Increasing the file system size

In many instances, the size of a file system needs to be increased because the
demand for storage has increased. In AIX, this is a common procedure, and it is
possible to do by using the chfs command, as in the following example:
# chfs -a size=+300000 /u/testfs
Filesystem size changed to 458752
This example shows how the file system testfs is extended with 300000 512-byte
blocks. When the file system is extended, the logical volume holding the JFS is
also extended, with the number of logical partitions that is needed to fulfill the
space request. If the system does not have enough free space, the volume group
can either be extended with an additional physical volume, or the size specified
for the chfs command must be lowered so that it matches the number of free
LPs.