A question about checking partition size

thomas2004ch · 07-09-2010, 01:40 AM

I use df -h to list the partition size and I get:

Code:

[root@s003ap03 ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_root-lv_root
                      3.0G  2.1G  757M  74% /
/dev/sda1              99M   17M   77M  18% /boot
none                 1004M     0 1004M   0% /dev/shm
/dev/mapper/vg_root-lv_home
                      496M   67M  404M  15% /home
/dev/mapper/vg_root-lv_opt
                      2.5G  1.9G  455M  82% /opt
/dev/mapper/vg_root-lv_tmp
                      496M  117M  354M  25% /tmp
/dev/mapper/vg_root-lv_var
                      2.0G  485M  1.4G  26% /var

One can see the partiton '/opt' is 1.9 G in use.

Then I change to /opt and use 'du -h --max-depth=1' to list the detail and I get:

Code:

[root@s003ap03 opt]# du -h --max-depth=1
8.0K    ./jboss
199M    ./JIRA_TR
559M    ./JIRA_RU
40M     ./.cjournals
12M     ./.BackupExpressChangeJournal
2.4M    ./.BackupExpressJob
477M    ./BackEx
93M     ./netiq
16K     ./lost+found
1.4G    .

Here just show 1.4G in use. Where is the 500 MB?

druuna · 07-09-2010, 02:03 AM

Hi,

From the du manpage:

Quote:

`--max-depth=DEPTH'
Show the total for each directory (and file if -all) that is at
most MAX_DEPTH levels down from the root of the hierarchy. The
root is at level 0, so `du --max-depth=0' is equivalent to `du -s'.

--max-depth=1 is current dir plus one level down. The "missing" 500Mb is probably 2 or more levels down....

Hope this helps.

thomas2004ch · 07-09-2010, 02:24 AM

Quote:

Originally Posted by druuna

Hi,

From the du manpage:

--max-depth=1 is current dir plus one level down. The "missing" 500Mb is probably 2 or more levels down....

Hope this helps.

No matter what a max-depth I take, it is always 1.4G

druuna · 07-09-2010, 02:41 AM

Hi,

What do you see with the following command: du -ch

The c switch should also show a grand total. The command you gave only shows totals for individual directories (sorry I overlooked that the first time around).

Hope this helps.

thomas2004ch · 07-09-2010, 03:22 AM

Quote:

Originally Posted by druuna

Hi,

What do you see with the following command: du -ch

The c switch should also show a grand total. The command you gave only shows totals for individual directories (sorry I overlooked that the first time around).

Hope this helps.

Hi,

The du -ch shows a grand total. But at the end the sum is still 1.4G.

druuna · 07-09-2010, 11:34 AM

Hi,

Had some time to do a little search and came up with this: du vs df -- Huge difference (here at LQ).

Hope pixellany's answer helps.