Synology DVA1622 NAS Review – The BEST Synology 2-Bay?
Welcome to our review of the Synology DVA1622 surveillance NAS, a device that stands out from the crowd with its impressive AI-assisted features, yet still runs on the well-known DiskStation Manager (DSM) platform. Synology has made a name for itself in the NAS arena, and their devices are often the first choice for those venturing into home or business network-attached storage. One of Synology’s standout features is the inclusion of its award-winning Surveillance Station NVR/CCTV software, currently at version 9.1, with all its NAS devices.Ho wever, the degree to which you can leverage the Surveillance Station depends heavily on the hardware specifications of your NAS. Here’s where the Synology DVA series, including the DVA3221 and our focus today, the DVA1622, sets itself apart. These devices utilize AI to analyze surveillance camera feeds live, offering features like person, vehicle, face, and license plate recognition, as well as people and vehicle counting, intrusion zone detection, and more. At a price tag of $599, the DVA1622 is about $199 more expensive than the more traditional DSM NAS systems such as the Synology DS720+ and DS723+ 2-Bay. But it offers additional surveillance services and comes with 8 camera licenses, compared to the 2 licenses typically included with other NAS devices. The question we’ll be answering in this review is: does the DVA1622 justify the extra cost with its enhanced surveillance capabilities? Stay tuned to find out.
Synology DVA1622 NAS Review – Quick Conclusion
In conclusion, the Synology DVA1622 makes a compelling case for being the best 2-Bay NAS from Synology, despite its price increase over the DS720+ and DS723+. Its ability to run DSM 7.2 on par with its counterparts, while also executing Surveillance Station exceptionally well, sets it apart from the crowd. The added benefits of AI recognition, live AI analysis of recordings, people counting, and intelligent intrusion guidelines are features that can be invaluable to businesses and home users who prioritize their security. Along with these perks, the 8 included surveillance licenses, a significant bump from the 2 that come with other Synology NAS devices, provide excellent value, considering they would cost around $200-250 on their own. The integrated graphics within its CPU offers enhanced multimedia playback capabilities, not only in DSM but also in HEVC recordings in Surveillance Station 9.1. Additionally, the local HDMI/KVM support grants standalone surveillance access, a feature rarely found in other Synology NAS devices. The DVA1622 outclasses the DS720+ by coming with 6GB of memory in its default model, compared to their 2GB. This robust offering, combined with the excellence of Surveillance Station 9.1, one of the world’s best surveillance software, enables the DVA1622 to deliver one of the best experiences of this software. Access to both DSM and Surveillance Station on the DVA1622 equips you with a full suite of NVR/CCTV services, as well as the backup, syncing, sharing, and security capabilities of DSM 7.2. However, the device isn’t without its limitations. It has only two USB ports, which may limit your flexibility for KVM setup with the HDMI and other USB-dependent tasks. Its single 1GbE port could potentially bottleneck your network, especially when running extensive camera setups and other network-heavy tasks. Additionally, the maximum memory of 6GB could hit a ceiling if you are running several services in DSM 7.2, operating 16 cameras, and managing 2 AI tasks simultaneously, considering the CPU supports up to 8GB. The lack of expandability with the Synology DX517 expansion chassis also limits storage potential, with a 2-Bay NAS typically implying a RAID 1 setup and halving the possible maximum storage. Despite these limitations, the DVA1622 stands as an excellent choice for a 2-Bay NAS. It is highly recommended for both surveillance and standard Synology DSM usage. However, it is essential to remember its lack of local connectivity and scalability when compared to the DS723+, which offers 32GB maximum.
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Synology DVA1622 NAS Review – Packaging
The retail packaging for this product follows the typical Synology style, characterized by its simplicity and focus on sustainability. The materials used are almost entirely recyclable, reducing the environmental impact of the product’s packaging. The box is clearly labeled, showing exactly what’s inside, and offers comprehensive details about the system’s unique surveillance capabilities, printed on each edge of the box.
The box and internal structure are made just of cardboard, which aligns with Synology’s commitment to eco-friendly practices. However, this material choice, while great for the environment, does mean that the box is somewhat flimsy and may not hold up well under rough handling. But, it’s worth noting that the relatively lightweight nature of the Network Attached Storage (NAS) unit itself means this isn’t a significant problem in most shipping contexts.
