Logical volume resizing in one command, when the volume group have enough spaces.
AIX:
chfs -a size=+20G /data
Linux:
lvresize -L+20G /dev/vg_data/lvdata -r
The difference?
On AIX the resizing is done directly on the file system; but on Linux the resizing is done on the logical volume. The volume group have to be specified on Linux's LVM
