Introduction to the MVL Driver

Mantech Volume Lock (MVL) is a kernel drive which provides the function of managing the shared disk for Windows OS.
MVL locks access to the shared disk resource. You cannot access the volume of shared disk before it unlocks access. Only a node allow to access to the shared disk resource.
MVL can be managed in volume unit and partition unit of Window but it is not recommended. But it is recommended to use volume unit management.
It supports both GPT disk and MBR disk, and for file system, it supports NTFS only.

MVL Installation and Removal

MVL can enable load / unload driver and activate without the need to reboot the system after installation. MVL is automatically installed in the last step of the installation of MCCS.
MVL driver can be installed/unistalled manually through the command of, 'install.bat /uninstall.bat' of the '%MCCS_HOME%\bin\DiskAgent' directory.
MVS is developed in a way of legacy filter driver of Wiindows.
Therefore, service start and stop can be done through net command of Windows.
Following is the way of service start and stop using command line interface.

Start

net start vollock

Stop

net stop vollock

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Example of Shared Disk Configuration

Following steps are recommended to manage shared disk resource through MVL after installing MCCS.

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There are two way to add a resource which one is select this from a group name and another is select this from a resource type.

Adding in Group

1. When add a resource from a group name, select a group -> right click -> 'Add Resource'. Or select Edit(E) from the main menu bar -> select 'Add Resource'. Or select 'Add Resource' icon from the tool bar.
    
   [Figure] Adding Resource in a group
   
   

2. Select 'SharedDisk' from Resource Type lists and click 'Next' button. When add a resource from the shared disk resource type name, this step will be skipped.
   
   [Figure] Select Resource Wizard View

   
   

3. Next steps are same as adding in resource type.

Adding in Resource Type

1. ResourceType - Right Click - Click Add Resource
    
   [Figure] Adding Resource in a resource type
   
   
2. 공유 디스크로 사용할 디스크 목록을 가져오는 작업을 진행 중입니다.
    
   [그림] 공유 디스크로 사용될 디스크 목록 가져오는 화면
   
   

3. Enter resource name and select driver letter.
   If you skip enter resource name, this will be given 'Shared_value' which value is selected driver letter.

   Warning
   When you select a drive letter, all of driver letters of the node owns even without the volume of external shared storage is displayed. Please note that do not select the driver letter of none shared storage.

   
   [Figure] Selecting driver letter View

   
   

4. As Additional Settings, check disk option is available. 
   To use this option, select Use and enter check disk argument. (Default is /F)
   Click 'OK' button.
    
   [Figure] Defining check disk option
   
   

5. Click 'Finish'button and shared disk resource is added.
   
   [Figure] Adding shared disk resource is completed

    

   
   

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