To determine the current status of the largefiles flag:
# fsadm -V vxfs mount_point | special_device
To switch capabilities on a mounted file system:
# fsadm -V vxfs -o [no]largefiles mount_point
To switch capabilities on an unmounted file system:
# fsadm -V vxfs -o [no]largefiles special_device
You cannot change a file system to nolargefiles if it contains large files.
See the mount_vxfs
(1M), fsadm_vxfs
(1M), and mkfs_vxfs
(1M) manual pages.