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Mirror Disk DR resource enables replicate a mirror disk set of a cluster to an offsite node of disaster recovery purpose.
미러 디스크 DR 에이전트는 미러 볼륨의 상태와 역할에 따라 동작이 결정됩니다.
미러 디스크 DR 리소스는 상태, 역할과 같은 동적인 정보는 모두 시스템 이벤트 로그에 기록되며, MCCS의 이벤트 로그 모니터 모듈에 의해 MCCS로 전달됩니다Mirror Disk DR agent act as to mirror disk status and role.
Dynamic informations like status and roll of Mirror Disk DR are logged into system event log, this is sent to MCCS by MCCS Event Module.
MCCS Event Module is activated when MCCS service starts.
Data replication software operates by creating mirror set for volumes between two nodes.
Source volume is sit on Primary node, Target volume is sit on Secondary node in a cluster and offsite DR node.
Client is only available to read/write in the source volume, changed block of the volume is replicated to the target volume through the TCP/IP network connection. At this point, target volume is in lock state and read/write is not allowed. This is to ensure data integrity by preventing the use of target volume.


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[Figure] Mirroring Configuration

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Mirror Mode

Replication option 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.

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Attribute

Desctiption

TypeDefaultEditNote
AutoResolveSplitBrain

If it is set to 'true', it will automatically resolve the split brain issues.

BOOLEANtrueO 
ChkDsk

When the volume is mounted, according to the 'ChkdskArg', disk is tested for errors.
If it is set to true, and if dirty bits are set to the online volume, the ChkdskArg option will be used to run checkdisk.
Before running checkdisk, the mirror copying will be automatically stopped and resynchronization will be performed after finished..

BOOLEANfalseO 
ChkdskArg

When the Chkdsk option is set to true, the check disk command option is activated.

STRING/FO 
DirtyBit

It means that dirty bits are set to the target mirror volume.
In general, if you need to check the integrity of the target volume, the system will set this.

BOOLEANfalseX 
DomainMemberServer

If the node to configure the mirror resource is a member server of the Windows domain, you must set it to "true".
Now, the Windows service account to start the DK service should be set as Administrator for the local node.

BOOLEANfalseO 

DriveLetter

The mirror volume is assigned to the drive character.
It should be configured to obtain the same value at the source and the target systems.

STRING X 
MirrorDRIPThe DR IP address used to copy the volume.STRING X 
MirrorIP

The IP address used to copy the volume.

STRING X 
MirrorRoleThe mirror role of the mirror volume.
It is renewed from an event log.		STRING X 
MirrorState

The mirror status of the mirror volume.
It is renewed from an event log.

STRING X 
MirrorTimeout

This is the time limit for mirror role or status updates in the process of volume failovers or switching.
If the status or role is not renewed within this time period, a time out error will occur.

INTEGER120 secO 
MirrorTypeDetermine the mirror synchronization mode. Set it to A or S.
( A - async mode, S - sync mode)
* If it is set to asynch mode, data loss can occur.		STRINGAX 
Password

It is the password for the designated user account.
Unless you set it otherwise before, now, enter the password for the 'Administrator' account.

PASSWORD O 
ResyncNeedIt represents the total sum of the blocks requiring resynchronization.INTEGER0X 
ResyncTotalIt is the total sum of the resynchronization blocks.INTEGER0X 
SourcePriorityLevel각 노드의 SourceRole Level을 나타냅니다. 값이 높은 노드가 최종적으로 Source Role을 가집니다

It indicate SourceRole Level of each node in a cluster.

Higher value of node take Source Role.

STRING X 
TargetDRIPIt is the IP address of data replication for the offsite DR.STRING X 
TargetDRLetterIt is the drive letter for the offsite DR volume.STRING0X 
TargetDRResyncNeedIt is number of dirtybit blocks are needed to be resync to the offsite DR.INTEGER0X 
TargetDRResyncTotalIt is number of blocks that resync was done to the offsite DR.INTEGER X 
TargetDRRoleIt is role of mirror volume of the offsite DR.STRING X 
TargetDRStateIt shows data transfer state between source volume and target volume.STRING X 
TargetDRTypeIt shows data sync mode between mirror disk set and offsite DR.STRING X 
TotalSpaceIt represents the total size of the target mirror volume.INTEGER X 
UsedSpaceIt represents the available size of the target mirror volume.INTEGER X 
User

The user account to run the mirror related commands.
Unless you set it otherwise before, now, the 'Administrator' account will be used.

STRINGAdministratorO 

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