specific drawbacks that users should consider before making a purchase decision. These cons include:

  1. Compatibility issues: Users may encounter compatibility problems when using non-Synology RAM modules or third-party components with the DS1821+.
  2. Troubleshooting tips: Resolving technical issues or setting up certain configurations might require advanced troubleshooting skills or assistance from Synology support.
  3. Limited warranty: The standard warranty period may not be sufficient for some users, especially those seeking longer coverage or additional support options.
  4. Cost: While the DS1821+ offers good value for its performance, the initial investment and potential additional costs for upgrades or expansions can be significant.

What Customers Are Saying

Customers have expressed their satisfaction and praise for the performance and versatility of the Synology DS1821+ NAS, highlighting its seamless integration into various operational environments. Feedback indicates high levels of customer satisfaction with the product's performance, particularly when compared to older Synology models. Users appreciate the improved processing power provided by the AMD Ryzen V1500B Quad-Core 2.2 GHz CPU, enhancing overall system responsiveness. Additionally, customers have noted the benefits of upgrading RAM to further boost performance, enabling smoother operation during data-intensive tasks. The DS1821+ has garnered positive reviews for its expansion capabilities, allowing for easy scalability with additional components. Overall, customer testimonials emphasize the NAS's ability to meet diverse storage needs efficiently and reliably, supporting its reputation for performance excellence.

Overall Value

The demonstrated performance and scalability of the Synology DS1821+ NAS align seamlessly with its overall value proposition, emphasizing its capacity to efficiently meet diverse storage requirements while maintaining high levels of operational reliability. When conducting a value analysis, the DS1821+ excels in providing a good price-performance ratio, making it an attractive option for users looking for a reliable and high-performing NAS solution. In performance comparison with older models, the inclusion of the AMD Ryzen V1500B Quad-Core CPU showcases improved processing power, while the expandability options, such as dual M.2 NVMe slots for SSD cache and the ability to accommodate up to 18 bays with expansion units, further enhance the overall value proposition of the DS1821+.

Tips and Tricks For Best Results

For peak performance and improved functionality with the Synology DS1821+ NAS, implementing strategic configurations and settings can greatly elevate the overall user experience. One vital aspect to contemplate is RAM optimization. Upgrading the DDR4 ECC SODIMM from the standard 4GB can greatly enhance the system's performance, particularly when handling multiple tasks simultaneously or running resource-intensive applications. By fine-tuning performance settings, users can guarantee that the AMD Ryzen V1500B Quad-Core 2.2 GHz CPU operates at its optimal capacity, delivering smooth and efficient operations. Additionally, exploring the various performance tuning options available within the Synology DiskStation Manager can further enhance the NAS's capabilities, allowing for seamless data management and access.


In summarizing the thorough evaluation of the Synology DS1821+ NAS, it becomes evident that its versatile features, robust performance, and seamless scalability make it a standout choice for diverse storage and data management needs. User feedback has highlighted the improved performance of the AMD Ryzen CPU compared to older models, with recommendations for upgrading RAM further enhancing its capabilities. The DS1821+ offers a good price-performance ratio, providing value through expandable options like additional cache and RAM. Technical details showcase the CPU's performance and RAM compatibility, although challenges may arise with non-Synology components. Overall, the DS1821+ excels in performance comparison, user feedback, and overall value, solidifying its position as a top-tier NAS solution.

Frequently Asked Questions

Can I Use Third-Party SSDS in the M.2 Slots for Cache?

Yes, the Synology DS1821+ supports third-party SSDs in the M.2 slots for cache, enhancing performance. Although compatibility may vary, third-party options can provide cost-effective alternatives. Performance comparison between Synology's and third-party SSDs is recommended for best results.

Is It Possible to Upgrade the CPU in the Ds1821+?

Upgrading the CPU in the Synology DS1821+ is not feasible due to its integrated design. Attempting a CPU upgrade could lead to compatibility concerns, affecting system stability and performance. It is recommended to explore other performance enhancement options.

How Many Surveillance Cameras Can This NAS Support?

The Synology DS1821+ NAS supports up to 40 surveillance cameras, enabling a thorough surveillance setup. Camera compatibility is essential for effective monitoring. Guarantee seamless integration of cameras with NAS for excellent surveillance performance and data management.

Does the Ds1821+ Support Virtualization Applications?

The Synology DS1821+ supports virtualization applications, enabling users to run multiple virtual machines efficiently. With its AMD Ryzen CPU, performance surpasses older models. Enhanced by expandable RAM and storage, it offers robust capabilities for diverse workloads.

Are There Any Compatibility Issues With Certain HDD Brands?

Certain HDD brands may encounter compatibility issues with the Synology DS1821+. Performance may vary based on drive specifications. Utilizing third-party SSDs can enhance caching benefits, improving overall system performance. It is advisable to verify compatibility before installation.

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