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NS0-157 · Question #340

Select the following statements that are true about unplanned storage failover (SFO). (Choose all that apply)

The correct answer is C. The surviving partner assumes ownership of the failed partners aggregates D. The volume location database (VLDB) is updated with the new location of the aggregates and. During an unplanned storage failover, the HA partner takes ownership of the failed node's aggregates and the VLDB is updated to reflect their new location, but the failed node is not virtually hosted and data LIF migration is not guaranteed.

Data Protection and High Availability

Question

Select the following statements that are true about unplanned storage failover (SFO). (Choose all that apply)

Options

  • AThe "down" system is entirely virtually hosted by the HA partner and appears to be "up".
  • BThe data LIFs are always migrated to the HA partner
  • CThe surviving partner assumes ownership of the failed partners aggregates
  • DThe volume location database (VLDB) is updated with the new location of the aggregates and

How the community answered

(16 responses)
  • A
    6% (1)
  • B
    6% (1)
  • C
    88% (14)

Why each option

During an unplanned storage failover, the HA partner takes ownership of the failed node's aggregates and the VLDB is updated to reflect their new location, but the failed node is not virtually hosted and data LIF migration is not guaranteed.

AThe "down" system is entirely virtually hosted by the HA partner and appears to be "up".

The failed node is genuinely offline and is not virtually hosted by the HA partner - only its aggregates and volumes are taken over, and the node itself remains unavailable until it is repaired and rejoins the cluster.

BThe data LIFs are always migrated to the HA partner

Data LIF migration during unplanned failover depends on the LIF failover policy and port configuration; LIFs with a 'disabled' failover policy or lacking suitable home-node ports will not migrate, so migration is not guaranteed to always occur.

CThe surviving partner assumes ownership of the failed partners aggregatesCorrect

During unplanned SFO, the surviving HA partner automatically assumes disk and aggregate ownership from the failed node through the takeover process, allowing it to continue serving data from those aggregates without interruption.

DThe volume location database (VLDB) is updated with the new location of the aggregates andCorrect

After takeover, the Volume Location Database (VLDB) is updated to record that the failed node's aggregates are now hosted by the surviving partner node, ensuring clients and other cluster components can locate the data correctly.

Concept tested: NetApp ONTAP unplanned storage failover behavior and VLDB update

Source: https://docs.netapp.com/us-en/ontap/high-availability/ha-overview-concept.html

Topics

#storage failover#SFO#HA partner#VLDB

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