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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.
Mirror Disk DR agent act as to mirror disk status and role.
Dynamic informations information like status and roll of Mirror Disk DR are is 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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  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 'Next' button. When add a resource from the mirror disk DR resource type name, this step will be skipped.

  3. Select the mirror volume and MCCS will renew the information.

    If you skip enter resource name, this will given 'Mirror_value' which value is selected driver letter.(Ex: Mirror_G)

    Warning

    All replicated driver letter of nodes should be assigned same driver letter.
    [Drive characters in the SAN environment (shared disk) are also displayed in the list. So, make sure you select the accurate drive characters.]
    Data will be copied to the target node and DR node from the source node.
    Be careful when you select the drive character where data exists.
    If you try to add the existing mirror volume, <mirrored> will be added to the volume letter.

        


    [Figure] Mirror Disk DR Resource Added

       

  4. Select IP address of mirror disk and offsite DR.


  5. Select mirror type.

    Be careful that when you set to synchronous mode, this cannot be changed to asynchronous mode.
    You can select the mirror type in a cluster at Local Mirror Configuration and offsite DR at Remote server.

    Sync mode : Write I/O will may be delayed depend to network band, but there is no data loss involved.
    Async mode : Relatively faster than the synch mode but it does not guarantee that target data is identical to its source when meet disaster.


  6. As 'Additional Settings', Check Disk option is available.

    Info

    <Check Disk Option>

    Set the check disk command option. For more details on the function, refer to MSDN.


    [Figure] check disk option

     

  7. When click OK button, following popup message appear.
    Confirm selected server as source.
    If you select wrong sever, clock cancel button.
     
    [Figure] Alert popup message after click OK button  

  8. Click the 'Finish' button to add the mirror disk DR resource.
    You can immediately check the result in the management web console.

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  1. Click "Delete resource" and a confirming message about deleting resource will appear.

    [Figure] check resource view    

  2. Click "OK" and a confirming message about deleting redundancy program of mirror configuration will. 

    [Figure] Delete physical mirror disk view   

  3. Click "OK" and redundancy program is deleted. Click "Cancle" and only mirror disk DR is deleted. 
    The deleted resource will immediately disappear from the management web console.

 


 


 

Status

 

 

These describe the state of mirror disk resource in a cluster regardless of the offsite DR node.

The command assumes that it is generated by a user.

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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 
SourcePriorityLevel

It indicates SourceRole Level of each node in a cluster.

Higher value of node takes 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 the number of dirtybit blocks are needed to be resync to the offsite DR.INTEGER0X 
TargetDRResyncTotalIt is the number of blocks that resync was done to the offsite DR.INTEGER X 
TargetDRRoleIt is the 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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