If online JFS is installed means
#swlist | grep -i "onlinejfs"
#bdf Filesystem
#fuser -cu <FS name>
Then reduce the Fs size first
#fsadm -F vxfs -b "new size in kb" "Mount Directory"
Ex: fsadm -F vxfs -b 1024 /test
Then reduce the lvol size also
#lvreduce -L "newsize in kb" /dev/vg01/lvolname
Ex: lvreduce -L 1024 /dev/vg01/lvol2
If online JFS not installed means
1. Backup all user data
#swlist | grep -i "onlinejfs"
#bdf Filesystem
#fuser -cu <FS name>
Then reduce the Fs size first
#fsadm -F vxfs -b "new size in kb" "Mount Directory"
Ex: fsadm -F vxfs -b 1024 /test
Then reduce the lvol size also
#lvreduce -L "newsize in kb" /dev/vg01/lvolname
Ex: lvreduce -L 1024 /dev/vg01/lvol2
If online JFS not installed means
1. Backup all user data
2. Umount the filesystem
#umount /home
3. Reduce the size
#lvreduce -L "size" /dev/vg01/lvolname
4. Re-create the filesystem
#newfs -F vxfs /dev/vg01/rlvolname
5) Mount the Logical Volume:
mount /dev/vg01/lvolname /mountdir
6) Restore the user data
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