4

I need to find out what's contributing to the disk usage on a specific filesystem (/dev/sda2):

$ df -h /
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda2              96G   82G  9.9G  90% /

I can't just do du -csh / because I have many other filesystems mounted underneath /, some of which are huge and slow:

$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda2              96G   82G  9.9G  90% /
/dev/sdb1             5.2T  3.7T  1.3T  76% /disk3
/dev/sda1              99M   18M   76M  20% /boot
tmpfs                  16G  4.0K   16G   1% /dev/shm
nfshome.XXX.net:/home/userA
                      5.3T  1.6T  3.5T  32% /home/userA
nfshome.XXX.net:/home/userB
                      5.3T  1.6T  3.5T  32% /home/userB

How can I retrieve disk usage only on /dev/sda2?

None of these work:

  • Attempt 1:

    $ du -csh /dev/sda2
    0       /dev/sda2
    0       total
    
  • Attempt 2:

    $ cd /dev/sda2/
    cd: not a directory: /dev/sda2/
    
  • Maybe I am missing something, but why doesn't the Used column give you what you are looking for? – StrongBad Apr 11 '17 at 13:44
6

Use the -x (single file system) option:

du -cshx /

This instructs du to only consider directories of / which are on the same file system.

0

There are two options to solving your problem:

Using the option --exclude which makes du ignore the given path.

du --human-readable --exclude=/home

Using the option --one-file-system would tell du to not go into a different file system.

du --human-readable --one-file-system /
  • I have home on a different partition but when I use `du -hd1x ` the home directory is included. I use debian stretch. What do I misunderstand in "one file system"? – user855443 Nov 26 '18 at 22:56

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