Hi,
I have 2 computers both with a mellanox ConnectX-2 Card and Windows 8.1.1 x64 updated. I use OFED 4.95 driver and I have the latest firmware for both cards. I use arista transceivers of 10GB.
Computer A:
AMD FX-8350 with 8GB of RAM and PCI-E x16. 4 HHD in RAID0 with a 680MB/s of sequential speed of read and write (Hitachi Deskstar 7K4000).
Computer B:
Intel G1840 with 2GB of RAM and PCI-E x16. 4 HHD in RAID0 with a 550MB/s of sequential speed of read and write (WD Green).
I share one folder in computer A and one folder in computer B. The folder are in RAID0 volume, obviously. The windows system is in another hard-drive, not in the RAID0.
My problem is:
When I copy one file of computer B to computer A I get 530MB/s of transfer-rate. This is right.
But When I copy one file of computer A to computer B I get only 270MB/s of transfer-rate. This is wrong. Why not 500MB/s at least?
I don't understand! Is it a problem of the computer hardware? or is it a problem of configuration mellanox card?
I tried the same in another Computer C:
Computer C:
AMD Kabini A4-5000 with 8GB of RAM and PCI-E x4. SSD with 550MB/s of sequential speed of read and write (Samsung 850EVO 500GB)
So:
When I copy one file of computer C to computer A I get 530MB/s of transfer-rate. This is right.
But When I copy one file of computer A to computer C I get only 120MB/s of transfer-rate. This is wrong. Why not 500MB/s at least?
I can't try it with Computer B and C. Now I don't have the Computer C. I have changed the Kabini computer for an intel computer only for this problem
Any solution for this? my head is burning haha!!
Thank you masters!!