NS0-157 · Question #343
In clustered Data ONTAP 8.2, an aggregate by default is _________.
The correct answer is D. 64 bit, RAID DP, Snapshot reserve 0. Clustered Data ONTAP 8.2 introduced 64-bit aggregates as the default format, paired with RAID-DP for dual-parity protection and a 0% snapshot reserve at the aggregate level.
Question
In clustered Data ONTAP 8.2, an aggregate by default is _________.
Options
- A32 bit, RAID DP, Snapshot reserve 0
- B32 bit, RAID 4, Snapshot reserve 0
- C64 bit, RAID 4, Snapshot reserve 0
- D64 bit, RAID DP, Snapshot reserve 0
How the community answered
(30 responses)- B3% (1)
- C3% (1)
- D93% (28)
Why each option
Clustered Data ONTAP 8.2 introduced 64-bit aggregates as the default format, paired with RAID-DP for dual-parity protection and a 0% snapshot reserve at the aggregate level.
32-bit is the legacy format from older ONTAP releases; clustered ONTAP 8.2 defaults to 64-bit, making this combination incorrect.
RAID-4 provides only single-parity protection and has not been the default RAID policy since RAID-DP became standard, so this combination is incorrect.
RAID-4 is not the default RAID policy; ONTAP defaults to RAID-DP because dual parity protects against two concurrent disk failures, a critical requirement for large modern aggregates.
Clustered ONTAP 8.2 defaulted to 64-bit aggregates to support significantly larger capacities than 32-bit allowed. RAID-DP is the default RAID policy because it provides dual-parity protection against two simultaneous disk failures. The aggregate-level snapshot reserve defaults to 0% because snapshot space is managed at the volume level in ONTAP.
Concept tested: Default aggregate settings in clustered ONTAP 8.2
Source: https://docs.netapp.com/us-en/ontap/disks-aggregates/aggregate-creation-workflow-concept.html
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