mount -t glusterfs -o direct-io-mode=off vikas-test01:/qa /mnt/fuse/
/usr/sbin/glusterfs: unrecognized option `--disable-direct-io-mode'
Try `glusterfs --help' or `glusterfs --usage' for more information.
Mount failed. Please check the log file for more details.

This is because in mount.glusterfs there is:

if [ -n "$direct_io_mode" ]; then
        cmd_line=$(echo "$cmd_line --disable-direct-io-mode");

Current command-line option for glusterfs is however:

--direct-io-mode[=BOOL]   Use direct I/O mode in fuse kernel module
                                             [default: "off" if big writes are supported, else
                                             "on" for fds not opened with O_RDONLY]