Appendix H- Mirror Management Console

Appendix H- Mirror Management Console

 

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 condition is Source.
Displays the capacity in use on the right side of the volume. 

The volume condition is Target.

Status

 

The volume condition is Mirroring.

The volume condition is Resyncing.
Displays the progress bar for resyncing.

The volume condition is Pause.

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

Decription

Connect

Set up communication between two hosts that share the copied data sets.

Disconnect

Disconnect communication between two hosts that share the copied data sets.

Forceful sync

If you use the forceful sync command, the status will be changed to RESYNCING and the full synchronization will be done forcefully.

Descriptions of properties setting

[Figure] Mirror Management Screen

 

Attribute name

Description

Virtual device path

Shows the mounting point.

Meta device path

Shows whether a meta device is internal or external.
Meta device path cannot be changed if it is online.

Resynchronization ratio

Set the resynchronization ratio. (Setting range: 0 - 640MB)

Mirror network address 

Copy the volume to the set IP address.

 

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.