In an active/passive many-to-one replication topology, multiple HCP systems replicate to a single other HCP system. For an explanation of this topology, see Active/passive many-to-one replication.
To recover from a single primary system failure in an active/passive many-to-one replication topology, you follow the normal pattern:
1.Fail over the link between the failed primary system and the replica.
2.When the primary system becomes available again, restore the link from the replica.
3.Begin and complete data recovery from the replica to the primary system.
If more than one primary system fails in an active/passive many-to-one topology, you need to fail the link from each failed system over to the replica. Multiple inbound links on the replica can be in the failed-over state at the same time.
When the failed systems become available again, you can restore the links at any time. However, you can perform data recovery on only one link at a time. (You don’t need to wait for all the failed systems to become available before recovering data to the first one.)
For example, suppose systems A, B, and C all replicate to system D. If both A and B fail, you can return to normal replication with these steps after the failed systems become available again:
1.On system D, restore the link from A to D.
2.On system D, begin and complete data recovery from D to A.
3.On system D, restore the link from B to D.
4.After the recovery of data from D to A is complete and replication from A to D has restarted, on system D, begin and complete data recovery from D to B.
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