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df falsely showing 100 per cent disk usage

`df` falsely says filesystem usage at 100%, and so do other applications whilst `du / -sh` shows an expected value.

Both are correct. The difference is that whenever an application has an
open file, but the file is already deleted, then it is counted in the df
output (because the space is certainly not free) but not in du (because
it is not being used by a file).

Just do a 'lsof | grep deleted' and I'm almost certain you'll see some
large file in /var/log being held open by some daemon that wasn't
restarted whenever it's logfile was rotated. Just restart that daemon
(and don't forget to fix the logrotate scripts for that daemon and/or
file a bugreport about it)

My first guess is you have deleted some files that are stil open. DU will
not show the deleted files, but since they are still in use DF will count
them.

 

Sure enough this was the case. I restarted mysql and the server returned itself to normal.

mickey ~ # lsof | grep deleted 
...
mysqld     5840  mysql    5w      REG       8,17 60305288765     212995 /data/log/mysql/mysql.log (deleted)

 

Comments

Httpd error log
this also helped me solve my disc problem. as i have deleted my error log log back but the disc always shows me full. so I restart the http service and the disc is usage moved from 100% to 5%.
Created 23/08/12
Perfect
Good jon on this command. Fixed my problem. Just restarted openvpn and boom back in business.
Created 09/01/13
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Author

Andrew Dodson
Since:Feb 2007

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