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Chapter 2 Data Replication
18
Copy control states can be specified when Replicate or Restore is performed. You can also change the
copy control state you specified at Replicate or Restore as required.
When Restore with RV protection specified is executed, only copy for reflecting the difference is
executed, thus the updated data of the MV is not reflected into the RV. Therefore, specifying or
changing a copy control state (Synchronous Copy Mode, Semi-synchronous Copy Mode, or
Background Copy) has no effect.
There are the following five instructions to change the copy control state.
• Synchronous Copy instruction
• Semi-synchronous Copy instruction
• Resume instruction
• Background Copy instruction
• Suspend instruction
The Resume instruction changes Background Copy or Suspend to preceding Foreground Copy
(Synchronous Copy Mode, Semi-synchronous Copy Mode).
Figure 2-6 shows the state transition diagram of the copy control states.
Figure 2-6 State Transition Diagram of Copy Control State
Foreground Copy
Background
Copy Instruction
* Semi-synchronous Copy Mode
can be used only for a
RemoteDataReplication pair
Suspend Instruction
Background Copy Instruction
Suspend
Synchronous Copy or
Semi-synchronous
Copy or Resume
Synchronous Copy or
Semi-synchronous Copy
or Resume Instruction
Suspend Instruction
Background Copy
Semi-
synchronous
Co
py
Mode*
Sync Copy
Mode
normal abnormal
Copy Fault