NS0-157 · Question #331
Which two are true when creating a SyncMirror volume? (Choose two.)
The correct answer is C. The number of disks added must be an even number and equally divided between the two plexes. D. The disks are selected first on the basis of equivalent bytes per sector (bps) size, then on the basis. SyncMirror volume creation requires an even number of disks split equally across two plexes, with disk selection prioritizing equivalent bytes-per-sector size first.
Question
Which two are true when creating a SyncMirror volume? (Choose two.)
Options
- AThe disks selected for Plex 0 and Plex 1 must come from the same disk shelf.
- BThe disks selected for Plex 0 and Plex 1 must come from the same disk pools.
- CThe number of disks added must be an even number and equally divided between the two plexes.
- DThe disks are selected first on the basis of equivalent bytes per sector (bps) size, then on the basis
How the community answered
(23 responses)- A9% (2)
- B22% (5)
- C70% (16)
Why each option
SyncMirror volume creation requires an even number of disks split equally across two plexes, with disk selection prioritizing equivalent bytes-per-sector size first.
Plex 0 and Plex 1 disks should come from different physical disk shelves to provide the hardware-level redundancy that SyncMirror is designed to deliver.
Plex 0 and Plex 1 must draw disks from different disk pools (pool 0 and pool 1 respectively) to maintain pool-level fault isolation, not from the same pool.
SyncMirror mandates that the total number of disks be even so they can be divided equally between Plex 0 and Plex 1, ensuring both plexes maintain identical capacity and RAID layout. This equal division is a structural requirement of a mirrored aggregate.
Data ONTAP selects disks for SyncMirror plexes first by equivalent bytes-per-sector (BPS) size to ensure compatible disk geometries across both plexes, then applies secondary selection criteria. This ordering guarantees parity between the two plexes.
Concept tested: SyncMirror plex disk selection rules and requirements
Source: https://docs.netapp.com/us-en/ontap/disks-aggregates/create-mirrored-aggregates-task.html
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