I have already escalated this case for few times, but without sucess.
My problem are 2 Windows 2008 servers, 1 Server 2008 STANDARD and 1 SBS 2008.
All except the following is OK:
1st server is 2008 Standard, and is on physical machine, QuadCore XEON, 8 GB RAM, RAID 10 SAS disks, ALL Gigabit NIC's and Gigabit Switches.
100 Mbps optical fibre internet, which runs almost full 100 Mbps in BOTH DIRECTIONS.
MY clients on Gigabit LAN have all interconnection transfer speed between themselves up to 500 or 600 Mbps, except with this SERVER 2008 - only 0.5 - 1 Mbps download speed (from SERVER to CLIENT) max!!!
2nd server is SBS 2008, running on VMware ESXi on same HW as above.
There are 2 virtual machines, one Windows 2003 and one Windows 2008.
Again, problematic is UPLOAD speed from ANY CLIENT to this SBS 2008 - only 2-3 Mbps on Gigabit network.
All other speeds in ANY direction are Gigabit-like.
Also, transfer speeds TO and FROM other virtual machine (win 2003) on same HW are also Gigabit-like
I have tried almost anything on both machines:
- reinstalled NIC drivers
- patched to latest updates
- changed cables
- TEAMED 2 NIC's into team
- played with "autotuninglevel" parameters
But nothing helped!
The common pitfail is: ONLY Win 2008 technology is problematic. And only transfer speed in one direction and one destination is problrmatic (for example - on 1st machine, internet speed is 100 Mbps, but LAN speed is below 1 Mbps).
Here is my paralel post, but there is no usefull advice: http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/Windows_Server_2008/Q_24273725.html
It is NOT that I want to fine-tune. My current LAN speeds are practically useless, so I need to solve those problems asap.