Which statement describes the behavior of 'aggr mirror aggrY' when run without the -m option?

Which statement describes the behavior of 'aggr mirror aggrY' when run without the -m option?

• A. The command mirrors to a specific disk
• B. Data ONTAP selects the disk drive
• C. The command creates a mirror without specifying a disk
• D. The command fails if no disk is specified

Answer: (B)

The key idea here is that disk placement for an aggregate mirror is automatic when you don’t pin a specific disk. Data ONTAP will pick a suitable disk to host the mirror, using its internal placement rules to choose a healthy, available drive (often a spare or an appropriate member disk) and to balance utilization and redundancy. The -m option exists precisely to force the mirror onto a particular disk, but omitting it leaves the decision to the system. This automatic selection is why selecting a disk automatically describes the behavior correctly. If there are no eligible disks, the operation would fail, but with available drives, the mirror is placed without you having to specify a disk.

The key idea here is that disk placement for an aggregate mirror is automatic when you don’t pin a specific disk. Data ONTAP will pick a suitable disk to host the mirror, using its internal placement rules to choose a healthy, available drive (often a spare or an appropriate member disk) and to balance utilization and redundancy. The -m option exists precisely to force the mirror onto a particular disk, but omitting it leaves the decision to the system. This automatic selection is why selecting a disk automatically describes the behavior correctly. If there are no eligible disks, the operation would fail, but with available drives, the mirror is placed without you having to specify a disk.