When I login with root, and run "mkdir .ssh", the system says "No space left on device". But if I login with other user, it goes well.

[/root]df -h
Filesystem     Size    Used   Avail Capacity  Mounted on
/dev/da0s1a    496M    411M     45M    90%    /
devfs          1.0K    1.0K      0B   100%    /dev
/dev/da0s1e    496M     12K    456M     0%    /tmp
/dev/da0s1f     57G    878M     51G     2%    /usr
/dev/da0s1d    4.3G    215M    3.8G     5%    /var


[/root]mkdir .ssh

/: create/symlink failed, no inodes free
mkdir: .ssh: No space left on device