Synology 5 Bay Expansion Unit DX517 Diskless - Enclosure

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Muito fácil de instalar e uma ótima solução para expandir o sistema NAS da Synology.

Boa escolha. É a nossa segunda NAS Synology. Altamente recomendável.

I already have another Synology Diskstation, but I quickly filled it up. After quite a bit of research, I found this expansion case, purchased it, along with four new 16 TB drives. I decided to leave the fifth bay empty for now. I plugged this expansion into my other diskstation, added the physical drives, then using the Synology user interface, added the four new physical drives to the logical unit, which was already running RAID 6. Since I was doubling the number of drives on an existing RAID, it took many many hours to rebuild the RAID, but it was certainly worth it in the long run.

As others have said, you are paying a premium for a a single bus eSATA expansion that fits certain Synology NAS boxes. It works well, and the causes no issues with any of the Synology DSM software. That is a huge plus. Everything else is either neutral or a minus. First, you are limited to the bandwidth of a single eSATA bus per expansion box. That means your maximum transfer rate is about 600 megabytes per second period. If you are dealing with small files, or lots of random access, the speed is even slower. If you want to speed things up, you need to add cache drives to the bays of the expansion unit. Synology allows you to share the NVMe cache in the parent NAS, but you risk a RAID crash if you lose your data connection or have a bad shutdown. If you choose to use bays for your cache you are limited to 4 expansion bays and one read only cache or 3 expansion bays and a read / write cache. Once again, you are still limited to the bus speed, but SSD SATA cache drives are faster than traditional drives. You will speed up file transfers by 15%+ with SSD read / write cache. Second, you are paying a fair amount for what is really nothing more than a branded eSATA RAID box. It is nice that out of the box, it works, but it is rather expensive for what it is. Finally, it is nice that the NAS you plug this into controls the expansion just like your NAS. It is really easy to maintain, expand and every other function your RAID. That is the best reason to purchase an expansion versus adding a non-branded eSATA or USB solution to your NAS. Do I recommend this if you need to expand your storage and speed isn't a premium? Yes I do.