Chapter 10. Copy services 587
4. The MM/GM relationship is started and when the background copy completes, the
relationship is consistent and synchronized.
5. When synchronized, the auxiliary volume holds a copy of the production data at the
master that can be used for disaster recovery.
6. To access the auxiliary volume, the MM/GM relationship must be stopped with the access
option enabled before write I/O is submitted to the auxiliary.
Following these commands, the remote host server is mapped to the auxiliary volume and the
disk is available for I/O.
For more information about MM/GM commands, see IBM Spectrum Virtualize and SAN
Volume Controller and Storwize family Command-Line Interface User’s Guide, GC27-2287 at
the following link:
https://ibm.biz/BdjaUk
The command set for MM/GM contains the following broad groups:
Commands to create, delete, and manipulate relationships and Consistency Groups
Commands to cause state changes
If a configuration command affects more than one system, MM/GM performs the work to
coordinate configuration activity between the systems. Certain configuration commands can
be performed only when the systems are connected, and fail with no effect when they are
disconnected.
Other configuration commands are permitted even though the systems are disconnected. The
state is reconciled automatically by MM/GM when the systems become connected again.
For any command (with one exception) a single system receives the command from the
administrator. This design is significant for defining the context for a CreateRelationship
mkrcrelationship or CreateConsistencyGroup mkrcconsistgrp command, in which case the
system that is receiving the command is called the
local system.
The exception is a command that sets systems into a MM/GM partnership. The
mkfcpartnership and mkippartnership commands must be issued on both, the local and
remote systems.
The commands in this section are described as an abstract command set, and are
implemented by either of the following methods:
CLI can be used for scripting and automation.
GUI can be used for one-off tasks.
10.9.2 Listing available system partners
Use the lspartnershipcandidate command to list the systems that are available for setting
up a two-system partnership. This command is a prerequisite for creating MM/GM
relationships.
Note: This command is not supported on IP partnerships. Use mkippartnership for
IP connections.
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