Question How to read data from Hyper-V?

[raysefo]

Hello there,

I would like to get RAM, CPU, and disk data from Hyper-V, is there any tutorial that I can follow? I have no experience with virtualization or servers. Basically, let's say there are 10 Hyper-Vs. I would like to do is, retrieve RAM, CPU, and disk data of them in my console application using WMI. Any help would be appreciated.

Thank you.

 

[Skydiver]

See:

Hyper-V WMI provider (V2) - Win32 apps

Microsoft Hyper-V server provides a scalable, reliable, and highly available virtual machine management environment. Hyper-V virtual machine software consolidates servers and development and testing environments.

learn.microsoft.com

You'll want to query the memory, CPU, and disk class objects.

 

[raysefo]

Thank you @Skydiver, I did a little research and came across a code like this. Can we somehow find all vms instead of sending vmNames as a parameter? Do you have an idea?

public class GetSummaryInformationClassV2
{
    public static void GetSummaryInformation(string[] vmNames)
    {
        ManagementScope scope = new ManagementScope(@"root\virtualization\v2", null);
        ManagementObject virtualSystemService = Utility.GetServiceObject(scope, "Msvm_VirtualSystemManagementService");
        ManagementBaseObject inParams = virtualSystemService.GetMethodParameters("GetSummaryInformation");

        ManagementObject[] virtualSystemSettings = new ManagementObject[vmNames.Length];

        for (int i = 0; i < vmNames.Length; i++)
        {
            virtualSystemSettings[i] = GetVirtualSystemSetting(vmNames[i], scope);
        }

        UInt32[] requestedInformation = new UInt32[4];
        requestedInformation[0] = 1;    // ElementName
        requestedInformation[2] = 103;  // MemoryUsage
        requestedInformation[3] = 112;  // MemoryAvailable

        inParams["SettingData"] = virtualSystemSettings;
        inParams["RequestedInformation"] = requestedInformation;

        ManagementBaseObject outParams = virtualSystemService.InvokeMethod("GetSummaryInformation", inParams, null);

        if ((UInt32)outParams["ReturnValue"] == ReturnCode.Completed)
        {
            Console.WriteLine("Summary information was retrieved successfully.");

            ManagementBaseObject[] summaryInformationArray =
                (ManagementBaseObject[])outParams["SummaryInformation"];

            foreach (ManagementBaseObject summaryInformation in summaryInformationArray)
            {
                Console.WriteLine("\nVirtual System Summary Information:");
                if ((null == summaryInformation["Name"]) ||
                    (summaryInformation["Name"].ToString().Length == 0))
                {
                    Console.WriteLine("\tThe VM or snapshot could not be found.");
                }
                else
                {
                    Console.WriteLine("\tName: {0}", summaryInformation["Name"].ToString());
                    foreach (UInt32 requested in requestedInformation)
                    {
                        switch (requested)
                        {
                            case 1:
                                Console.WriteLine("\tElementName: {0}", summaryInformation["ElementName"].ToString());
                                break;

                            case 103:
                                Console.WriteLine("\tMemoryUsage: {0}", summaryInformation["MemoryUsage"].ToString());
                                break;

                            case 112:
                                Console.WriteLine("\tMemoryAvailable: {0}", summaryInformation["MemoryAvailable"].ToString());
                                break;
                        }
                    }
                }
            }
        }
        else
        {
            Console.WriteLine("Failed to retrieve virtual system summary information");
        }

        inParams.Dispose();
        outParams.Dispose();
        virtualSystemService.Dispose();
    }

    public static ManagementObject GetVirtualSystemSetting(string vmName, ManagementScope scope)
    {
        ManagementObject virtualSystem = Utility.GetTargetComputer(vmName, scope);

        ManagementObjectCollection virtualSystemSettings = virtualSystem.GetRelated
         (
             "Msvm_VirtualSystemSettingData",
             "Msvm_SettingsDefineState",
             null,
             null,
             "SettingData",
             "ManagedElement",
             false,
             null
         );

        ManagementObject virtualSystemSetting = null;

        foreach (ManagementObject instance in virtualSystemSettings)
        {
            virtualSystemSetting = instance;
            break;
        }

        return virtualSystemSetting;

    }
}

 

[Skydiver]

I think you would enumerate all of the Msvm_ComputerSystem. I am not familiar enough with WMI on how to do that.