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

Mirror Disk Console

Mirror disk management console

The following screen is mirror disk management console.

[Figure] Mirror disk management console

Mirror disk Status

Mirror console show mirroring status as follows.

	Figure	Description
Volume		The volume role is Source. Displays the capacity in use on the right side of the volume.
		The volume role is Target.
		The volume status is Diskless.
Status		The status is Mirroring.
		The status is Resyncing. Displays the progress for resyncing.
		The status is Paused.
		Split brain is 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	Decription
Connect	Connect communication path between two nodes for mirror disk.
Disconnect	Disconnect communication path between two nodes for mirror disk.
Forceful sync	The mirror status is changed to RESYNCING and full synchronization from source to target is initiated.

Descriptions of properties setting

[Figure] Mirror Management Screen

Attribute name	Description
Virtual device path	Shows the mounting point.
Meta device path	Shows the meta device. Meta device path cannot be changed if it is online.
Resynchronization ratio	Set the resynchronization ratio. (Setting range: 0 - 640MB)
Send Buffer Size	Set a size of a buffer for asynchronization transfer of data.
Congestion Fill	In asynchronization mode, it logs as OOS if reaches for the size set here.
Mirror network address	IP address of mirror disk between nodes in a cluster.

The following attributes work just on asynchronization mode for data transfer, and are applied through the drbaadm down, up command after modifying their values: The Send Buffer Size, Congestion Fill attributes.

Mirror IP address is able to be edited. But this can be done when mirror state is paused.
If mirror status is MIRRORING when you edit the mirror IP address, the status changed to PAUSE automatically. Select the resume from mirror menu to resume the mirroring after done this.

Policy for recovering auto split brain

Node Priority	policy	Description
Secondary-Secondary	Toss the last primary node	Start synchronization at the node that was primary before a split brain occurred.
	Toss the first primary node	Start synchronization at the node that was second primary before a split brain occurred.
	Toss the one with small changes	Start synchronization at the node with greater changes when a split brain occurred.
	Toss the one with no changes	If only one node has changes, start synchronization on it. If the both nodes have no changes, synchronize either one. If the both node have changes, disconnect communication.
	Disconnect	Cut off a connection without auto recovery.
Primary-Secondary	Consensus	Apply the same recovery policy that is applicable when all the nodes are secondary. If auto recovery fails, disconnect communication.
	Toss secondary node	Make the secondary as a sacrifice node.
	Disconnect	Cut off a connection without auto recovery.
Primary-Primary	Disconnect	Cut off a connection without auto recovery.

Shared disk DR Console

Shared disk DR management console

Shared disk DR management console 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 capacity in use is displayed on the right side of the volume.
		The volume status is Diskless.
		The disk status in the off-site DR node.
Status		The volume in the MIRRORING status.
		Volume in the RESYNCING status. The progress bar is displayed during RESYNCING .
		The volume in pause status.
		split-brain is occurred.

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
Connect	Connect communication path between primary site's source node and off-site DR node.
Disconnect	Disconnect communication path between primary site's source node and off-site DR node.
Forceful sync	The mirror status is changed to RESYNCING and full synchronization from source to target is initiated between primary site to off-site DR node.
Pause	The mirror status will be changed to PUASE and replication will be paused.
Resume	Resume MIRRORING the mirror disk which has been paused. Resynchronization will take place in advance, if there is data changed during paused.

Shared disk DR Properties

[Figure] Shared Disk DR Properties

Attribute name	Description
Virtual device path	Shows the mounting point.
Meta device path	Shows the meta device.
Mirror network address	Copy the volume to the set IP address.

Mirror disk DR console

Mirror disk DR management console

Mirror disk DR management console is as follows.

[Figure] Mirror disk DR console.

Mirror disk set

Mirror disk resource in a cluster is expressed as an MirrorSet.

	Figure	Description
Volume		The disk role is source in the Primary site. The capacity in use is displayed on the right side of the volume.
		The disk role is target in the Primary site.
		The volume status is Diskless.
		The disk status in the off-site DR node.
Status		The volume status is Mirroring.
		The volume status is Resyncing. Displays the progress for resyncing.
		The volume status is Pause.
		Split brain is occurred.

Mirror disk DR management menu