Topic: [SOLVED] wrong disk space by "du"

[Jáder]

I'm sure this is a dumb question, but have found no answer to it after a day searching (maybe with wrong terms!), so here is the problem""
See this:

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[root@rinoceronte tmp]# df -kh
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/main-root
                      455G  434G     0 100% /
tmpfs                 1.9G     0  1.9G   0% /dev/shm
/dev/md0              239M   77M  150M  34% /boot

Why those USED and SIZE number are different (11GB) and USE% column show as 100% ??

The disk appears to be full, because this command show an error:

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[root@rinoceronte tmp]# mail -s "na CLI do Rinoceronte@`date`" someemail@somewhere.com</dev/null
Null message body; hope that's ok
[root@rinoceronte tmp]# qmail-inject: fatal: qq write error or disk full (#4.3.0)


[Stefano]

that's because of the reserved space to root, which is (default) set at 5%

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tune2fs -m 1 /dev/mapper/main-root

will set it at 1%
you can do it safely on a mounted running fs
in your case, I'd reboot the server after the edit to restart all the services
HTH

[Jáder]

That's a great info... will verify it later
THANKS... BUT, after a while, I returned to same console screen (still opened) and now?

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[root@rinoceronte tmp]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/main-root
                      455G  414G   18G  96% /
tmpfs                 1.9G     0  1.9G   0% /dev/shm
/dev/md0              239M   77M  150M  34% /boot
[root@rinoceronte tmp]# !mail
mail -s "na CLI do Rinoceronte@`date`" someemail@smewhere.com</dev/null
Null message body; hope that's ok
[root@rinoceronte tmp]#
So it fixed it by himself!!!WOW!

PS: 5% of 455GB = 22.75GB ...I was missing just 11GB!

[Stefano]

1) were you doing a backup?
2) 455-434=21

[Jáder]

Stefano,

Thanks by the math class! It's official now: I'm a moron! hehehe
I'm not sure if it was doing a backup, I'm sure I tryed to reboot server BEFORE post, just to be sure it would release all locked files, but not sure if it not started a backup again.

Anyways I tune2fs to 1% and got a few GB back .
Hope it not mess anything else in future!
It's a backup only server...hope do not use it NEVER EVER!

Regards

Jáder

[Jean-Philippe Pialasse]

maybe time to get him two more bigger drives and use raid to change them one after the other and grow your partitions.