Reducing the size of a file system in your root volume group
The simplest way to reduce all file systems to their minimum size is to set the SHRINK option to yes when restoring the base operating system from backup.
The simplest way to reduce all file systems to their minimum size is to set the SHRINK option to yes when restoring the base operating system from backup. The SHRINK option and the following scenario cannot be used in tandem. If you set the SHRINK option to yes after doing the following procedure, the installation overrides your changes to the /image.data file.
This scenario leads you through a manual process to reduce the size of a selected rootvg file system. You will identify a file system that is not using all of its allocated disk space and then reallocate based on the amount of space the file system actually uses, thus freeing more space for the root volume group's use. As part of this procedure, you will back up your volume groups and reinstall the operating system, using the revised allocations.
The information in this how-to scenario was tested using specific versions of AIX®. The results you obtain might vary significantly depending on your version and level of AIX.
At this point, your /usr file system is resized, your root volume group has more free space, and your file systems are usable.