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Very slow network connections to Hyper-V child partitions resp. virtual machines RRS feed

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    Dear all.

    We have a Hyper-V network problem. But first of all I will describe our Server Infrastructure.

    We have installed 2 Hyper-V Host machines: Both are DELL Poweredge 2950 with 32GB RAM and two Quad Core CPU's from Intel. Furthermore we have all in all 6 INTEL PRO 1000 server adapter in each machine. And we do not use teaming. To this we are using a RAID 5 with more than 6 harddisc members (SAS 15k). So the harddiscs are quiet fast.

    On the physical hosts we manage our networkcards in this way:

    1) on each physical Host one physical adapter is exclusive only for the Host machines. So we have activated the following services/protocols:

    Name: Management LAN
       Client for Microsoft Networks
       File and Printer Sharing for Microsoft Networks
       TCP/IPv4
       Link Layer Topology Discovery Mapper I/O Driver
       Link Layer Topology Discovery Responder


    2) on each physical Host we have 5 additional physical adpaters.

    Name: physical LAN
    - the 5 physical adapters have the following services/protocols activated:
       Microsoft Virtual Network Swith Protocol

    Name: virtual LAN
    - we created 5 virtual adapters from the 5 physical adapters so that every virtual machine has its own LAN adapter. The virtual adapters have the following services/protocols activated:
       no protocaol activated

    So there is only one LAN adapter per physical host with an IP. All other 5 adapters don't have an IP.

    _________________________________________________________________________________________________________________________

    On the virtual hosts/clients we manage our networkcards in this way:

    Name: Local Area Connectioon (standard name)
    - the virtual adapter in the virtual machine has the following services/protocols activated:
       Client for Microsoft Networks
       File and Printer Sharing for Microsoft Networks
       TCP/IPv4
       Link Layer Topology Discovery Mapper I/O Driver
       Link Layer Topology Discovery Responder

    _________________________________________________________________________________________________________________________

    On all machines we have installed Windows Server 2008 SP2 64bit with all official updates.

    But now the problem:

    While copying large or small files from a virtual machine to another virtual machine we have only an adapter usage from approx 200mBit/s.
    While copying large or small files from a virtual machine to a physical host we have only an adapter usage from approx 200mBit/s.
    While copying large or small files from a physical host to another physical host we have an adapter usage from approx 1GBit/s.

    Why is the copyprocess between virtual hosts resp. virtual hosts and physical hosts. so slow? It is only 20% of the "real" adapter bandwith. Is it a configuration issue? Or is there a missing unofficial patch?

    Thanks for your help in advanced.

    Reagards

    FernandeZ

    Montag, 28. September 2009 12:49
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    Hello Franandez,

    if you are native english, there are english Hyper-V Forums as well: http://social.technet.microsoft.com/Forums/en-US/winserverhyperv/threads, this is a German Forum.

    BTW: Have you created "legacy" Network Adapters? If yes, change them that you use synthetic devices. This may be the bottleneck within your system.
    Peter Forster, MVP Virtual Machine, Austria
    Montag, 28. September 2009 13:50
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    No, we have used no legacy adapters. And yes, I have installed the Integration components...

    Ähhm to the english/german issue. I have visited the englisch Hyper-V Forum and when I clicked Ask a new question I only got german Forums as choise to post in?!? Why?!? Don't ask me... So I posted the english thread in the german and in the english florum also... Sorry for that.
    Montag, 28. September 2009 13:56
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    So, ich denke das Problem liegt eventuell bei den CPU's. Diese sind eventuell zu langsam... siehe englischer Text unterhalb.


    So I think it could be a problem concerning to the CPU and its usage while copying over the network... This copyprocess costs CPU power. We are using 2 Quadcore CPU's in each physical hostmachine.

    First machine includes: Intel XEON E5440 @2,83GHz
    Second machine includes: Intel XEON E5320 @1,86GHz

    This could be the problem... The E5320 is to slow.

    What do you think? How many virtual CPU's should be given to the virtual machines if you have a 2x Quadcore machine.

    Mittwoch, 7. Oktober 2009 12:15
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