gfdf - display disk free space of Gfarm file system
       gfdf [ -a ] [ -n ] [ -D domainname ]
       gfdf displays disk usage and free space of Gfarm file system.
       -a     Displays only summary information of the Gfarm file system.
       -n     Displays hostnames of available Gfarm file system nodes.
       -D domainname
              Specifies  a  domain name of filesystem nodes to list the status
              of disk free space.
       -?     Displays a list of command options.
       gfhost(1), gfarm2.conf(5)