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3.2.4.4.1.38 IVolumeClient::ImportDiskGroup (Opnum 43)

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The ImportDiskGroup method imports a foreign dynamic disk group as the primary disk group of the server. This is an asynchronous task.

 HRESULT ImportDiskGroup(
   [in] int cchDgid,
   [in, size_is(cchDgid)] byte* dgid,
   [out] TASK_INFO* tinfo
 );

cchDgid: Size of dgid in characters, including the terminating null character.

dgid: Null-terminated string that contains the UUID of the disk group to import. This parameter is generated by converting a GUID to a null-terminated ASCII string, and then treating the resulting string as a byte array.

tinfo: Pointer to a TASK_INFO structure that the client can use to track the request's progress.

Return Values: The method MUST return 0 or a nonerror HRESULT on success, or an implementation-specific nonzero error code on failure (as specified in [MS-ERREF]; see also section 2.2.1 for HRESULT values predefined by the Disk Management Remote Protocol).

Upon receiving this message, the server MUST validate parameters:

  1. Verify that dgid is a valid disk group ID that belongs to a foreign dynamic disk group.

  2. Verify that tinfo is not NULL.

If parameter validation fails, the server MUST fail the operation immediately, returning an appropriate error as its response to the client.

Otherwise, the server MUST process the message as follows:

  1. Make the foreign disk group specified by dgid the primary disk group of the system.

  2. Wait for the operation to either succeed or fail.

  3. Fill in the tinfo output parameter.

    TASK_INFO member

    Required for this operation

    TASK_INFO::id

    Required.

    TASK_INFO::storageId

    Not required.

    TASK_INFO::createTime

    Not required.<142>

    TASK_INFO::clientID

    Not required.<143>

    TASK_INFO::percentComplete

    Required for any task that returns REQ_IN_PROGRESS.

    TASK_INFO::status

    Required.

    TASK_INFO::type

    Required if PercentageComplete is being used.

    TASK_INFO::error

    Required.

    TASK_INFO::tflag

    Not required.<144>

  4. Return a response to the client that contains tinfo and the status of the operation.

  5. Send the task completion notification.

Note The server MAY decide not to wait for the disk import operation to complete before returning the response to the client. This task is asynchronous and all rules for handling asynchronous tasks apply here.<145>

If the operation is successful, the server MUST make the following changes to the list of storage objects before returning the response:

  1. Modify the disk objects of the disk group to account for the change in status.

  2.  Create new dynamic volume objects that correspond to the imported volumes.

  3. Create new disk region objects that correspond to the imported volumes.

  4. Modify drive letter objects to mark them as in use by the imported volumes (if the volumes have drive letters).

  5. Create file system objects for the imported volumes (if the volumes are formatted with file systems).