Tivoli Storage Productivity Center for Replication for Open Systems

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.