The System

  • An instance running on Amazon EC2
  • It is an m1.large EC2 instance
  • The instance is running Ubuntu Server 12.04 LTS

Here's What Happens...

To begin, let's execute the following:

root@host:~# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/xvda1      9.9G  6.6G  2.8G  71% /
udev            3.7G  8.0K  3.7G   1% /dev
tmpfs           746M  184K  745M   1% /run
none            5.0M     0  5.0M   0% /run/lock
none            3.7G     0  3.7G   0% /run/shm
/dev/xvdb       414G  199M  393G   1% /mnt

The output above tells us that 199 MB or 1% of /dev/xvdb (our ephemeral storage) is in use. However, the output of ls tells us the device is pretty much empty.

root@host:~# ls -lah /mnt
total 24K
drwxr-xr-x  3 root root 4.0K Nov 11 11:27 .
drwxr-xr-x 23 root root 4.0K May  1 15:57 ..
drwx------  2 root root  16K Nov 11 11:27 lost+found

What is consuming all the space?

Edit: Additional Information...

As advised in the comments below, here is the output of du -sch /mnt:

root@host:~# du -sch /mnt
20K     /mnt
20K     total

... and here is the output of mount:

root@host:~# mount
/dev/xvda1 on / type ext4 (rw)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
udev on /dev type devtmpfs (rw,mode=0755)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)
none on /run/shm type tmpfs (rw,nosuid,nodev)
/dev/xvdb on /mnt type ext3 (rw)
  • What's in lost+found? What's the size of that folder? – terdon May 6 '14 at 11:28
  • The output of ls -lah /mnt above says /mnt is 16K. – AlfaZulu May 6 '14 at 11:32
  • That does not include the size of the subdirectories. Please run du -sch /mnt/lost+found. – terdon May 6 '14 at 11:36
  • Ah. Nonetheless, du -sch /mnt/lost+found is reporting 16K also. – AlfaZulu May 6 '14 at 11:42
  • 1
    unix.stackexchange.com/questions/120311/… might have some useful information. – Gilles 'SO- stop being evil' May 6 '14 at 22:32

try du -hk /mnt to see the disk usage

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