To return to normal operation after system B fails:
1.On system C, fail link BC over to C.
T1 and D1 remain read-write on A and read-only on C. T2 becomes read-write on C.
2.When system B becomes available again, on system A, restore link AB.
3.On system B, accept the restored link.
T1 and D1 are read-write on A and read-only on B and C, and replication restarts on link AB.
4.On system C, restore link BC.
5.On system B, accept the restored link.
6.On system C, begin and complete data recovery on link BC.
When data recovery is complete, T1 and D1 are read-only on B and C. T2 becomes read-write on B and read-only on C, and replication resumes on link BC.
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