This is a rather light NAS, and it’s shipped without any drives installed, so the flimsiness of the box is not much of an issue during shipping, realistically speaking. Despite the somewhat fragile nature of the packaging, the NAS unit should be perfectly secure within the box throughout the shipping process, given its light weight and the protective packing materials used. Therefore, the packaging’s environmental friendliness outweighs any minor concerns about its durability.
Inside the box, you’ll find a familiar assortment of accessories that typically come with any Synology 2 Bay NAS. This includes a 60W PSU, an RJ45 Cable, screws, manuals, information about the 3-year warranty, tray keys, and of course, the DVA1622 NAS unit itself. These components are all essential for setting up and using the DVA1622, ensuring that users have everything they need to get started.
The power supply unit (PSU) is an external 60W brick, which is branded with the Synology logo. This kind of PSU is fairly standard for compact, desktop, 2-bay HDD NAS systems. It’s designed to provide reliable and consistent power to the NAS, ensuring optimal operation and longevity of the unit. As a whole, the retail kit may come across as a bit mundane, but it is nonetheless sturdy and mindful of the environment. More importantly, it includes all the components that most users will need to set up and start using the DVA1622. The only thing missing, as is standard with NAS units, is the storage media which users can choose based on their specific requirements.
Synology DVA1622 NAS Review – Design
The design of the DVA1622 takes a lot of inspiration from the Synology DS720+ and DS723+ NAS units. These two models are less focused on surveillance but still fall under the category of prosumer 2-Bay NAS solutions. Despite borrowing heavily from these designs, the DVA1622 does feature its own unique elements tailored for its surveillance-oriented functionality.
The outer casing of the DVA1622 is made entirely of plastic, although it does incorporate a metal internal framework for added durability. It measures 166 mm x 106 mm x 223 mm, making it a compact device, and without drives, it weighs just 1.5KG. This combination of dimensions and weight makes the DVA1622 portable and convenient to place in various locations.
The DVA1622 is well-ventilated, featuring vents on nearly all its sides. These vents are strategically placed around the main storage bays, there’s a controller board vent on the base, and even the Synology logo on either side is vented. This level of ventilation, combined with the active rear fan, allows for effective cooling during round-the-clock operation.
This NAS features two storage bays that are designed to be hot-swappable. This allows users to replace or upgrade drives without having to shut down the system, providing seamless operation. The DVA1622 can run either half or fully populated with SATA Hard Drives or SSDs, providing users with a certain degree of flexibility in configuring their storage.
The drive trays utilize a click and load design, meaning no screwdriver is required for installation unless SSDs are used. This design feature simplifies the process of setting up and upgrading drives, making the DVA1622 more user-friendly. Furthermore, it officially supports up to 18TB HDDs from manufacturers like Seagate, WD, Toshiba, and Synology’s own HAT5300 and HAT3300 drives, though testing also showed compatibility with 20TB and 22TB HDDs from WD and Seagate.
One notable omission from the DVA1622’s design is the lack of any M.2 NVMe SSD bays. These bays are typically used for installing faster storage devices for caching or tiered storage. However, the inside of the Synology DVA1622 does have the PCIe connector that usually hosts the m.2 board, as seen in the DS720+/DS723+ models.
At the front of the system, there’s a USB port intended for local backups. This is a convenient feature for users who want to secure their data through physical backups. To make this process easier, the DSM operating system on the NAS provides several apps, like USB Copy and Hyper Backup, that can automatically manage these backups.
Unlike some other models, the DVA1622 doesn’t feature an LCD panel. Instead, it opts for LEDs that indicate the health of the system, drives, and network. These LEDs can be dimmed or deactivated as needed, offering users the ability to customize the system’s visual alerts based on their preferences.
The external design of the DVA1622 largely mirrors that of the DS720+/DS723+. The similarities in design language are evident, with differences mainly lying in the specific features each model offers. To understand the real differences between the DVA1622 and the DS720+/DS723+, it’s necessary to look at the ports, which also account for the approximate $199 price difference between the models.
Synology DVA1622 NAS Review – Ports and Connections
The DVA1622’s ports present a mix of positive and negative aspects, especially when compared with other 2-Bay NAS models in the market. There are numerous ports to accommodate various needs, but some users may find certain aspects lacking. Despite this, it provides a satisfactory range of connectivity options for the average user.
