I ran some tests on our gigabit network.
When I transfer a big file (10GB) from a windows 7 computer to another, the troughtput never exceed 50Mb (it start at 80MB/s for one second then slows down to 32MB/s).
Using simultaneous transfers from several computers, the client can maxout its Gb connection. Idem, when using several clients at the same time, the source computer reach near Gb troughput.
The tests were done on very fast drives (2 velociraptor in Raid 0, 4 WD red on LSI megaraid RAID5, SSD, Revodrive X3...). So they are not the bottleneck.
When I transfer from a windows server, the troughput is slightly better but far from the expected 112MB/s of a gibit LAN.
Any idea ?
Edit after strange walker comment : We are using integrated NIC (intel) on ASUS motherboards and DELL Workstation. Switches are Manageable Cisco SG 300-20, SF 300-08 and Netgear GS 108.