Significant disk space usage discrepancy between df and du

From: Mark Schubert (Mark.Schubert@cogita.com.au)
Date: Wed Aug 06 2003 - 03:50:26 EDT


We have a V5.1 cluster which is showing significant discrepancies in
available disk space in one domain.

The following output from df -k shows /app as consuming 6.9GB. It also shows
the free space of the 2 filesets as being different, when usually all
filesets in a domain show the same free space. A du -k on /app shows it is
only consuming 3.4GB of disk space, a difference of 3.5GB from what df -k is
reporting. A du -k on /home shows 1.5GB consumed which is correctly reported
by df.

Filesystem 1024-blocks Used Available Capacity Mounted on
dom0#fset0 8838720 1599308 3703728 31% /home
dom0#fset1 8838720 6909931 1928789 79% /app

/etc/fstab contains the following for the file systems.
dom0#fset0 /home advfs rw 0 2
dom0#fset1 /app advfs rw 0 2

We recently did a verify -d on this domain to cleanup any unlinked files,
but that made no difference. Verify actually reported there were no unlinked
files.

I remember hearing something about quotas (or quotacheck) affecting the df
output, although we are not running quotas.

Any ideas?

Thanks,

Mark



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