IBM Storwize V5020 User Manual

578 Implementing the IBM Storwize V5000 Gen2 with IBM Spectrum Virtualize V8.1
10.7.20 Remote Copy states and events
This section describes the various states of a MM/GM relationship and the conditions that
cause them to change. In Figure 10-88, the MM/GM relationship diagram shows an overview
of the status that can apply to a MM/GM relationship in a connected state.
Figure 10-88 Metro Mirror or Global Mirror mapping state diagram
When the MM/GM relationship is created, you can specify whether the auxiliary volume is
already in sync with the master volume, and the background copy process is then skipped.
This capability is useful when MM/GM relationships are established for volumes that were
created with the format option.
The following step identifiers are shown in Figure 10-88:
򐂰 Step 1:
a. The MM/GM relationship is created with the -sync option, and the MM/GM relationship
enters the ConsistentStopped state.
b. The MM/GM relationship is created without specifying that the master and auxiliary
volumes are in sync, and the MM/GM relationship enters the InconsistentStopped
state.
򐂰 Step 2:
a. When a MM/GM relationship is started in the ConsistentStopped state, the MM/GM
relationship enters the ConsistentSynchronized state. Therefore, no updates (write
I/O) were performed on the master volume while in the ConsistentStopped state.
Otherwise, the -force option must be specified, and the MM/GM relationship then
enters the InconsistentCopying state while the background copy is started.
b. When a MM/GM relationship is started in the InconsistentStopped state, the MM/GM
relationship enters the InconsistentCopying state while the background copy is
started.

IBM Storwize V5020 Specifications

General

Brand	IBM
Model	Storwize V5020
Category	Storage
Language	English