Like other models, the DVA1622 has the same single 80mm rear fan. This fan’s RPM automatically adjusts according to the system’s temperature requirements, which aids in maintaining optimal operating conditions. If necessary, users also have the option to manually adjust the fan’s speed.
The system only features a single network connection, unlike the DS720+ which has dual LAN. This means features like SMB multichannel, port trunking, and network failover aren’t possible with the DVA1622. The lack of a 10GbE upgrade option, which is present in the DS723+ NAS, is another difference.
The 1GbE network connection isn’t a significant dealbreaker, but having up to 16 cameras sharing this connection and the system’s up/down access by sys admins might be a concern for users operating higher-quality cameras in Surveillance Station 9. This could become a problem particularly if they’re on ’24×7 recording and alerts’ mode. Therefore, users would need to carefully consider their surveillance needs before deciding on the DVA1622.
This system supports KVM, with an HDMI 2.0 (4K 60FPS) output, which can exclusively be used for Surveillance Station. This means that in addition to local network and remote access to the surveillance setup, users can have local/direct access whenever necessary. This can be beneficial for faster/high-quality feed access or in the event of network issues.
One downside is that there’s another USB port, which means for a keyboard/video/mouse local standalone setup (which is the precise reason for the HDMI support here), you would lose all USB access unless you use a hub. This could potentially limit the system’s functionality in certain setups. Therefore, users would need to keep this limitation in mind when planning their setup. Another design decision that might be disappointing for some users is the lack of an expansion slot. Both the DS720+ and DS723+ have eSATA ports for the DX517 expansion chassis, which allows for the addition of 5 more bays. This means users of the DVA1622 are limited to the built-in storage bays, which could constrain their storage capacity, especially considering the likelihood of using a RAID1/SHR setup that effectively halves storage potential.
Given that this is a 2-Bay NAS, the scope for archiving your recordings is somewhat limited, presenting a lower glass ceiling than many non-surveillance NAS. This could be a concern for users who need a large amount of storage for long-term archiving of high-definition surveillance footage. However, for users with moderate storage needs, this should not be a significant issue. Overall, the ports and connections of the DVA1622 are satisfactory, but there are many missed opportunities in scalability for network bandwidth and storage that other Synology 2-Bay NAS models handle better. Therefore, users looking for greater scalability may want to consider other options. It’s now time to delve into the specifics of the internal hardware.
Synology DVA1622 NAS Review – Internal Hardware
Internally, the DVA1622 uses a setup that’s almost identical to the Synology DS720+ released in 2020, but with a few notable differences. One difference is that it lacks the m.2 connections but has a higher base memory. This gives the DVA1622 a unique combination of features that differentiate it from other models.
The DVA1622 is powered by an x86 Intel J4125 Celeron CPU, which operates at a speed of 2.0-2.7Ghz, features integrated graphics, and has a 4-Core, 4 Thread configuration. This CPU has been heavily used by Synology in other releases, including the DS423+ model. However, it is beginning to show its age a little now.
Unlike the Intel Atom powered DVA3221 4-Bay (which boasts an NVIDIA GeForce GTX 1650 graphics card), the DVA1622 relies on the CPU’s integrated graphics for its AI surveillance tasks. This limits the number of active AI deep analysis tasks to 2x at any given time, compared to the 8-12x tasks that the DVA3221 can handle. But it’s worth noting that despite this limitation, the DVA1622 still offers impressive performance for most use cases.
It’s important to note that the DVA1622 can also run everything in DSM, Synology’s operating system. This allows users to enjoy a full and polished DSM 7.2 experience in addition to their Surveillance Station 9.1 experience. This makes the DVA1622 an attractive option for users who want a versatile NAS that’s capable of handling a wide range of tasks.
The DVA1622 comes with 6GB of non-ecc, Synology-branded DDR4 memory. While this is slightly odd considering the CPU supports up to 8GB (and Synology supported up to 6GB in the DS720+), it is a nice step up from the 2GB the DS720+ arrived with by default. This additional memory can prove beneficial in handling simultaneous tasks. One of the standout features of the DVA1622 is its deep learning AI capability. This feature enables advanced image recognition and analysis, making it a powerful tool for security surveillance applications. Despite its few limitations and a higher price tag compared to its non-surveillance counterparts, the DVA1622 still holds significant appeal for users looking for a compact, user-friendly NAS with impressive surveillance capabilities
Synology DVA1622 NAS Review – DSM 7.2 and Surveillance Station 9.1
The Synology DVA1622 Surveillance NAS Server has been specifically designed to optimally perform with Synology Surveillance Station, which is currently on version 9.1.1. The DVA1622’s seamless integration with Surveillance Station delivers an advanced functionality that far surpasses the features provided by non-edge-AI-recognition NAS servers.
