Chapter 11. Advanced Copy Services 545
The chpartnership command
To change the bandwidth that is available for background copy in the system partnership, use 
the chpartnership -backgroundcopyrate <percentage_of_link_bandwidth> command to 
specify the percentage of whole link capacity to be used by the background copy process.
11.7.5  Creating a Metro Mirror/Global Mirror consistency group
Use the mkrcconsistgrp command to create an empty MM/GM Consistency Group.
The MM/GM consistency group name must be unique across all consistency groups that are 
known to the systems owning this consistency group. If the consistency group involves two 
systems, the systems must be in communication throughout the creation process.
The new consistency group does not contain any relationships and is in the Empty state. You 
can add MM/GM relationships to the group (upon creation or afterward) by using the 
chrelationship command.
11.7.6  Creating a Metro Mirror/Global Mirror relationship
Use the mkrcrelationship command to create a MM/GM relationship. This relationship 
persists until it is deleted.
The auxiliary volume must be equal in size to the master volume or the command fails. If both 
volumes are in the same system, they must be in the same I/O Group. The master and 
auxiliary volume cannot be in an existing relationship, and they cannot be the target of a 
FlashCopy mapping. This command returns the new relationship (relationship_id) when 
successful.
When the MM/GM relationship is created, you can add it to an existing Consistency Group, or 
it can be a stand-alone MM/GM relationship.
The lsrcrelationshipcandidate command
Use the lsrcrelationshipcandidate command to list the volumes that are eligible to form an 
MM/GM relationship.
When the command is issued, you can specify the master volume name and auxiliary system 
to list the candidates that comply with the prerequisites to create a MM/GM relationship. If the 
command is issued with no parameters, all of the volumes that are not disallowed by another 
configuration state, such as being a FlashCopy target, are listed.
11.7.7  Changing Metro Mirror/Global Mirror relationship
Use the chrcrelationship command to modify the following properties of an MM/GM 
relationship:
/SM590000Change the name of an MM/GM relationship.
/SM590000Add a relationship to a group.
/SM590000Remove a relationship from a group by using the -force flag.
Optional parameter: If you do not use the -global optional parameter, a Metro Mirror 
relationship is created rather than a Global Mirror relationship.