[root@node1 gfs]# df /gfs
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/mapper/vg0-gfs     581456        28    581428   1% /gfs
[root@node1 gfs]# dd if=/dev/zero of=./test bs=1M count=1
dd: writing `./test': No space left on device
1+0 records in
0+0 records out
0 bytes (0 B) copied, 0.00808917 seconds, 0.0 kB/s
[root@node1 gfs]#