Slow transfer speed between existing servers and new servers

Question

I have an issue with copying files to a new HP physical server with Esxi 5.5 host and Windows 2012 Server from anywhere in our current network.  
We have an older HP server with Esxi 3 and multiple Windows 2003 vms, including a domain controller, file server and sql server (our current environment).   I installed a new HP DL380 Gen 8 server and installed Esxi 5 and two Windows 2012 servers,
one is a DC and one is a file server (our future environment).  
Currently the new 2012 DC a second domain controller; have not made it the first domain controller yet.   The 2012 file server is a member server.  Same network IP range, static, same subnet, same gw.
When I try to copy files from our current environment – to either of the Windows 2012 servers it crawls, like 100kb/sec or less.   It is slow between 2003 and 2012 servers, either direction, and between my Windows 7 and the 2012 server.  Does
not matter if I use windows to copy or robocopy.  It is very fast between the 2003 servers in the current environment and between my windows 7 and the current servers.  Downloads from the Internet do not seem slow.  I have done the following
to try to resolve with no success:
Some forums have suggested disabling Large Send offload on the nic card – usually Broadcom cards, ours are intel, but      I tried it anyway with no success.
Some forums suggested turning off digital signing in group policy, no success.
    Some forums suggest SMB2 can be a culprit, I disabled it on the 2012 server with no change in speed.  
I made sure all the updates are complete on the new 2012 file server.
Turned the server firewall off to be sure it wasn’t blocking something; no antivirus installed yet.
I contacted Vmware to make sure the virtual switch and nics were set up correctly on Esxi 5, they said they are.
I checked the physical Cisco switch settings to make sure it looked fine.   The current and future physical servers were      all connected to the same physical switch.
I switched out the network cable
I moved the network cable to a different switch.
   I checked to be sure DNS was set up correctly.
   I checked firewall settings on the Esxi 5.5.
   Current HP Service pack is installed on the Gen 8 Server.
I am running out ideas.   Any suggestions?

Answer 1

Hi,
Would you like to adjust to RSS, NetDMA and TCP Offload?
http://blogs.technet.com/b/networking/archive/2008/11/14/the-effect-of-tcp-chimney-offload-on-viewing-network-traffic.aspx
Hope this helps.
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