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Data Transfer rate on SBS2008.

Posted on 2010-08-15
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Last Modified: 2012-08-13
This question is in reference to another question i have opened but would like to add in a couple question zones.
http://www.experts-exchange.com/Software/VMWare/Q_26396073.html

The basics of the question is i have a SBS2008 server running on VMware ESXi 4.1 on a windows XP client with a 10/100 NIC i can only download files from the server at around 100Kb/s.  Neither Microsoft or VMware and pinpoint the cause. I am looking for information on what the speeds should be for a SBS2008 and a XP client with a 10/100 NIC.  Please read through all the stuff we have tested and any ideas are welcome to try to figure this out!
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Question by:tsukraw
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Expert Comment

by:vmwarun - Arun
ID: 33443296
It looks like the other VMware Experts already posted several troubleshooting methods to fix this issue.

I took a look at the updates posted on the other question and man-o-man, it seems that this particular thread has been having most of the activity in EE VMware Zone. :)
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Author Comment

by:tsukraw
ID: 33443486
Yes I have gotten many ideas for fixing the issue but non of them seem to work.  Even VMware seen the issue and couldn't give ideas on how to fix it.  They will be calling me back today.  It seems like no one has answers to fix the problem.
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Expert Comment

by:PaperTiger
ID: 33450360
Why not disable those network card and install a different one. See if that solves your problem. Another issue could be your physical switch. You need to verify that is not the problem.

From what I read, it seems to be a hardware issue. I have dealt with something similar before.
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Author Comment

by:tsukraw
ID: 33450388
I have tried a crossover cable between the server and a workstation.  It is a mix of different computer models so I know it is not one specific nic.  And the crossover should rule out the switch.
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Expert Comment

by:PaperTiger
ID: 33450834
what about the NIC on the server?
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Author Comment

by:tsukraw
ID: 33450843
The server has 2 physical nics.  I have tried both of them but i have not tried a different nic all together.
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Expert Comment

by:PaperTiger
ID: 33450872
I would try a different NIC. also it could be the motherboard. It's fairly easy to prove.
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Author Comment

by:tsukraw
ID: 33451041
That is aprt of the reason as to why i was looking for some transfer speeds other people were getting.
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Expert Comment

by:Michael W
ID: 33451407
On the SBS 2008 VM instance, can you post the following output:

netsh interface tcp show global

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Author Comment

by:tsukraw
ID: 33451415
TCP Global Parameters
----------------------------------------------
Receive-Side Scaling State          : enabled
Chimney Offload State               : disabled
Receive Window Auto-Tuning Level    : normal
Add-On Congestion Control Provider  : ctcp
ECN Capability                      : disabled
RFC 1323 Timestamps                 : disabled
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Author Comment

by:tsukraw
ID: 33451487
UPDATE!
Figured out something here!!!
If i put the client machine on Half Duplex the transfer rate is 7MB/s  If it is on Full Duplex it is slow.
I have tried this with a cross over cable from the server to the workstation as well.  Same result so that should rule out the switch as being the cause.  Any idea why this would be?  I know it is a semi simple fix go around to all the client machines and set them to half duplex but there has to be a reason this would happen?
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Expert Comment

by:Michael W
ID: 33451534
The reason I asked for the global interface settings is that under Windows 2003 and also seen under 2008, TCP Offload Engine (TOE) part of the Scalable Networking Pack can at times cause network performance issues.

Try the following configuration and see if this helps any:

netsh interface tcp set global chimney=disabled
netsh interface tcp set global rss=disabled

Reference:
http://support.microsoft.com/kb/951037
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Author Comment

by:tsukraw
ID: 33451549
Got the same results with both them disabled.
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Expert Comment

by:PaperTiger
ID: 33451550
Your NIC is the problem. Try a separate PCI NIC card.
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Author Comment

by:tsukraw
ID: 33451554
I have 10 computers of different types.  Plus my personal HP Elitebook laptop all get the same results with Half vs Full.  So i couldnt believe the NIC is the issue...
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Expert Comment

by:PaperTiger
ID: 33451561
I meant your server's NIC card was faulty. Install a separate PCI card, set your virtual machine to use that card and see if the problem exists.
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Author Comment

by:tsukraw
ID: 33451575
I have another server in my test lab with ESXI 4.1 and SBS2008.  It is a HP ML150G6.  So i has a completely different NIC and motherboard.  I got the same results.  In my test setup i have a simple un-managed GB switch.  I never noticed this in my test setup since everything is GB.  But if i set a computer to 10/100FULL in the test lab it get the same slow speed 100/HALF i get fast speed.  So would that lead to believe there is some issue with wither ESXi or SBS2008?  Since 2 completely different setups and hardware have the same identical issue?
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Expert Comment

by:Michael W
ID: 33451588
Are you using a physical NIC card or the on-board motherboard one? If physical NIC, what model/brand is it?

Also, do you have the latest VMware tools installed on the SBS 2008 platform?
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Author Comment

by:tsukraw
ID: 33451595
In both cases i am using the onboard NICs.  The NON lab server has dual nics onboard and i have tested with both.  

Also has the newest VMware tools installed.
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Author Comment

by:tsukraw
ID: 33451609
I am not sure if i mentioned this before.  I loaded a 2003 standard server on the same ESXi host.  The 2003 standard did NOT have a transfer issue with the windows XP machine.  It is only the SBS 2008 that has the speed issue.
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Expert Comment

by:Michael W
ID: 33451613
The only thing I can think of is that: 1) The switch has a bad port (or two); 2) Bad firmware for the NICs is causing communication issues; 3) The onboard/motherboard NICs are not on the VMware HCL list

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Author Comment

by:tsukraw
ID: 33451627
The nic is on the HCL.
There has to be a better explanation then something faulty if i have 2 completely different locations having the exactly same issue with completely different hardware.
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Expert Comment

by:Michael W
ID: 33451659
Just curious, but do you still have the same issues if you don't virtualize the SBS 2008 environment (i.e. installing SBS 2008 on the hardware instead)?
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Author Comment

by:tsukraw
ID: 33451667
Yes.  I just checked another setup i have where the SBS is installed on just hardware no VM.. All there computers are gig nics so never noticed it.  But if i manually set one to 100/FULL same issue.  100/HALF works just fine.  They have a 8port un-mannaged Gbit switch.
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Author Comment

by:tsukraw
ID: 33451681
I also have a SBS2008 running on Citrix XenServer 5.6 same results.  Slow on 100/FULL fast on 100/HALF
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Expert Comment

by:Michael W
ID: 33451704
Is any anti-virus installed on the SBS 2008 environment or are these base OS installs?
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Author Comment

by:tsukraw
ID: 33451711
No AV on any of them
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Expert Comment

by:Michael W
ID: 33451720
Also can you ssh to the ESXi host and run the following command:

vicfg-nics -l

Reference:
http://www.vmware.com/support/developer/vcli/vcli41/doc/reference/vicfg-nics.html
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Accepted Solution

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tsukraw earned 0 total points
ID: 33614837
Ended up setting all the computers to either 100/HALF or replaced the nics with Gbit NICs.
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