Linux missing disk space

Question

I have KVM vps with strange disk usage:

# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sdb              493G  1.2G  466G   1% /
tmpfs                 4.0G     0  4.0G   0% /dev/shm
/dev/sda1              96M   41M   51M  45% /boot

# du -sh /
du: cannot access `/proc/1633/task/1633/fd/4': No such file or directory
du: cannot access `/proc/1633/task/1633/fdinfo/4': No such file or directory
du: cannot access `/proc/1633/fd/4': No such file or directory
du: cannot access `/proc/1633/fdinfo/4': No such file or directory
1021M   /

How could it be? Where are ~20G of free space?

Could you please modify your output for the same units of measure? — Aaron Copley, Oct 04 '12 at 12:38
Run `du` with -x switch, this way it won't go into other file systems — Hubert Kario, Oct 06 '12 at 14:29

Sven · Accepted Answer · 2012-10-04T12:46:26.743

8

I guess you talk about the discrepancy between 493GB total space, 1.2G used and 466GB free. This is likely the result of the usual 5% of disk space that is reserved for root and not generally available.

To check for this, please add the output of at least the Reserved block count from

tune2fs -l /dev/sdb

to your question (provided you use ext3 or ext4 as a filesystem)

edited Oct 04 '12 at 12:46

answered Oct 04 '12 at 12:37

Sven

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Thanks, I think you are right, `Reserved block count: 6553600`. – cpt.Buggy Oct 04 '12 at 13:11

Linux missing disk space

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