understanding home network speeds

trevor1940
trevor1940 used Ask the Experts™
on
Hi
I'm using Ultracopier to copy some data from Synology NAS to  a LaCie Porsche Design 8TB HDD  connected to USB 3 port on windows 7 PC

NAS & PC are both wired into BT Home hub 5

UltraCopier interface suggests the transfer speed  is between 8.5 upto to about 10 MB/s

Whereas this page review  suggests the Lacie HDD is capable of  192.5MB/s read and 182MB/s write

There is a USB 2.0 port on the  Synology NAS but this is only accessibly via a web interface in the past this has proved unstable for file transfer


My question is why is  UltraCopier saying 10 MB/s but LaCie HDD in theory can write @ 180 MB/s?
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Dr. KlahnPrincipal Software Engineer

Commented:
Lacie HDD is capable of  192.5MB/s read and 182MB/s write

I read that spec as, imo, misleading.  The Lacie drive is probably capable of those speeds ...

  • when it's plugged into an idling system
  • pulling data a high speed drive on a different controller
  • on which USB 3.0 works properly (and many don't)
  • which has been prepared specially for a speed test
  • under the best conditions possible.

But it should be giving better throughput than 10 MB/sec even on USB 2.

I'm going to go out on a limb and say that the USB 3 port is only giving USB 2 throughput, and that the combination of pulling data across a network from a NAS and then shoving it out USB 2 has a bottleneck that is throttling the throughput.

If tested by sourcing data from a local drive connected to the host system's motherboard I think you'll find it performs faster.  How much faster will be the limit for that system in that configuration, and sourcing data from anywhere else will be slower.
Fixer of Problems
Most Valuable Expert 2014
Commented:
10 MBytes/sec is what you get on a 100 Mbits/sec wired network.  You have to have a 1Gbits/sec network to get faster speeds than that.

Author

Commented:
Hi I did a test copy direct fro PC to LaCie and yes it was a lot faster it didn't register with Ultrcopier so it must be the  network slowing down the copying

This page says the BT Hub has four Gigabit ports is that the "100 Mbits/sec wired network" Dave?
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Dr. KlahnPrincipal Software Engineer

Commented:
Good call, Dave.
Dave BaldwinFixer of Problems
Most Valuable Expert 2014

Commented:
No, that page says the newest versions of the BT Hub have Gigabit ports but the previous versions have on Ethernet ports.  The language is messed up but that is trying to say that BT Hub 5 and BT Smart Hub will run at 1Gbits per second (1000Mbits/sec) while the BT Hub 3 and 4 only run at 100Mbits per second.

Author

Commented:
@Dave are you suggesting I should be able to copy data to and from the NAS faster than 10 MB/s  

Going back to basics

1 GB = 1024 MegaBytes

 1Gigabit = 0.125 GigaBytes = 125 MegaBytes.

on a  Gigabit network
So in theory a 1GB file should take 8 seconds

on a  Ethernet network it's 10 time slower

the same 1 GB file would take 80 seconds?


I know I'm simplifying this and not taking into account external factors  like HDD read/wright speeds but is correct?

In which case how do I workout where the bottle neck is?
I have the BT Hub 5!

Author

Commented:
My PC has  a Realtek PCIe GBE Family Controller is this the bottleneck?

LAn.JPG
Dave BaldwinFixer of Problems
Most Valuable Expert 2014

Commented:
Your Realtek NIC is connecting at 100Mbps, Not 1Gbps.  That implies that your BT hub is only running at 100Mbps which would make it the bottle neck.

Author

Commented:
Hi

I  had a chat with BT they claim the Hub cannot restrict traffic but didn't have tools to test speed between wired devices

Ran a test usingLAN speed test (lite) between PC & NAS

1 GB file here is the results dose this look correct if

LanTest.JPG
Dave BaldwinFixer of Problems
Most Valuable Expert 2014

Commented:
Those results mean that at least One of the devices in that connection runs at 100Mbps and Not 1Gbps.

Author

Commented:
Thanx for your help

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