546 Implementing the IBM Storwize V7000 with IBM Spectrum Virtualize V8.2.1
11.7.8  Changing Metro Mirror/Global Mirror consistency group
Use the chrcconsistgrp command to change the name of an MM/GM Consistency Group.
11.7.9  Starting Metro Mirror/Global Mirror relationship
Use the startrcrelationship command to start the copy process of an MM/GM relationship.
When the command is issued, you can set the copy direction if it is undefined. Optionally, you 
can mark the auxiliary volume of the relationship as clean. The command fails if it is used as 
an attempt to start a relationship that is already a part of a consistency group.
You can issue this command only to a relationship that is connected. For a relationship that is 
idling, this command assigns a copy direction (master and auxiliary roles) and begins the 
copy process. Otherwise, this command restarts a previous copy process that was stopped 
by a stop command or by an I/O error.
If the resumption of the copy process leads to a period when the relationship is inconsistent, 
you must specify the -force parameter when the relationship is restarted. This situation can 
arise if, for example, the relationship was stopped and then further writes were performed on 
the original master of the relationship. 
The use of the -force parameter here is a reminder that the data on the auxiliary becomes 
inconsistent while resynchronization (background copying) takes place. Therefore, this data is 
unusable for Disaster Recovery purposes before the background copy completes.
In the Idling state, you must specify the master volume to indicate the copy direction. In 
other connected states, you can provide the -primary argument, but it must match the 
existing setting.
11.7.10  Stopping Metro Mirror/Global Mirror relationship
Use the stoprcrelationship command to stop the copy process for a relationship. You can 
also use this command to enable write access to a consistent auxiliary volume by specifying 
the -access parameter.
This command applies to a stand-alone relationship. It is rejected if it is addressed to a 
relationship that is part of a Consistency Group. You can issue this command to stop a 
relationship that is copying from master to auxiliary.
If the relationship is in an inconsistent state, any copy operation stops and does not resume 
until you issue a startrcrelationship command. Write activity is no longer copied from the 
master to the auxiliary volume. For a relationship in the ConsistentSynchronized state, this 
command causes a Consistency Freeze.
When a relationship is in a consistent state (that is, in the ConsistentStopped, 
ConsistentSynchronized, or ConsistentDisconnected state), you can use the -access 
parameter with the stoprcrelationship command to enable write access to the auxiliary 
volume.
Adding an MM/GM relationship: When an MM/GM relationship is added to a 
Consistency Group that is not empty, the relationship must have the same state and copy 
direction as the group to be added to it.