- Adding Disks to a Disk Group
- Dropping Disks from Disk Group
- Replacing Disks in Disk Group
- Renaming Disks in Disk Group
- Resizing Disks in Disk Group
- Changing Diskgroup Attributes
- Undropping Disks in Disk Group
- Creating ADVM Volumes
https://onlinedbalearning.blogspot.com/2018/07/altering-asm-disk-groups.html