264 Tivoli Storage Productivity Center for Replication for Open Systems
After the operations on H2 volumes are stopped, we can proceed with the following steps:
6. Start a Suspend action on the Tivoli Storage Productivity Center for Replication session.
This performs a Freeze operation that makes the H1 volumes in Consistent status. After
the action is complete, the status of the session is Severe and the state is Suspended. The
Global Mirror H1-H3 is still running.
7. Issue the RecoverH1 action on the Tivoli Storage Productivity Center for Replication
session. This performs the following actions:
Suspend the Global Copy pairs H1-I3
Failover H1 volumes
The H1 volumes are now ready to be used by host. After the action is complete, the status
of the session is Normal and the state is Target Available. After this action is run, the
Global Mirror H1-H3 is not creating consistency groups.
8. Issue the Enable Copy to Site 2 action on the Tivoli Storage Productivity Center for
Replication session. This makes available the actions to complete the go-home procedure.
This action does not change any state of the session.
Figure 4-118 Site 1 planned outage state transition diagram: Stage Three
9. Initiate a StartH1 H2 H3 action on the Tivoli Storage Productivity Center for
Replication session. This performs the following operations:
Force Failover I3 volumes to H2 volumes
Resume the Global Copy H1-I3
Failback I3 volumes to H2 volumes
Wait until the I3-H2 first pass copy is completed
Enable the Incremental Resync from H1 and I3 with noinit option
Suspend the Global Copy pairs H1-I3
Wait until the I3-H2 copy is completed (100% copied)
Failover H2 volumes
Failback H2 volumes to I3 volumes
Start H1-H2 pairs with the Incremental Resync with option override
Wait until the H2-I3 first pass copy is completed
Start the Global Mirror H2-H3
The go-home procedure is then completed and the normal operation configuration is
restored. None of these procedures required a full copy of the data.
Chapter 4. Using Tivoli Storage Productivity Center for Replication with DS8000 265
Planned outage of Site 2 storage systems
In this scenario, we consider a planned maintenance activity that requires powering off the
SIte 2 storage systems. During the maintenance activity, all of the Disaster Recovery
capabilities must be active. We also describe the go-back procedure to return to the original
configuration. The flow of the Tivoli Storage Productivity Center for Replication operations is
shown in Figure 4-119.
Assuming that the host operations are running on Site 1, we can complete the following steps:
1. Start a StartH1 H3 action on the Tivoli Storage Productivity Center for Replication
session. This starts the Global Mirror from Site 1 to Site 3 and performs the following
operations:
Freeze H1-H2 pairs
Failover I3 volumes
Stop the H2-H3 Global Mirror session
Remove the H1-H2 pairs
Start H1-I3 pairs with the Incremental Resync with option
recover
Wait until the H1-I3 first pass copy is completed
Start the Global Mirror H1-H3
Figure 4-119 Site 2 planned outage state transition diagram
Now we can proceed with powering off the storage systems in Site 2. Tivoli Storage
Productivity Center for Replication alerts you about the communication loss to Site 2
storage systems, but this does not affect the current configuration. After the maintenance
is completed and the Site 2 storage systems are running again, we can start the
procedure return to the original configuration.
2. Start a StartH1 H2 H3 action on the Tivoli Storage Productivity Center for
Replication session. This performs the following operations:
Failback I3 volumes to H2 volumes
Wait until the I3-H2 first pass copy is completed
Enable the Incremental Resync from H1 and I3 with noinit option
Suspend the Global Copy pairs H1-I3
Wait until the I3-H2 copy is completed (100% copied)
Failover H2 volumes
Failback H2 volumes to I3 volumes
Start H1-H2 pairs with the Incremental Resync with option override
Wait until the H2-I3 first pass copy is completed
Start the Global Mirror H2-H3
The go-back procedure is then completed and the normal operation configuration is restored.
None of these procedures required a full copy of the data.

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