Disk usage at 107%

[Rajko Ray]

Pfsense 2.1.2
Packages: Never installed
Platform: VMware, 64-bit image

$ df -H
Filesystem        Size    Used  Avail Capacity  Mounted on
/dev/da0s1a    16G    16G  -1.1G  107%    /
devfs                1.0k    1.0k      0B  100%    /dev
/dev/md0        3.8M    51k    3.4M    1%    /var/run
devfs                1.0k    1.0k      0B  100%    /var/dhcpd/dev

I now reboot might fix it. Would like to know why it happens.

Thank you!

[dotdash]

Go to diagnostics, command and try du -d1 /
Maybe a package filling the disk?