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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.
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※ Recommendations for installation and uninstallation |
Example of Shared Disk Configuration
Following steps are recommended to manage shared disk resource through MVL after installing MCCS.
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'Status' shows the Device Name and Lock information and Registry information as shown below.
[Figure] Volume lock Information
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To check if MVL driver is installed, it can be done through checking the list of Vollock driver is listed up by using 'fltmc' command.
[Figure] Volume lock Driver Information
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- 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 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 ViewNext steps are same as adding in resource type.
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- ResourceType → Right Click → Click Add Resource
[Figure] Adding Resource in a resource type - There is an ongoing task to import the list of disks to be used as shared disks.
[Figure] Importing the List of Disks to be Used as Shared Disks 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- 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 Click 'Finish'button and shared disk resource is added.
[Figure] Adding shared disk resource is completed
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- Select delete resource and resource will be deleted.
[Figure] Delete shared disk resource view
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| Status | Agent command | Description | Note |
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Online The volume is unlocked. You can write to it. | Offline | MVL is used to prevent user from writing/reading data to and from the disk. | |
| Monitoring | MVL and temporary text file are created to monitor if you can write to the volume. | ||
Offline The volume is locked. You can neither read or write from and to the volume. | Online | MVL is used to allow user to write/read data to and from the disk. | |
| Monitoring | MVL and temporary text file are created to monitor if you can write to the volume. | ||
Trouble The volume is online. But there is a problem caused by external elements. | Online | MVL is used to allow user to write/read data to and from the disk. | |
| Offline | MVL is used to prevent user from writing/reading data to and from the disk. |
Attribute
[Figure] Attribute of Shared Disk
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