If your IBM® System p® AIX® hosts use AIX 5.2 or a later AIX operating system version, the SAN Volume Controller supports the ability to dynamically increase virtual disk (VDisk) size.
The chvg command options provide the ability to grow the size of a physical volume that the Logical Volume Manager (LVM) uses, without interruptions to the use or availability of the system. Refer to the AIX publication System Management Guide: Operating System and Devices for more information.