When can a high availability disaster recovery (HADR) role switch operation be performed in a
DB2 pureScale environment?
A.
When crash recovery is occurring on the standby cluster.
B.
When all the log streams are in peer or assisted remote catchup state.
C.
When the primary database is not connected to the standby database.
D.
All the log streams are in remote catchup state and the synchronization mode is NEARASYNC.
Role switch
After a role switch, which is initiated by issuing the TAKEOVER HADR command from any standby member, the standby cluster becomes the primary cluster and vice versa. Role switch helps ensure that no data is lost between the old primary and new primary. You can initiate a role switch in the following circumstances only:
Crash recovery is not occurring on the primary cluster, including member crash recovery that is pending or in progress.
All the log streams are in peer or assisted remote catchup state.
All the log streams are in remote catchup state or in assisted remote catchup state, and the synchronization mode is SUPERASYNC.
https://www.ibm.com/support/knowledgecenter/en/SSEPGG_10.5.0/com.ibm.db2.luw.admin.ha.doc/doc/c0061129.html
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