How to increase size of a Disk Group in ASM?

Hi,
I'm testing the ASM in AIX. I created a Logical Volume with size is, e.g., 10G. Then I assign this LV with a Disk Group in ASM. Now I increase the size of the LV using AIX's smit, e.g., to 20G. How can I increase the size of my Disk Group in ASM?
I understand that Oracle recommend to assign a whole physical hard disk to a Disk Group in ASM.Thus, the resize command of ASM can only reduce the size of Disk Group, but cannot increase the size of it?
Any advice?
Pham

Disk Group is a logical term, phyical size of a diskgroup is determined by the disks belonging to a diskgroup. So you cannot increase a diskgroup, only the disks in it. You can resize a disk up to its physical limit (resize option of ALTER DISKGROUP statement).
Werner

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