The DVA1622, when synchronized with Surveillance Station, supports a multitude of services that dramatically elevate your surveillance experience. It enables access to live feed from multiple cameras (monitoring center), which can be configured to accommodate several cameras on screen simultaneously. Moreover, it allows for simultaneous viewing of live feeds and previous recordings within the software.
Additionally, the Surveillance Station allows for the application of privacy masks and watermarks on the feed. It also facilitates the upload of eMaps and integrates seamlessly with third-party mapping services like Google Maps and OpenMaps.
Surveillance Station isn’t merely confined to NAS server support. It extends control to IP speakers, door controls, and I/O supported peripherals. Users can access the system swiftly and intuitively via a mobile app, even transforming their mobile into another surveillance feed with Synology Live Cam. The system also supports alerts and push notifications for specific events, and generates downloadable analytical reports.
The Surveillance Station expands its functionality through a host of additional add-ons. These include YouTube Live Streaming, video integrity tools, transaction checking, and IFTTT/Webhook services.
It also includes features like motion detection, missing object detection, idle zone monitoring, and foreign object area tagging. Access to the Surveillance Station is conveniently provided through web browsers, desktop clients, and mobile clients, either over the local network or remotely.
One standout feature is Smart Lapse creation, which enables you to condense extensive recording periods into rapid sequences. This tool allows you to condense a full day’s footage into a few minutes for quick scanning. Additionally, the DVA1622 supports cloud recording with Synology C2 Surveillance (available with a free trial, then on a subscription basis).
The Surveillance Station also includes a Home Mode, which automatically initiates camera schedules when a defined user exits or enters the premises using WiFi links. More details on these features can be found in our review of Synology Surveillance Station 9.1 on our YouTube channel below.
The DVA1622 NAS server, in collaboration with Surveillance Station, supports advanced AI detection techniques such as people detection, vehicle detection, intrusion detection, crowd detection, and loitering detection. It also incorporates a Smart Search feature that lets you search a predefined area of a recorded feed for specific incidents.
Vehicle Detection – Similar to human detection capabilities, the DVA1622 NAS server extends its intelligent recognition to vehicles as well. This feature proves especially useful when the premises are closed, and an unexpected vehicle enters the vicinity. The surveillance system can be programmed to provide ‘out of hours’ alerts, notifying owners whenever vehicles approach their premises during closed or off hours. This is an excellent way to ensure the security of your property when you’re not physically present.
Intrusion Detection – The DVA1622 takes intrusion detection up a notch with its advanced features. Users can draw lines on the feed that can have multiple bend or break points, marking out specific areas as off-limits. This allows the system to monitor if people or vehicles cross into these forbidden zones. Thanks to edge AI recognition, you can customize this feature to suit your needs—for example, allowing an area to be entered by people but not vehicles or vice versa. This level of customization helps create ‘no go’ zones at specific times, further enhancing the security of your premises.
Crowd Detection – The DVA1622’s recognition capabilities extend beyond just humans and vehicles. It also offers nuanced crowd detection. For instance, the system could be programmed to ignore one or two people in a predefined area. However, if that number increases to five or six, it could trigger an alert. This crowd detection feature enables you to set thresholds for alerts based on the number of people in a particular area, ensuring you’re notified only when necessary.
Loitering Detection – Similar to crowd detection, loitering detection is another impressive feature of the DVA1622. This function enables the server to alert you when an individual or vehicle remains within a predefined area for an unusually long period. People just passing by won’t trigger an alert, but if they loiter around for a while, the system will notify you. This helps you keep an eye on any potential suspicious activity around your premises.
Smart Search – This feature significantly enhances the surveillance process by allowing you to focus on a specific area within recorded feeds. For instance, you can set the system to alert you of any movement, person, or vehicle in a predetermined spot, such as a door, desk, or window. By combining Smart Search with Smart Time Lapse, you can sift through weeks of recordings in a fraction of the time, automatically identifying any noteworthy events in a particular spot. It allows you to retroactively apply advanced surveillance parameters, even if they weren’t set up at the time of recording.
