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A combination of a quad core proccessor and a good chunk of memory gives the DS1517+ good Sequential performance which is very consistent across the arrays.
Somehow the benchmark results do not make a lot of sense to me ie looking at the throughput benchmarks most of them hover around 100 MB/sec despite the different RAID set-ups ie one would expect for example a noticeable difference between RAID-0 and RAID-5….
My guess is that you connected the NAS and/or workstation via a standard 1 Gigabit Ethernet to the Network and therefore the LAN became the bottleneck at around 100 MB/sec ie 1 Gigabit …
In a 10 Gigabit LAN with 5 HDs installed I would expect that you should get close to 400 – 500 Megybytes/sec (at least thats my experience with Synology although I am not familiar with this specific model, so there might be otehr bottleneckes in the specific set-up, also 10 Gigabit needs a little bit of tuning until you get good throughput).