Performance - more
The composite NAS Ranker chart below was filtered for RAID 1 and Revision 5 testing and sorted by descending price. The DS716+ at $450 is a relative bargain vs. the ASUSTOR AS6202T, which uses the same processor. But the Synology significantly trails the ASUSTOR in rank at #10 vs. #5. The top-ranked ASUSTOR AS5102T is a relative bargain at $428.
RAID 1 NAS Rank - Descending price sort
The chart below shows the individual and category scores for the same three NASes used in the benchmark summary above. The Synology DS716+ didn't win any of test categories and ended up with a #10 Total NAS ranking. With two NASes tied for #5, that's effective eleventh out of 17 NASes. Its best showing was a tie for #7 with the ASUSTOR AS6202T for iSCSI performance..
Ranker Performance Summary comparison
With a street price of about $450, the Synology DS716+ is one of the most expensive two-bay NASes you can purchase. The only models that cost more are the #1 ranked $468 ASUSTOR 5102T (included for comparison in this review), the #16 ranked $470 Seagate STCT8000100 NAS and the #5 ranked $563 ASUSTOR AS6202T (also included for comparison in this review). Note: the pricing on the ASUSTOR AS5102T seems to be bouncing around a little bit. Earlier last week, it was selling for $438 making it both the top ranked two-bay NAS as well as cheaper than the DS716+.
From a performance perspective, the DS716+ was a disappointment. Relatively low RAID 1 performance for File Copy Read and Write tests as well as slower backup hurt the overall Total NAS ranking. If you sort the NAS ranker by price, you notice that there are nine NASes with a better (lower) Total NAS score that are also cheaper than the DS716+ including the #3 ranked Synology DS216.
The DS716+ is expandable to seven bays with the addition of the DX513, but the expansion chassis, currently at $526, is pretty expensive. The DS716+ does support the Btrfs filesystem that provides added fault tolerance and nearly instantaneous data snapshots. But looking at some of the performance differences between Btfrs and EXT4, I'd have to weigh the impact on actual use before I'd trade performance for additional fault tolerance. Perhaps Synology will address some of the performance issues noted in this review and bring the DS716+ in line with the performance with the ASUSTOR NASes with a future firmware update.
For now, the ASUSTOR AS5102T keeps its #1 ranking based on performance, and the $299 Western Digital My Cloud Gen 2 (with two TB disks included) remains the best overall storage value for a two-bay NAS.