In the last few months, Synology have rolled out their own Surveillance cameras in the BC500 and TC500, both of which arrive with edge AI recognition and do not require a surveillance camera license in use with a NAS (DVA1622 included). This has arguably undermined some of the appeal and value of deep video analysis NAS such as the DVA1622, however these cameras have one very significant limitation. For instance, they do not support database storage. They cannot store a reference of specific people or faces and vehicle registrations for future comparison when they appear in the feed, allowing alerts to be scaled accordingly.
To access this kind of functionality, a DVA system such as the Synology DVA1622. or DVA3221 4-Bay is necessary. Similarly, the Synology Cmaeras cannot keep track of the number of people or objects crossing the set intrusion lines, making it impossible to maintain an accurate count—for instance, knowing who is in or out during a fire alarm. This is where live AI analysis NAS like the DVA1622 shine.
Recordings are sent via HTTPS/SRTP encryption to the NAS, encrypted when recorded to the local memory, and remain encrypted when backed up on the Surveillance C2 cloud service. In conclusion, while the DVA1622 Surveillance NAS Server may not match more expensive Deep Video Analysis systems like the DVA3221, its unique features compared with other more affordable 2-bays, yet inclusive 8 licenses and surveillance AI analysis tasks make it a compelling choice.
However, it’s worth keeping in mind that there is more to the DVA1622 NAS than Surveillance Station, as it also includes the full DSM 7.2 applications and services. Now, to cover the WHOLE Synology DSM software and services that are included with the DVA1622 NAS would result in a review that is twice as long as this review so far! Synology’s Diskstation Manager software that comes with this device (either DSM 7 or DSM 6.2 depending on your preference) provides a massive arrangement of services, applications (first and third-party supported) and a huge number of client applications for Desktop clients, Mobile, Windows, Mac and Linux (as well as a bunch of other more home-based tools). These allow management and access to the data on the DVA1622 in very tailored ways, as well as the web browser-based access that has the appearance, intuitive design and responsiveness of a local operating system. The DSM interface can be accessed by hundreds of users at the same time (with each user having tailored access, rights and privileges). DSM is available with ALL Synology NAS and the depth and abilities of DSM on any NAS are dependent on the hardware architecture of the NAS itself. In the case of the Synology DVA1622, it supports practically EVERYTHING (with the exception of SHR, as previously mentioned). If you want to learn about the latest version of DSM 7 and the software and services that are included with the DVA1622 NAS, watch my FULL review below (alternatively, you can read the DSM 7 Full Review HERE):
As mentioned, the DVA1622 supports pretty much the entirety of the DSM 7 and DSM 6.2 applications and services. If you are an existing user of SaaS and PaaS (Software as a service and Platform as a service) from the likes of Google Workspace and Office 365, knowing that you can synchronize these systems or choose to export away from them onto the Synology services is going to be very appealing. Key business applications that are included with your NAS are:
Synology Office – Create documents, spreadsheets, and slides in a multi-user environment. Real-time synchronization and saving make collaboration a breeze. This allows you to view and edit your office documents in a native Synology application (no internet access needed) and keep all file management and handling internally.
Synology Cloud Sync – This allows you to connect and synchronize the data you may have on your 3rd party cloud platform to be accessible on the NAS (as well as allow a 1 way or 2 way sync between NAS and Cloud as needed). A wide variety of Cloud platforms are supported (including the usual Google Drive, DropBox, etc)
Synology Chat – Aimed at businesses, Synology Chat is an IM service that transforms the way users collaborate and communicate. This serves as an alternative to Whatsapp, Skype and more
Synology Drive – Host your own private cloud behind the safety of your NAS with 100% data ownership and no subscription fees. Add to this the local client support for iOS, Android, Windows and Mac for file streaming/pinning so you can natively view the contents of your NAS in your OS file explorer, without taking any local disk space unless you choose to!
Synology Photos – Manage your photos and videos with deep-learning AI that automatically group photos with similar faces, subjects, and places. Also built to help photographers manage their photos and share them with clients for feedback or business development. Recent updates to Synology photos have added new features and improved the sharing/private collection spaces. Additionally, Google TV has also recently added a Synology Photos application.
Synology Calendar – Stay on track, share calendars, and schedule meetings, while ensuring sensitive information remains safely stored on company premises.
Synology Active Backup for Business (ABB) – Consolidate backup tasks for virtualized environments, physical servers, and personal computers, and rapidly restore files, entire machines, or VMs – completely license free.
