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After the operations on H2 volumes are stopped, we can proceed with the following steps:
1. Issue the Suspend action on the Tivoli Storage Productivity Center for Replication session.
This performs the following actions:
– Change the mode for H2-H1 pairs from Global Copy to Metro Mirror
– Wait until the H2-H1 pairs are in Full Duplex
– Freeze H2-H1 pairs
After the action is complete, the status of the session is Severe and the state is
Suspended.
2. Issue the Recover action on the Tivoli Storage Productivity Center for Replication session.
This makes the H1 volumes available to the host that is performing an H1 to H2 failover.
After the action is complete, the status of the session is Normal and the state is Target
Available.
3. 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.
Now we can start the host operations on the H1 volumes and complete the go-home
procedure. We start a StartH1  H2 action on the Tivoli Storage Productivity Center for
Replication session. This performs the following operations:
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Remove H1-H2 pairs
Start H1-I2 pairs in Global Copy mode
Wait until the H1-I2 first pass copy is completed
Start the Global Mirror H1-H2
The go-home procedure is then completed and the normal operation configuration is
restored. In this case, a full copy of the data is required (for more information, see 4.3.4,
“Scenarios requiring a full copy” on page 241).
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. 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 4-113 on page 259.
Assuming that the host operations are running on Site 1, we can complete the following steps:
1. Start a Suspend action on the Tivoli Storage Productivity Center for Replication session.
This performs a Global Mirror pause operation and a suspension of the Global Copy pairs
H1-I2. After the action is complete, the status of the session is Severe and the state is
Suspended.
Now we can proceed with powering off the storage systems in Site 2. Tivoli Storage
Productivity Center for Replication alerts us 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 to return to the original configuration.
2. Start a StartH1  H2 action on the Tivoli Storage Productivity Center for Replication
session. This performs the following operations:
– Resume the Global Mirror H1-I2
– Wait until the H1-I2 first pass copy is completed
– Start the Global Mirror H1-H2
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Tivoli Storage Productivity Center for Replication for Open Systems