HP 3PAR Remote Copy Software - Manual (Page 23)

2.7 Remote Copy Configuration
InForm OS Version 2.3.1 Remote Copy User’s Guide
2.5 Remote Copy Configuration
As stated previously, Remote Copy configurations are based on the relationship between a pair
of InServ Storage Servers (Remote Copy pair). The storage servers in the Remote Copy pair play
multiple roles at the same time. Both storage servers can function as both the primary and
backup servers and can hold primary and secondary volume groups. This configuration is
referred to as a bidirectional Remote Copy configuration. Conversely, a Remote Copy setup
where all groups are primary on one server and all groups are secondary on the other server is
referred to as unidirectional. A combination of bidirectional (for one Remote Copy pair) and
unidirectional configurations can be used in multi-Remote Copy pair setups (N-to-1 or
1-to-N configurations). Each configuration is discussed further in the sections that follow.
2.5.1 Bidirectional Configurations
In a bidirectional Remote Copy pair, each storage server provides backup for the other, but
only for selected volume groups. Figure 2-2 illustrates how this configuration might work with
a single Remote Copy pair.
Figure 2-2. Bidirectional Remote Copy
Primary
Volume
Secondary
Volume
InServ1
InServ2
Group X
Group X.r
Secondary
Volume
Group Y.r
Primary
Volume
Group Y
Direction of data
replication
Group X to Group X.r
Group Y to Group Y.r