HP 3PAR Operating System Software - Manual (Page 99)

12 Remote-Copy Pairs and Targets
See the following: For more information about:
“Remote-Copy Pairs” (page 99) The foundational remote-copy system relationship
“Overview of Targets” (page 99) Why remote copy uses targets
“Target Definitions” (page 99) How to determine the target definition for a system or
volume group
“Remote-Copy Target System” (page 100) The target system, and data flow between systems under
various circumstances
Remote-Copy Pairs
Remote-copy configurations and operations are based on a linked pair of storage systems, which
are called a remote-copy pair.
In a remote-copy pair, one system is the primary system and one is the backup system. The primary
system holds the primary virtual volumes, and the backup system holds the secondary virtual
volumes. Secondary virtual volumes contain copies of the primary virtual volumes.
For additional information, see the following:
•
“Selecting a Remote-Copy Configuration” (page 16)
•
“Working with Volume Groups” (page 110)
Overview of Targets
When you set up HP 3PAR Remote Copy, you configure the backup system in the remote-copy
pair as the target of the primary system, and the primary system as the target of the backup system.
Creating targets on both systems in a remote-copy pair:
•
Links the systems.
•
Allows for data flow in either direction, depending on the configuration and on temporary
situations such as downtime or failure and disaster recovery.
For additional information, see the following:
•
“System Roles and Direction of Data Flow” (page 101)
•
“Setting Up a Unidirectional Configuration” (page 76)
Target Definitions
A target definition identifies the target system for remote-copy operations. The target system is the
other system in the remote-copy pair.
You specify target definitions for each system during remote-copy setup.
A target definition is the name of the other storage system in the remote-copy pair.
For example, in a System1/System2 remote-copy pair, you specify target definitions as follows:
•
On System1, the target definition is System2.
•
On System2, the target definition is System1.
The name used for the target definition is not required to match the system name.
Remote-Copy Pairs 99