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NS0-157 · Question #151

The VLDB is out-of-quorum on the node serving as the master of the VLDB ring. Which four statements are true? (Choose four.)

The correct answer is A. A new VLDB ring master is elected. B. Clients can write to volumes on that node. C. Volumes cannot be moved to or from that node. D. Clients can read from volumes hosted on that node. This question tests understanding of how VLDB ring quorum loss on the master node affects cluster control-plane operations versus data-plane I/O in ONTAP.

ONTAP Cluster Fundamentals

Question

The VLDB is out-of-quorum on the node serving as the master of the VLDB ring. Which four statements are true? (Choose four.)

Options

  • AA new VLDB ring master is elected.
  • BClients can write to volumes on that node.
  • CVolumes cannot be moved to or from that node.
  • DClients can read from volumes hosted on that node.
  • ENew volumes can be created on aggregates hosted on that node.

How the community answered

(24 responses)
  • A
    58% (14)
  • E
    42% (10)

Why each option

This question tests understanding of how VLDB ring quorum loss on the master node affects cluster control-plane operations versus data-plane I/O in ONTAP.

AA new VLDB ring master is elected.Correct

When the VLDB ring master node loses quorum, the remaining healthy nodes in the VLDB ring automatically elect a new master to preserve VLDB operations across the rest of the cluster.

BClients can write to volumes on that node.Correct

The data path is independent of the VLDB control plane, so clients can continue performing write I/O to volumes hosted on the affected node - existing NFS/SMB sessions and block connections are not disrupted by VLDB quorum loss.

CVolumes cannot be moved to or from that node.Correct

Volume move operations require VLDB updates to register the new volume location; because the VLDB is out of quorum on that node, the cluster cannot commit volume location changes, preventing any volume moves to or from that node.

DClients can read from volumes hosted on that node.Correct

Read I/O to volumes hosted on the affected node continues uninterrupted because data access is handled by the data plane, which operates independently of the VLDB control-plane quorum state.

ENew volumes can be created on aggregates hosted on that node.

Creating a new volume requires inserting a new entry into the VLDB to register its location; since the VLDB is out of quorum on that node, this metadata write cannot be committed, so new volume creation on that node's aggregates is blocked.

Concept tested: ONTAP VLDB ring quorum loss impact on cluster operations

Source: https://docs.netapp.com/us-en/ontap/concepts/volumes-qtrees-files-luns-concept.html

Topics

#VLDB#quorum#ring master election#volume operations

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