[Figure] Mirroring Configuration

Mirror Mode

Mirror mode employs both asynchronous and synchronous mirroring schemes. Understanding the advantages and disadvantages between synchronous and asynchronous mirroring is essential to the correct operation of this.

Async mode

With asynchronous mirroring, each write is captured and a copy of this is made. That copy is queued to be transmitted to the target system as soon as the network will allow it. Meanwhile, the original write request is committed to the underlying storage device and control is immediately returned to the application that initiated the write. At any given time, there may be write transactions waiting in the queue to be sent to the target machine.  But it is important to understand that these writes reach the target volume in time order, so the integrity of the data on the target volume is always a valid snapshot of the source volume at some point in time.  Should the source system fail, it is possible that the target system did not receive all of the writes that were queued up, but the data that has made it to the target volume is valid and usable.

Semi-sync mode

With semi-synchronous mirroring, each write is captured and transmitted to the target system. Local write completes in the source as soon as the replication packet has reached the target. Normally, no writes are lost in case of failover , but this may can be lost when both nodes are failed simultaneously.

Sync mode

With synchronous mirroring, each write is captured and transmitted to the target system to be written on the target volume at the same time that the write is committed to the underlying storage device on the source system.  Once both the local and target writes are complete, the write request is acknowledged as complete and control is returned to the application that initiated the write.  With synchronous mirroring, each write is intercepted and transmitted to the target system to be written on the target volume at the same time that the write is committed to the underlying storage device on the source system.  Once both the local and target writes are complete, the write request is acknowledged as complete and control is returned to the application that initiated the write.

Adding

미러 디스크 DR 리소스를 그룹에 추가합니다.

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미러 디스크 DR 리소스로 사용 할 드라이브 문자를 선택하고, 소스 서버로 선택 합니다

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[그림] 미러디스크 DR 리소스 추가 화면

"추가 정보"를  클릭하여 클러스터링되지 않은 원격지 호스트의 구성 정보를 확인합니다.

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[그림] 미러 디스크 DR 추가설정 화면

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삭제

해당 리소스 선택  -> 마우스 우 클릭 -> 리소스 삭제를 선택합니다.

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상태

다음 테이블은 상태와 사용자 명령에 의해 발생되는 MCCS 리소스의 상태 변화에 대한 설명입니다.

미러 디스크 DR 에이전트: 미러 디스크를 관리하며, 복제 프로그램이 설치되어 있어야 합니다. 

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온라인

소스 볼륨이 접근 가능하고 쓰기 테스트가 정상적으로 이루어지는 상태입니다.

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복제 상태를 Secondary로 변경합니다.

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<소스 볼륨>
복제 상태가 Primary이며 데이터가 UptoDate임을 확인합니다.

<타깃 볼륨>
복제 상태가 Secondary 임을 확인합니다.

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오프라인

온라인, 장애 상황을 제외한 상황은 모두 오프라인 상태입니다.

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복제 상태를 Primary로 변경합니다. 

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위에 모니터링 명령 설명 참조

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장애

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위에 온라인 명령 설명 참조

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위에 오프라인명령 설명 참조

속성

리소스의 고유 속성을 표시 합니다.

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Attribute

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설명

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Add the Mirror disk DR resource to a 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.
2. Select "MirrorDisk DR" from Resource Type lists and click the "Next" button 

3. Enter the resource name and select Mirror Volume in the cluster.

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   [Figure] Mirror Disk DR add Screen

    

4. To check configuration information on a remote host which has not been clustered, Click the "More Information" button.

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   [Figure] Mirror disk DR addition setting screen

5. The DR resource of the shared disk is added after clicking the "Finish" button  

Deleting

Select the "Resource" → Right click → Delete the resource.

1. Click the "Delete resource" button and a confirming message about deleting resource will appear.
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2. Click the "OK" button and mirror disk is deleted.
   The deleted resource will immediately disappear from the management web console.

State

The following table describes MCCS resources' status conversion occurred by state changes or user's commands.

Mirrored disk DR agent: Manages a mirrored disk, and to use this, it is necessary to install a replication program.

Attribute

Show the specified attribute of Mirror disk DR resource.

※ DR 호스트의 정보는 각 속성에 DR 호스트 이름으로 개별 표시 됩니다.

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Specified attribute values are normally entered when add the resource, This value can be edited or viewed through "Specified Attribute" table in the Resource Attributes tab on the detailed information panel.