The SAN Volume Controller supports the ability to dynamically expand the size of a virtual disk (VDisk) if the AIX® host is using AIX version 5.2 or later.
The chvg command options provide the ability to expand the size of a physical volume that the Logical Volume Manager (LVM) uses, without interruptions to the use or availability of the system. See the AIX System Management Guide Operating System and Devices for more information.