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2012 R2 Hyper-V Multiple Virtual Machines Startup Problem

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  • 2012 R2 Hyper-V Multiple Virtual Machines Startup Problem

    Hi,

    Before I explain my problems I would like give you a high level overview of our server configuration:

    Processors: Intel Xeon CPU E5-2620 2.00 GHz (x2) - 12 Cores
    RAM: 88GB
    Host OS: Windows Server 2012 R2 Standard
    Network Adapter # 1 IP: 192.168.10.11 (dedicated to host OS)
    Network Adapter # 2 IP: 192.168.10.12 (dedicated for Hyper-V as Virtual
    Switch)

    Hyper-V Settings:
    NUMA Spanning: Allow
    Enhanced Session Mode Policy (Server & User): Unchecked

    On this machine, we have added Hyper-V role and installed 2 guest servers for SAP installation.

    Hyper-V Guest OS 1 (EADSERV): Windows Server 2012 R2 Standard. Installed SAP ECC 6.0 using Sybase ASE 15.7 RDBMS

    Hyper-V Guest OS 2 (EAPSERV): Windows Server 2012 R2 Standard. Installed SAP ECC 6.0 using Sybase ASE 15.7 RDBMS.

    Both Guest VM Hyper-V Settings:
    Memory: 20GB
    Dynamic Memory: Disabled
    Memory Weight: High
    Processor: 2 Virtual processors
    VM Virutal Processor reserve (percentage): 100
    Network Adapter: Virtual switch from Network Adapter # 2

    Now, when I start either one of two Guest VM and start SAP services then everything seems to work fine. But if I turn on another Guest VM and start SAP services then both systems SAP services would go down by loosing internal database connection. The sequence doesn't matter.

    I was wondering if there is any Windows Server 2012 R2 Hyper-V setting that might cause this? Shouldn't each VM work independently without impacting other VM's?

    Appreciate your help on this.

    Many Thanks!

  • #2
    Re: 2012 R2 Hyper-V Multiple Virtual Machines Startup Problem

    The only things I can think of in HyperV are that both VMs have the same MAC address for their virtual network, or possibly that you cloned a VM and the other one has the same SID

    However, I would also start looking from the SAP end and see if they have met the same issue
    Tom Jones
    MCT, MCSE (2000:Security & 2003), MCSA:Security & Messaging, MCDBA, MCDST, MCITP(EA, EMA, SA, EDA, ES, CS), MCTS, MCP, Sec+
    PhD, MSc, FIAP, MIITT
    IT Trainer / Consultant
    Ossian Ltd
    Scotland

    ** Remember to give credit where credit is due and leave reputation points where appropriate **

    Comment


    • #3
      Re: 2012 R2 Hyper-V Multiple Virtual Machines Startup Problem

      Thanks for your reply. I did check the MAC addresses and these two VMs were not cloned and neither they have same SID

      I have already opened a message with SAP support however I wasn't sure if I missed something within Hyper-V.

      Comment


      • #4
        Re: 2012 R2 Hyper-V Multiple Virtual Machines Startup Problem

        Just a thought- could it be that since my VM's are using same Virtual Switch spawned from one single network adapter have internal port conflicts

        Comment


        • #5
          Re: 2012 R2 Hyper-V Multiple Virtual Machines Startup Problem

          You have said they have different IP addresses?
          As I said before, I wondered about MAC address conflicts but you have ruled that out?
          Tom Jones
          MCT, MCSE (2000:Security & 2003), MCSA:Security & Messaging, MCDBA, MCDST, MCITP(EA, EMA, SA, EDA, ES, CS), MCTS, MCP, Sec+
          PhD, MSc, FIAP, MIITT
          IT Trainer / Consultant
          Ossian Ltd
          Scotland

          ** Remember to give credit where credit is due and leave reputation points where appropriate **

          Comment


          • #6
            Re: 2012 R2 Hyper-V Multiple Virtual Machines Startup Problem

            Yes, separate MAC addresses and static IP address assignment.

            Comment


            • #7
              Re: 2012 R2 Hyper-V Multiple Virtual Machines Startup Problem

              My problem got fixed and below link helped me resolve it:

              http://nbevans.wordpress.com/2011/03...nection-to-vm/

              I had disabled IPv6 thinking that we were only using IPv4 however seems like this must be enabled for the services to work.

              Comment


              • #8
                Re: 2012 R2 Hyper-V Multiple Virtual Machines Startup Problem

                Did you give IPv6 a Static address or leave it for DHCP to handle?
                1 1 was a racehorse.
                2 2 was 1 2.
                1 1 1 1 race 1 day,
                2 2 1 1 2

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                • #9
                  Re: 2012 R2 Hyper-V Multiple Virtual Machines Startup Problem

                  I left it for DHCP to handle. Our router is configured to issue IPv4 addresses only.

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