If u got the below error

fsadm -b 1024M /home/user1
fsadm: /etc/default/fs is used for determining the file system type
fsadm: You don't have a license to run this program

1. # /usr/sbin/vxlicrep -e

Check the valid Liscense

2. # vxlicense -p vxlicrep

Check  the valid license from running server and install it on this server

License location : # /etc/vx/elm 

# ll /etc/vx/elm 

total 32
-rw-r--r--   1 root       sys            171 Nov  4 14:43 50.lic
-r--r--r--   1 bin        bin            291 Nov 14  2000 README

Copy the 50.lic file to the required server and install it

3. # vxlicinst -k 010449565889805115946465 (install the license)

4. # sbin/fs/vxfs/vxenablef -a (Enable that license)

Now u can try to extend the FS

  # fsadm -b 1024M /home/user1