System A fails

To return to normal operation after system A fails:

1.On system B, fail link AB over to B.

T1 and D1 become read-write on B.

2.When system A becomes available again, on system B, restore link AB.

3.On system A, accept the restored link.

4.On system B, begin and complete data recovery on link AB.

When data recovery is complete, T1 and D1 become read-write on A and read-only on B, and replication resumes on link AB.

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