Which three events occur when a hub node fails in an Oracle Clusterware 12c Flex Cluster?
A.
The hub node is evicted from the cluster
B.
Leaf nodes connected to the failing hub node are reconnected to a surviving hub node without service disruption.
C.
Cluster resources running on leaf nodes connected to the failed hub node are relocated to one or more surviving hub nodes.
D.
Cluster resources running on leaf nodes connected to the failed hub node are relocated to one or more surviving leaf nodes.
E.
Cluster resources running on the failed hub node are relocated to one or more surviving hub nodes.
F.
Cluster resources running on the failed hub node are relocated to one or more surviving leaf nodes.
G.
Cluster resources running on the failed hub node are relocated to one or more surviving hub nodes or leaf nodes, or both.
Explanation:
Incorrect Answers:
F, G: Leaf Nodes are different from standard Oracle Grid Infrastructure nodes, in that they do not require direct access to shared storage, but instead request data
through Hub Nodes. Hub Nodes can run in an Oracle Flex Cluster configuration without having any Leaf Nodes as cluster member nodes, but Leaf Nodes must be
members of a cluster that includes at least one Hub Node. https://docs.oracle.com/database/121/CWADD/bigcluster.htm#CWADD92409
I think A,E,F
If a Hub Node fails:
– The node is evicted from the cluster
— Services are relocated to other Hub Nodes if possible.
– Corresponding Leaf Nodes are also evicted from the cluster
— Services are relocated to other Leaf Nodes if possible.
• If a Leaf Node fails:
– The node is evicted from the cluster
— Services are relocated to another Leaf Node if possible.
– The impact of the failure is contained if possible
I don’t think F is correct: services running on a hub node are never relocated to a leaf node. These services are relocated to other leaf nodes if possible.
For me, the correct answers are A, D & E
I think A,D,E is correct
I don’t think that “D” is correct, the question is about a hub node and not about leaf node!
So “C” and “D” is wrong!
“F” and “G” is wrong as you said
For me, the correct answers are “A”, “B” & “E”
A B E are true
Check http://allthingsoracle.com/oracle-flex-cluster-leaf-node-failover/
ABE are the correct options
Per training material (as Ziad posted)
If a Hub Node fails:
– The node is evicted from the cluster
— Services are relocated to other Hub Nodes if possible.
– Corresponding Leaf Nodes are also evicted from the cluster
— Services are relocated to other Leaf Nodes if possible.
The last two lies says Leaf Nodes are evicted and Leaf Notes’ services are relocated to other Leaf Notes if possible.
ADE
Agree!