NS0-157 Question #168: Real Exam Question with Answer & Explanation

The correct answer is A: disk to fail over between HA partners. Storage Failover (SFO) allows one node in an HA pair to take over the storage resources of its partner node during a failure or planned maintenance.

Question

What does Storage Failover Allow?

Options

Adisk to fail over between HA partners
Bdisk to fail over to a plex
Cdisk to fail over to any node in a cluster
Ddisk to fail over to the Epsilon node

Explanation

Storage Failover (SFO) allows one node in an HA pair to take over the storage resources of its partner node during a failure or planned maintenance.

Common mistakes.

B. A plex is a RAID-level concept representing a mirrored copy within an aggregate; disks do not fail over to a plex, which is not a node or controller entity.
C. Storage Failover is scoped specifically to HA partner pairs and does not allow disks to fail over to any arbitrary node in a cluster; cluster-wide disk mobility is a different and more limited concept.
D. The Epsilon node is a special designation used for quorum tiebreaking in a cluster and does not serve as a failover target for disk or aggregate resources.

Concept tested. Storage Failover HA pair disk takeover behavior

Reference. https://docs.netapp.com/ontap-9/topic/com.netapp.doc.dot-cm-hacg/GUID-storage-failover-overview.html

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