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Unable to maximize transfer speed on Synology DS-923+


Just put together the following setup:


- Synology DS-923+, with 32GB RAM and 4x WD Red Plus 10TB each in RAID 0

- Synology 10Gbps ethernet adapter


- TRENDnet 10Gbps Switch


- TRENDnet 10Gbps ethernet card, using Marvell's AQtion chipset

- Brand new CAT6A cabling connecting everything

- Jumbo Frames enabled at 9000 at both Synology and Desktop (Switch is unmanaged)

The WD Red Plus are rated as capable of sustaining 215MB/s. Therefore, 4 in RAID 0 should be able to go 860MB/s, right?

But when I transfer a very large 128GB file from the desktop (NVMe SSD, rated 3000MB/s+) to this RAID 0 volume, I'm only getting 400MB/s, or about only half of what should be expected.

The ethernet ports on both the NAS, Switch and Desktop are all lighting green. They only light green when the connection is at 10Gbps. 5Gbps and below will cause them to light orange.

Any ideas what could be hindering the performance?

Thank you very much !!!
Your setup looks impressive and well thought-out. However, there are some factors to consider when it comes to maximizing transfer speeds. While your calculations regarding RAID 0 performance seem correct on paper, real-world scenarios can vary due to several reasons.

Firstly, it's important to note that advertised speeds, especially for hard drives, are often achieved under ideal conditions and with specific file types. In practice, factors like file size, fragmentation, and the overall system load can affect the achieved speeds. It's quite common to see actual transfer rates fall short of advertised figures.

You might consider setting up iSCSI and performing your transfers through that protocol. This could potentially yield higher speeds, potentially in the range of 500-600MB/s, though it's still unlikely to reach the maximum theoretical 800MB/s due to the inherent limitations of hard drives.

The green lights on your ethernet ports indicate a 10Gbps connection, which is great. However, the performance you experience could also be influenced by the network infrastructure and switch capabilities. The orange light you mentioned generally indicates speeds below 1GbE, but the precise behavior can be switch-dependent.

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