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It is managed disk using Mantech Volume Lock(MVL) bundled in MCCS.
Within a cluster, the application may be store the data on shared disk when it is equipped. MVL attach the file system on shared disk to the only active server and lock to the standby server to prevent file system corruption. When managed as mentioned above, shared disk is defined as the drive letter.
A shared disk agent of the MCCS manages the lock/un-lock of the disk and monitors volume is read/writable state through communication with the MVL driver.

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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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Warning

※ Recommendations for installation and uninstallation
MVL is a legacy kernel filter driver. Thus, you must first run the install.bat / uninstall.bat file provided by MCCS and reboot the system.

Example of Shared Disk Configuration

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

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  1. Select delete resource and resource will be deleted. 
     
    [Figure] Delete shared disk resource view

 

 

Status

 The following table explains the status switching of the MCCS resource caused by a user's command and the status.
The command assumes that it is generated by a user.

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