Can't find the bottleneck for slow data transfer rates

moopoints

Commendable
Jul 6, 2016
2
0
1,510
Hi there,

I have a setup at home with a Qnap TS-251 as a NAS and am experiencing slow transfer rates (and almost no Internet connectivity while I'm transferring data to the NAS).

This is my current setup:

  • Eero Wifi system with 3 wifi routers
    Eero is connected to a Zyxel powerline adapter serving as a sender
    Qnap TS 251 NAS connected via Ethernet directly to main router
    Qnap NAS includes 2x 4TB Western Digital Red HDDs set up as Raid
    Windows PC, in another room connected via Ethernet (via Zyxel powerline adapter)
    Macbook Pro, connected wireless

Speeds I usually get:

  • Macbook Pro Internet speed test usually around 50-100 Mbps, depending on location
    Windows PC Internet speed test usually around 25-50 Mbps
    Data transfer from Windows PC to NAS at max 5 MB/s

I have two problems with this: 1) the data transfer to the NAS being at 5 MB/s seems very slow to me. The Qnap should easily have write speeds of up to 100 MB/s. Problem 2) is that once I start the data transfer from my Windows machine to the NAS I have literally no Internet access (Internet speed tests then show 200-400 KB/s) for as long as I am copying data to the NAS.

What's my bottleneck? Is it the powerline connection? Shouldn't I be able to transfer data at 5 MB/s and still have plenty of room to have full speed Internet access? Do I have wrong Ethernet settings? What am I missing?

Any hints are much appreciated! Thanks!!
 
Solution


well then your speed is about all your going to get unless you upgrade to gigabit wired. 100mbs is going to limite you performance even though your wireless speed is much faster it has to slow down to the wired connection speed when sending data to it.
Hard to tell your issue.

Are you running on 2.4 or 5ghz wifi?
Are you running 10, 100, or 1000 connection on your wired network?

100mb wired network supports at most 12MB/S and that's before overhead so that is never achivable. 5MB/s sounds like your using a 100mbs wired network
 

moopoints

Commendable
Jul 6, 2016
2
0
1,510


The wifi is a 5Ghz network.
The Ethernet should be a 100mbs network, not sure actually. Is that purely defined by the ethernet cables? What else plays a role?


 


well then your speed is about all your going to get unless you upgrade to gigabit wired. 100mbs is going to limite you performance even though your wireless speed is much faster it has to slow down to the wired connection speed when sending data to it.
 
Solution