1Z0-078 practice question 3 of 15

Which three statements are true about the Oracle Clusterware 19c Flex Cluster architecture? (Choose three.)

Full set: 77 questions

Answer options

A: Each hub node must be connected to storage shared across all hub nodes. Correct answer

B: Each leaf node must be connected to storage shared across all cluster nodes.

C: Each leaf node must be connected to storage shared across all leaf nodes.

D: Leaf nodes require direct access to the voting disks.

E: Hub nodes require direct access to the OCR file. Correct answer

F: Hub nodes require direct access to the voting disks. Correct answer

Correct Answer:

A. Each hub node must be connected to storage shared across all hub nodes.; E. Hub nodes require direct access to the OCR file.; F. Hub nodes require direct access to the voting disks.

Explanation

In a Flex Cluster, hub nodes function like traditional cluster nodes: they run Clusterware, access shared storage, and hold the voting disks and OCR. Therefore every hub node must see the common shared storage, and each hub node must have direct access to both the OCR and the voting files. Leaf nodes obtain required metadata through their associated hub node and never access shared storage directly.

Why Incorrect

B. Leaf nodes have no direct connection to any shared storage; they access it only through hub nodes.
C. Same reason as B; no leaf-to-leaf shared-storage requirement exists.
D. Voting disks are located on storage only hub nodes can access; leaf nodes do not see them.

References

1. Oracle Clusterware Administration and Deployment Guide 19c, Sec. 2.3.3 “Oracle Flex Clusters—Hub and Leaf Nodes” (Doc ID F15640-07).

2. Oracle Clusterware Admin Guide 19c, Sec. 5.2 “Oracle Clusterware Files (OCR and Voting Files)”—requires direct storage access only for hub nodes.

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