NS0-157 Question #321: Real Exam Question with Answer & Explanation

The correct answer is C: warn you that there are no available spares from the proper pool. When a mirrored volume's plex loses a disk and no spares exist in that pool, Data ONTAP issues a warning to the administrator without halting operations or crossing pool boundaries.

Data Protection and High Availability

Question

A mirrored volume has a failed disk, but there are no available spares in the pool from which the degraded plex was built. Data ONTAP will __________.

Options

Ahalt all operations to volumes in that pool
Bchoose spare disks to reconstruct from the opposite pool
Cwarn you that there are no available spares from the proper pool
D"halt" after 24 hours if spare disks are not added to the proper pool

Explanation

When a mirrored volume's plex loses a disk and no spares exist in that pool, Data ONTAP issues a warning to the administrator without halting operations or crossing pool boundaries.

Common mistakes.

A. Data ONTAP does not halt all volume operations when a plex is degraded - the volume remains online and accessible in a degraded state.
B. SyncMirror pool isolation rules prohibit ONTAP from using disks from the opposite pool to reconstruct a plex, as this would violate the architectural separation between pools.
D. Data ONTAP has no built-in 24-hour timer that triggers an automatic halt when spares are missing - it continues to warn without forcing a shutdown.

Concept tested. Data ONTAP SyncMirror degraded plex behavior

Reference. https://docs.netapp.com/us-en/ontap/disks-aggregates/mirrored-unmirrored-aggregates-concept.html

Topics

#SyncMirror#disk failure#spare disks#disk pools

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