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A shared disk agent is an agent that manages the shared disks.
Data on the shared disks will be damaged if you try to access to write from multiple nodes (or servers).
Thus, to control the situations, we only mount the file system from an operation node and unmount it to prohibit writing access from a standby node.
A shared disk agent manage mounting and unmounting of disks and monitors whether it is writable.

 

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Adding

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.

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공유 디스크 리소스를 추가 합니다.
공유 디스크 리소스를 추가 하기 위해서는 사전에 추가 가능한 공유 디스크가 OS상에 구성되어 있어야 합니다.

  1. select a group → right click → 'Add Resource'.
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    [Figure] Adding Resource in a group

  2. Select 'SharedDisk' from Resource Type lists and click 'Next' button.
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    [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
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    [Figure] Adding Shared disk Resource in a resource type
    Enter resource name, file system name, volume device file location and mount point.
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    [Figure] Shared disk resource information view

    You can also browse the file name as click the file icon.
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    [FIgure] Click on file selection icon view

    Click "Finish" when all of the values are entered. 
    사용자는 공유 디스크 의 파일시스템 타입, 양 노드의 볼륨 장치 파일 위치 그리고 마운트 지점 의 정보를 입력 해야 합니다.
    볼륨 장치 파일의 위치를 모를 경우 Image Added'파일' 버튼을 눌러  다이얼로그상에서 장치 파일을 선택 할 수 있습니다.

    [Figure] Finish Button Active after Entering All the Data


  2. As Additional Settings, mount command option, forced to unmount option, filesystem check option is available.

    [Figure] Additional setting view


  3. 완료 버튼을 클릭하면 기본 공유 디스크 리소스가 추가 되며, 
     관리 웹 콘솔 상에서 바로 확인이 가능합니다.

Deleting

Select resource type →- right click → delete resource.

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삭제된 리소스는  관리 웹콘솔 상에서 바로 사라집니다.   

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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StatusAgent commandDecriptionNote

Online

The volume is unlocked. You can write to it.

Offline

Dismounts the volume and prevents user from writing/reading data to and from the disk.

 
Monitoring

Checks if the volume is mounted and monitors if you can write to the volume by creating temporary files.

 

Offline

The volume is locked. You can neither read or write from and to the volume.

OnlineMounts the volume and allow user to write/read data to and from the disk. 
Monitoring

Checks if the volume is mounted and monitors if you can write to the volume by creating temporary files.

 

Trouble

The volume is online. But there is a problem caused by external elements. You cannot write to it.
Access to the volume can be prohibited by the external commands or other driver, or the physical connections to the storage such as FC connections or SAN switches can cause troubles

OnlineMounts the volume and allow user to write/read data to and from the disk. 
OfflineDismounts the volume and prevents user from writing/reading data to and from the disk. 

 

 

Attribute

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[FigureAttribute of Shared Disk공유 디스크 리소스의 고유 속성을 표시 합니다.

Attribute

Description

Type

DefaultEditNote

DevPath

Designate the path for the file of device to mount.

FILE

 O 

DoFsck

If it is set to true, going online will execute a fsck on the volume.

BOOLEAN

falseO 

FileSystem

Enter the type of file system used by the volume.

STRING

 O 
ForceUnmountIf it is set to true, going offline will forcefully unmount the device in use.BOOLEANfalseO 
FsckOptEnter the option used for fsck execution.STRING-aO 
MountOptEnter the command option used for mounting.STRING O 
MountPointEnter the absolute path for the mounting location.DIRECTORY O 

The attribute value is entered to register the resource, and you can change or check it in the 'Specified Attribute'.