I have Ubuntu machine, version 14.04 running on AWS (EC2).
Yesterday, my disk space run out of space.
Running with user root

```
df -h

```

Bring this result:

```
Filesystem      Size  Used Avail Use% Mounted on
/dev/xvda1      148G  142G  106M 100% /
none            4.0K     0  4.0K   0% /sys/fs/cgroup
udev            3.7G  8.0K  3.7G   1% /dev
tmpfs           748M  332K  748M   1% /run
none            5.0M     0  5.0M   0% /run/lock
none            3.7G     0  3.7G   0% /run/shm
none            100M     0  100M   0% /run/user
overflow        1.0M   32K  992K   4% /tmp

```

But running this command:

```
du -ch /

```

Gave this result:

```
....
1.5G    /
1.5G    total

```

Reboot gave save results.
This morning, when I came back to the office AND NO ONE TOUCH THE MACHINE (and there is no batch tasks or processes that write and / or delete files), I run again the commands. I got:

```
Filesystem      Size  Used Avail Use% Mounted on
/dev/xvda1      148G  1.6G  140G   2% /
none            4.0K     0  4.0K   0% /sys/fs/cgroup
udev            3.7G  8.0K  3.7G   1% /dev
tmpfs           748M  332K  748M   1% /run
none            5.0M     0  5.0M   0% /run/lock
none            3.7G     0  3.7G   0% /run/shm
none            100M     0  100M   0% /run/user
overflow        1.0M   32K  992K   4% /tmp

```

Which make much more sense.

Anyone has explanation why this happened? and why after a night space was free?

Please note that I saw the used disk space grow steadily. And it is the third time it happens.