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  • Hyper-V/Windows2008 network issue.

    Hi Folks
    I'm having a strange issue with 1 server which is running hyper-v.
    The setup is we have a hyper v server which is running 2 Guests all are windows 2008 Server, We'll call them S1,S2
    S1 = Acitve Directory
    S2 = Exchange

    S2 is grand however I'm having a network issue with S1 when it comes under a bit of load, I keep getting log entries saying the following.

    Source:srv
    EventID:2012
    Level:Warning
    While transmitting or receiving data, the server encountered a network error. Occassional errors are expected, but large amounts of these indicate a possible error in your network configuration. The error status code is contained within the returned data (formatted as Words) and may point you towards the problem.

    The Physical Hyper V host has two nic's and I've put S1 on nicA and S2 on Nic B problem there on S1 but not on S2, Then I Switched the NIC's round and the same problem S1 logging the error but not S2.
    I have integration services installed on both servers
    Can anyone shed any light on this matter or make suggestions please all help welcome.
    Cheers
    Mark

  • #2
    Re: Hyper-V/Windows2008 network issue.

    The virtual switch on your host connects to external NIC 'A'. External NIC 'B' is either disabled or configured on a different network to remotely manage the host. Virtual servers S1 and S2 connect to the virtual switch.
    Network Engineers do IT under the desk

    Comment


    • #3
      Re: Hyper-V/Windows2008 network issue.

      Originally posted by markmcn View Post
      Hi Folks
      I'm having a strange issue with 1 server which is running hyper-v.
      The setup is we have a hyper v server which is running 2 Guests all are windows 2008 Server, We'll call them S1,S2
      S1 = Acitve Directory
      S2 = Exchange

      S2 is grand however I'm having a network issue with S1 when it comes under a bit of load, I keep getting log entries saying the following.

      Source:srv
      EventID:2012
      Level:Warning
      While transmitting or receiving data, the server encountered a network error. Occassional errors are expected, but large amounts of these indicate a possible error in your network configuration. The error status code is contained within the returned data (formatted as Words) and may point you towards the problem.

      The Physical Hyper V host has two nic's and I've put S1 on nicA and S2 on Nic B problem there on S1 but not on S2, Then I Switched the NIC's round and the same problem S1 logging the error but not S2.
      I have integration services installed on both servers
      Can anyone shed any light on this matter or make suggestions please all help welcome.
      Cheers
      Mark
      When you say that you swapped NICs around, what change did you actually make?

      Comment


      • #4
        Re: Hyper-V/Windows2008 network issue.

        Hi
        What I ment was that I had Server1 using NicA and derver2 using NicB
        then I swapped them so Server1 was using NicB and Server2 was using NicA
        I was trying to rule out the hardware of the ethernet cards.
        I'm thinking it's software related somehow but i'm stuck trying to work out how

        Comment


        • #5
          Re: Hyper-V/Windows2008 network issue.

          I see. So did you swap them via the VM settings, so each one then connects to the other virtual network or by changing the Virtual Network to use the other Physical NIC?

          Comment


          • #6
            Re: Hyper-V/Windows2008 network issue.

            Originally posted by Virtual View Post
            I see. So did you swap them via the VM settings, so each one then connects to the other virtual network or by changing the Virtual Network to use the other Physical NIC?
            Sorry I understand now what your asking I swapped them between virtual networks at the vm guest level and level if this anwers the question, I'm getting really stumpped by this error

            Comment


            • #7
              Re: Hyper-V/Windows2008 network issue.

              Why not manage the host by nic a, and use nic b for both guest machines.
              gerth

              MCITP sa, ea & va, sysadmin@cydonia.

              Comment


              • #8
                Re: Hyper-V/Windows2008 network issue.

                Originally posted by markmcn View Post
                Sorry I understand now what your asking I swapped them between virtual networks at the vm guest level and level if this anwers the question, I'm getting really stumpped by this error
                I see. So what you are saying is that S1's Guest VMs Network Adapter when attached to each Virtual Network has an issue?

                Have you deleted the assigned Network Adapter on the Guest VM and created another?

                Also, are they both using Network Adapters as oppose to Legacy NICs?

                Furthermore, within the Guest VMs, have you compared NIC settings between the two? Jumbo frame settings etc?

                Comment


                • #9
                  Re: Hyper-V/Windows2008 network issue.

                  Have you checked Windows Updates? There was one which claimed it fixed Hyper-V NICs which locked up under load, IIRC.
                  TIA

                  Steven Teiger [SBS-MVP(2003-2009)]
                  http://www.wintra.co.il/
                  sigpic
                  Iím honoured to have been selected for the SMB 150 list for 2013. This is the third time in succession (no logo available for 2011) that I have been honoured with this award.

                  We donít stop playing because we grow old, we grow old because we stop playing.

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