View the Exhibit and examine the disk groups created at the time of migrating the database storage to Automatic Storage Management (ASM). Why does the FRA disk group initially have more free space eve

ASM dynamic rebalancing redistributes existing data across disks when the disk group membership changes and has no bearing on the total amount of free space available in a disk group.

An ASM disk group configured with EXTERNAL redundancy does not create mirror copies of extents, so 100% of raw disk capacity is reported as usable free space. In contrast, a DATA disk group configured with NORMAL redundancy consumes half the raw capacity to maintain a second mirror copy, resulting in the FRA group showing proportionally more free space even though both groups received the same raw disk allocation.

ASM disks are fully formatted and their headers are written when the disk group is created - all capacity is immediately accounted for and available, not deferred to a later formatting stage.

The allocation unit size governs I/O granularity and extent sizing within a disk group, but a uniform AU size across all disks in a group does not reduce the total reported free space relative to another group of the same raw capacity.