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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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When removing MCCS, removal is done for both MCCS and also MVL. To remove it completely. Execute 'unistall.bat of the bin' %MCCS_HOME%\bin\DiskAgent.
| Warning |
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※ 설치 및 제거 시 권고사항 |
Example of Shared Disk Configuration
Following steps are recommended to manage shared disk resource through MVL after installing MCCS.
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[Figure] Volume lock Information
Check list
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.
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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.
Adding in Resource Type
- ResourceType - → Right Click - → Click Add Resource
[Figure] Adding Resource in a resource type - 공유 디스크로 사용할 디스크 목록을 가져오는 작업을 진행 중입니다There is an ongoing task to import the list of disks to be used as shared disks.
[그림] 공유 디스크로 사용될 디스크 목록 가져오는 화면Figure] 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
Deleting
Select resource type - → right click - → delete resource.
- Select delete resource and resource will be deleted.
[Figure] Delete shared disk resource view
State
다음 테이블은 상태와 사용자 명령에 의해 발생되는 MCCS 리소스의 상태 이동에 대해 설명합니다.
명령은 사용자에 의해 발생되는 것을 전제로 합니다.
공유 디스크 에이전트: MCCS 에 등록된 공유 디스크를 관리합니다.
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온라인
볼륨에 대한 잠금이 해제되어 쓰기가 가능한 상태입니다.
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MVL을 사용하여 디스크에 읽기 및 쓰기를 불가능하게 합니다.
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MVL과 임시 텍스트 파일을 생성하여 볼륨에 쓰기 접근이 가능한지를 감시합니다.
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오프라인
볼륨이 잠긴 상태로 읽기/쓰기가 모두 불가능합니다.
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MVL과 임시 텍스트 파일을 생성하여 볼륨에 쓰기 접근이 가능한지를 감시합니다.
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장애
볼륨이 온라인 상태지만 외부적인 요인으로 문제가 발생하여 쓰기가 불가능한 상태입니다.
외부 명령 또는 다른 드라이버에 의해 볼륨에 대한 접근이 차단되거나
FC 연결 또는 SAN 스위치 등 스토리지와의 물리적인 연결 문제로 장애가 발생할 수 있습니다.
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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.
Shared disk agent: Manages the shared disks registered in MCCS.
| 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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| Attribute | Description | Type | Default | Edit | Note |
ChkdskTrue로 설정되면 볼륨 마운트 시에 디스크 검사 옵션(ChkdskArg)에 따라 디스크를 검사하고 오류를 수정합니다. | If the option is set to true, when the volume is mounted, according to the checkdisk options(ChkdskArg), disk is tested for errors. | BOOLEAN | false | O | |
ChkdskArg | 체크디스크When the checkdisk (Chkdsk) 가 true 일 때 체크 디스크 명령 옵션을 지정합니다option is set to true, the check disk command option is activated. | STRING | /F | O | |
DriveLetter | 볼륨의 드라이버 문자를 지정합니다Designate the drive characters for the volume. | STRING | O |
Attribute value of ArgList arguments are the values that are added resources and the value can be changed or viewed through Specified through 'Specified Attribute’ list on the detailed information panel.
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