Howto: Create a new Logical Volume

Use vgdisplay to find available extents

lvcreate -L (size) -n (LV_name) (VG_name)
mkfs -F vxfs /dev/VG_name/LV_name

Edit /etc/fstab for new FS

mkdir /mountpoint
mount /mountpoint

Howto: Extend a Logical Volume

Use vgdisplay to find available extents

lvextend -L (size) /dev/VG_name/LV_name

If Online JFS is not installed

umount /mountpoint
extendfs -F vxfs /dev/VG_name/LV_name
mount /mountpoint

If Online JFS installed

fsadm -F vxfs -b (size in MB)m /mountpoint