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[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.
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Asynchronization 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
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Synchronization 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
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Synchronization 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
Add the mirror disk DR resource to a group.
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- Select a group → right click → "Add Resource'".
Select "MirrorDisk'" from Resource Type lists and click the "Nex"' button.
Select the mirror volume and MCCS will renewal the information automatically.
The virtual device, mirror IP address and mirror ports will be entered automatically.
Info If mirror volume is already configured in the volume, "mirrored" will be displayed.
Also, the config data will be entered automatically during the selection, and you cannot change it.
[Figure] Mirror Disk DR Added- Click the "Finish" button to add the mirror disk DR.
Deleting
Select "Resource type" → right click → delete resource.
- Click the "Delete resource" button and a confirming message about deleting resource will appear.
[Figure] Check resource view - Click the "OK" button and mirror disk is deleted.
The deleted resource will immediately disappear from the management web console.
State
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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*If the mirror volume is not defined, It is regarded as the offline state.
Attribute
Show the unique attribute of resource.
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