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Problems with DU and DF


From: Randy
Subject: Problems with DU and DF
Date: Wed, 07 Feb 2001 17:04:08 -0500

Hi

I have a Linux RH5.2 server running and I am having a slight problem understanding the results of du and df commands. Disk space is at a premium for us at the moment so I check periodically via df to determine whether I need to go in an trim a few web accounts of stray "carts" or the various server logs.

While df will show the disks getting full, I use du to determine which files need truncating. Once located I will either truncate them or just remove them via the rm command. However, after removing 150 - 200 megs of log files a df command does not show the correct free space on the filesystem.

If, for example, I have a filesystem mounted as /var with log files being written on it and a df shows 95% used and I delete 200 megs of files the df will still show 95% full for many days. Is there anyway to force it to 'reset' or 'reread' the filesystem and get the correct numbers? If I add a file, no matter what size, a df will show it immediately.. the problem is only with removing them. Or am I just removing them incorrectly?

Running du -s /var always seems to show what I would consider the correct space used and changes proportionately with the sizes of the files removed.

Thank you for your time...
Randy Coleman




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