[CentOS] Re: HDD usage oddity
ugob at lubik.ca
Thu Nov 22 04:16:23 UTC 2007
Stephen Harris wrote:
> On Wed, Nov 21, 2007 at 07:37:31PM -0500, Ugo Bellavance wrote:
>> 2 of my Centos4 servers are showing weird behavior.
>> [root at server1 ~]# du -sh /var/
>> 1.8G /var/
>> [root at server1 ~]# df -h /var
>> Filesystem Size Used Avail Use% Mounted on
>> /dev/sda7 4.3G 3.9G 181M 96% /var
> There are two things to consider.
> If you have large block sizes and lots and lots of small files then
> "du" will report a number quite a lot smaller than "df". "df" reports
> on actually amount free; "du" reports on apparent size of the files used.
> If you delete a file that is still "open" (typically a log file, or
> a file being written to in /var/tmp) then Unix doesn't actually delete
> the file at that point; it removes the directory entry and marks the file
> to be deleted when no one is using it any more.
> I've seen developers create debug logs in /tmp that grew to 2Gb then
> delete them to save space... while the program was still writing more
> debug messages, so they didn't save any space at all.
That was it... I deleted a log that was still opened by syslog, and
other by snort.
After restarting snort and syslog, I got the right reading.
diskcheck will not stop bugging me :)
Thanks a lot!
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