592 Implementing the IBM Storwize V5000 Gen2 with IBM Spectrum Virtualize V8.1
When the command is issued, you can set the copy direction if it is undefined, and, 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 DR 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.
10.9.10 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.
10.9.11 Starting Metro Mirror/Global Mirror consistency group
Use the startrcconsistgrp command to start an MM/GM consistency group. You can issue
this command only to a consistency group that is connected.
For a consistency group 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.
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