Speed issue between two my cloud drives

My Cloud OS 3 Personal & Network Attached Storage My Cloud
1

hi All.
I have two wd my cloud drives. They are on a gigabit wired connection on the same switch, within the same lan. Using brand new lan cables.
Running fw4.x

Between my Pc and wd drives I get sustained data transfer rates of about 75-80MB/s using samba mapped drive.
However data transfer between the two drives I.e copy paste a large file between the two mapped drives using my pic, I only get 50MB/s. Even that speed is not sustained and the transfer speed HEAVILY fluctuates up and down between 30-50MB/ sec.
Is it because of some tcp issues? I have tried using different pc, different router, switch,cables and get the same results.

2

If I had to guess, I’d say your PC is CPU-bound.

3

Doubt it, The PC is an intel i7 3.4GHZ, 16gb of ram. There is no cpu usage on the pc while copying data between the two wd drives.

4

The copy must be going via the PC, i.e. MC1-router-PC-router-MC2

So you have twice the traffic on your PC’s LAN port, so the transfer rate is about half the one-way rate.

5

cpt_paranoia wrote:

The copy must be going via the PC, i.e. MC1-router-PC-router-MC2

 

So you have twice the traffic on your PC’s LAN port, so the transfer rate is about half the one-way rate.

Yes it does go through the PC lan card for sure. So i guess your explanation does make some sense.