Problem in Mounting the VHD drive

Question

Hi all,

Please help me. I am writing following code to mount the vhd file. But I am not able to mount it. It works fine locally but when I deploy it on azure server the webrole remains offline. I tried by removing foreach block below but in vain. But when I removed the code "Global.driveLetter = drive.Mount(localCache.MaximumSizeInMegabytes - 20, DriveMountOptions.Force);" with foreach block, role got ready on server. But I can't do this because this is the key statement to mount the drive.

I am uploading my VHD using "Cloud Storage Studio".

What would be the problem?

private static void MountAzureDrive()
{
    string connectionStringSettingName = "AzureConnectionString";
    string azureDriveContainerName = "azuredrives";
    string azureDrivePageBlobName = Guid.NewGuid().ToString("N").ToLowerInvariant();
    string azureDriveCacheDirName = Path.Combine(Environment.CurrentDirectory, "cache");

    CloudStorageAccount.SetConfigurationSettingPublisher((a, b) =>
    {
        b(RoleEnvironment.GetConfigurationSettingValue(connectionStringSettingName));
    });

    //CloudStorageAccount storageAccount=CloudStorageAccount.FromConfigurationSetting(connectionStringSettingName);

    LocalResource localCache=RoleEnvironment.GetLocalResource("InstanceDriveCache");
    CloudDrive.InitializeCache(localCache.RootPath + "cache", localCache.MaximumSizeInMegabytes);

    // Just checking: make sure the container exists
    CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
    blobClient.GetContainerReference("drives").CreateIfNotExist();

    // Create cloud drive
 //WebRole.drive=storageAccount.CreateCloudDrive(blobClient.GetContainerReference("drives").GetPageBlobReference("Test.VHD").Uri.ToString());
    WebRole.drive = storageAccount.CreateCloudDrive("drives/Test.VHD");

    try
    {
        WebRole.drive.CreateIfNotExist(512);
    }
    catch (CloudDriveException ex)
    {
        // handle exception here
        // exception is also thrown if all is well but the drive already exists
    }

    foreach (var d in CloudDrive.GetMountedDrives())
    {
        //var mountedDrive = storageAccount.CreateCloudDrive(d.Value.PathAndQuery);
        mountedDrive.Unmount();
    }
    //Global.driveLetter = drive.Mount(25, DriveMountOptions.Force);
    Global.driveLetter = drive.Mount(localCache.MaximumSizeInMegabytes - 20, DriveMountOptions.Force);
}

Thanks in advance.

Answer 1

Hi,

According to your description, you have mounted the Drive in local, do you ever umount it before running on the cloud? As far as i know, every drive can only mount once (Access write), so please make sure it was unmounted before running.

Hope it can help you.

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Answer 2

I have written code in onstop event to unmount the drive. Also for local I am using

storageAccount=CloudStorageAccount.DevelopmentStorageAccount;

For server I am using the code 

storageAccount=CloudStorageAccount.FromConfigurationSetting(connectionStringSettingName);

So there will not be any problem which you mentioned in the post.

Yes, I am unmounting the VHD drive in onstop event of webrole

Answer 3

Hi,

It seems a strange problem, please try to open Trace to see more details about your exception and post here.

Thank you.

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Please mark the replies as answers if they help or unmark if not. If you have any feedback about my replies, please contact [e-mail] Microsoft One Code Framework

Answer 4

Hi - was this ever resolved?  let us know if you still need help with this issue.

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-Jeff