Synology Hyper Backup – Backup your NAS safely and efficiently to multiple destinations with deduplication, integrity checks, compression, and versioning. This supports a large number of backup tasks that can go on a schedule, support a rotational retention policy, filters, exclusions and more. You can run backups from NAS to NAS, NAS to USB, NAS to Cloud and NAS to Remote NAS. Though for USB routines, it is recommended to look a the USB Copy tool, as this allows your local backup routines to be much better defined and executed.
Synology Virtual Machine Manager (VMM) – An intuitive hypervisor that supports Windows, Linux, and Virtual DSM virtual machines. Its powerful disaster recovery tools help users achieve maximum service uptime.
Synology High Availability – Synology High Availability (SHA) combines two Synology NAS servers into one active-passive high-availability cluster, alleviating service disruptions while mirroring data.
Synology Central Management System (CMS) – Synology CMS allows you to manage multiple Synology NAS servers quickly and conveniently from a single location.
Synology Video Station – Manage all your movies, TV shows, and home videos. Stream them to multiple devices or share them with friends and family. Thanks to the support of Metadata scraping (by connecting a free MovieDatabase account) you can use Video Station to build your own equivalent of a Plex Media Server-presented multimedia collection. Also, there are additional Video station client applications for mobile devices, Amazon Fire TV and more, so you can enjoy your media from your sofa in the best-presented way possible and using native transcoding, as it is a 1st party app.
Synology Audio Station – Manage your music collection, create personal playlists, stream them to your own devices, or share them with family or friends. Additionally, there is a ‘skill’ added to Amazon Alexa that allows you to voice command the music on your NAS to play from your smart speaker.
Synology File Station – Manage your Synology NAS files remotely through web browsers or mobile devices.
You cannot really fault the software and services that are included with the Synology DVA1622 NAS, as you are going to get the very best experience available on the platform, thanks to the hardware and architecture of this NAS. DSM 7 is an ever evolving platform, so if you are reading this now at the time of publishing or years later, there is always going to be something in DSM for everyone.
Synology DVA1622 NAS Review – Conclusion & Verdict
In conclusion, the Synology DVA1622 makes a compelling case for being the best 2-Bay NAS from Synology, despite its price increase over the DS720+ and DS723+. Its ability to run DSM 7.2 on par with its counterparts, while also executing Surveillance Station exceptionally well, sets it apart from the crowd. The added benefits of AI recognition, live AI analysis of recordings, people counting, and intelligent intrusion guidelines are features that can be invaluable to businesses and home users who prioritize their security. Along with these perks, the 8 included surveillance licenses, a significant bump from the 2 that come with other Synology NAS devices, provide excellent value, considering they would cost around $200-250 on their own. The integrated graphics within its CPU offers enhanced multimedia playback capabilities, not only in DSM but also in HEVC recordings in Surveillance Station 9.1. Additionally, the local HDMI/KVM support grants standalone surveillance access, a feature rarely found in other Synology NAS devices. The DVA1622 outclasses the DS720+ by coming with 6GB of memory in its default model, compared to their 2GB. This robust offering, combined with the excellence of Surveillance Station 9.1, one of the world’s best surveillance software, enables the DVA1622 to deliver one of the best experiences of this software.
Access to both DSM and Surveillance Station on the DVA1622 equips you with a full suite of NVR/CCTV services, as well as the backup, syncing, sharing, and security capabilities of DSM 7.2. However, the device isn’t without its limitations. It has only two USB ports, which may limit your flexibility for KVM setup with the HDMI and other USB-dependent tasks. Its single 1GbE port could potentially bottleneck your network, especially when running extensive camera setups and other network-heavy tasks. Additionally, the maximum memory of 6GB could hit a ceiling if you are running several services in DSM 7.2, operating 16 cameras, and managing 2 AI tasks simultaneously, considering the CPU supports up to 8GB. The lack of expandability with the Synology DX517 expansion chassis also limits storage potential, with a 2-Bay NAS typically implying a RAID 1 setup and halving the possible maximum storage. Despite these limitations, the DVA1622 stands as an excellent choice for a 2-Bay NAS. It is highly recommended for both surveillance and standard Synology DSM usage. However, it is essential to remember its lack of local connectivity and scalability when compared to the DS723+, which offers 32GB maximum.
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