Appendix H. Mirror Management Console
- 헌규임
- 이진현
- JuneL (Unlicensed)
The mirror management console is provided only for the individual mirror resources managed by MCCS.
The mirror management console operates independently from the engine logic of MCCS, so during operation, it can collide with MCCS.
The mirror management console informs users of the mirror volume status and the capacity of the mirror in use. You can change the bandwidth and the mirror network addresses in it.
Table of Contents
Screen configuration
Mirror management screen
The following mirror management screen is used.
[Figure] Mirror management screen
Mirror set configuration
The mirror resource configured in MCCS is expressed as a single mirror set.
| Figure | Description |
Volume |
| The volume role is Source. |
 | The volume role is Target. | |
Status
|
| The status is Mirroring. |
| The status is Resyncing. Displays the progress for resyncing. | |
 | The status is Paused. | |
 | There is a dirtybit in the volume. | |
 | Split brain occurred. |
Mirror management command descriptions
Right click with your mouse button on the mirror set volume to see the descriptions of the mirror management commands that can be selected.
| Menu | Description |
Source | Pause | The mirror status will be changed to PAUSE and replication will be paused. |
| Resync | The mirror status will be changed to RESYNCING and the full synchronization will be initiated between node. | |
| Resume | Resume MIRRORING the mirror disk which was paused. Resynchronization will take place in advance, if there is data change during paused. | |
Target | Lock | The volume is locked to prevent access the volume from the node. |
Unlock | Unlock the target volume to access read only purpose. Mirror status should be paused in advance. |
When you unlock the target volume, you can access the volume read only purpose. It can cause a negative effect to the mirror.
Even if you unlock it, you cannot write to the disk. If you want to "write" to the disk, you must manually change the readOnly attributes in the registry. But it does not highly recommended to secure data integrity.
Descriptions of properties setting
[Figure] Mirror Management Screen
Attribute name | Description |
JOB ID | JOB ID is displayed. |
| Bit Map | It is the directory containing the intent log. |
Compression level | It represents the compression level for a specific copy set. The setting range is from 0 to 9. |
Empty async queue | Even if a driver receives a request for deleting a queue, this function can be used to prevent deletion of queues on a specific volume. |
| Bandwidth | It is the max network bandwidth (kbps/sec) that can be used by a copy set. |
| Mirror network address | IP address of mirror disk between nodes in a cluster. |
Screen configuration
Shared disk DR management screen
Shared disk DR management screen is as follows.
[Figure] Shared Disk DR Management Screen
Node access status
It represents the status of node accessing the shared disk.
[figure] Shared disk DR node access status
Figure | Description |
| Both nodes accessing the volume |
| Active1 node accessing the volume |
 | StandBy1 node accessing the volume |
 | Neither of nodes accessing the volume |
Mirror set configuration
The shared disk DR resource configured in MCCS is expressed as a single mirror set.
| Figure | Descriptions |
Volume | | The disk status in the Primary site. |
 | The disk status in the off-site DR. | |
Status
|
| The volume in the MIRRORING status. |
| Volume in the RESYNCING status. The progress bar is displayed during RESYNCING . | |
| The volume in pause status. | |
| Dirtybit occurred in the volume. | |
| split-brain occurred | |
 | DR volume status in NONE. |
Shared disk DR management menu
Right click with your mouse button on the mirror set volume in mirror volume to see the descriptions of the mirror management commands that can be selected.
| Menu | Descriptions |
Source | Pause | The mirror status will be changed to PAUSE and replication will be paused. |
| Resync | The mirror status will be changed to RESYNCING and the full synchronization will be initiated between node. | |
| Resume | Resume MIRRORING the mirror disk which was paused. Resynchronization will take place in advance, if there is data change during paused. | |
Target | Lock | The volume is locked to prevent access the volume from the node. |
Unlock | Unlock the target volume to access read only purpose. Mirror status should be paused in advance. |
When you unlock the target volume, you can access the volume read only purpose. It can cause a negative effect to the mirror.
Even if you unlock it, you cannot write to the disk. If you want to "write" to the disk, you must manually change the readOnly attributes in the registry. But it does not highly recommended to secure data integrity.
Shared disk DR Properties
[Figure] Shared Disk DR Management Screen
Attribute name | Descriptions |
JOB ID | JOB ID is displayed. |
| MirrorEndPoints | Shows the information of all jobs defined in the mirror. (Node name, Letter, MirrorIP, Mirror mode) |
Compression level | It represents the compression level for a specific copy set. The setting range is from 0 to 9. |
Flush Async Queue | Even if a driver receives a request for deleting a queue, this function can be used to prevent deletion of queues on a specific volume. |
| Bandwidth | It represents the max network bandwidth (kbps/sec) that can be used by a copy set. |
| Mirror network address | IP address of data replication between a cluster and an offisite DR. |