For standard rack-based systems this unit offers good performance and versatility. It has a 1U rack form factor so it can fit into most standard rack enclosures. The RS815+ holds a total of four hard disks and can be expanded with four more more via an expansion unit. With the RS815+, you can transcode multiple streams of full HD video, run up to 40 IP surveillance cameras simultaneously or provide no-lag file transfer to large workgroups.
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Pros
Pro Encrypts data with little impact to performance
This unit utilizes the new AES-NI encryption engine, which is much faster and more efficient than the standard AES-256 used by most NAS units. This means you can work more with encrypted data without suffering performance drops from a heavy CPU load.
Pro Good computational power for virtually all use cases
Great computational power allows this unit to be usable within pretty much any environment. It can handle multiple-stream transcoding, large scale file handling, or multiple stream surveillance data storage. Whatever the use case, this unit will most likely have you covered.
Pro Expandable storage and memory
The expansion unit comes with four HDD bays and can add 40TB more to your total storage. While the NAS comes with 2GB of RAM by default, there’s an extra RAM chip slot so you can upgrade its memory to up to 6GB.
Pro Wide range of apps to be used with this unit
Like other Synology devices, this NAS has access to a wide array of apps such as cloud service, surveillance applications, file download and file transfer applications.
Cons
Con Expensive
This unit might hit your pocket hard. As with most brands, this Synology rack unit is pricier than its tower counterpart, and its use is much more limited.