What steps are required to increase the diskgroup capacity?

An ASM diskgroup that contains database tablespaces with six disks and normal redundancy is
nearing 90% capacity. You want to add additional capacity to the diskgroup. A set of six additional
disks has been made available, and appears as CANDIDATE disks in the V$ASM_DISK view.
What steps are required to increase the diskgroup capacity?

A.
Export the database objects.
Drop the diskgroup.
Create a new diskgroup.
Import the database objects.

B.
Shut down the database instances using the diskgroup.
Add the disks to the diskgroup.
Start the database instances using the diskgroup.

C.
Set the rebalance power limit (or allow it to default).
Add the disks to the diskgroup.

D.
Shut down all database instances and ASM instances.
Back up the ASM diskgroup.
Start the ASM instances.
Add the disks to the diskgroup.
Issue a rebalance command.
Start the database instances.

Explanation:
You can use the ADD clause of the ALTER DISKGROUP statement to add a disk or a failure
group to a disk group. The same syntax that you use to add a disk or failure group with the
CREATE DISKGROUP statement can be used with the ALTER DISKGROUP statement.
ASM automatically rebalances the disk group when disks are added. By default, the ALTER
DISKGROUP statement returns immediately after the disks have been added while the rebalance
operation continues to run asynchronously. You can query the V$ASM_OPERATION view to
monitor the status of the rebalance operation.
D60488GC11
Oracle 11g: RAC and Grid Infrastructure Administration Accelerated 8 – 21