[Ocfs2-users] disk used discrepency between df -h & du -h

[sol beach]

   [oracle at rac01 dg]$ df -h
   8.5G    /u01
   34G     /u03
   170G    /u04
   35G     /u05
   16K     /u06
   [oracle at rac01 dg]$ df -h
   Filesystem            Size  Used Avail Use% Mounted on
   /dev/cciss/c0d0p5      22G  2.6G   18G  13% /
   /dev/cciss/c0d0p1      99M   18M   76M  19% /boot
   none                   16G     0   16G   0% /dev/shm
   /dev/cciss/c0d0p3      22G  153M   20G   1% /var
   /dev/sda1             547G  174G  374G  32% /u04
   /dev/sdj1             136G   35G  101G  26% /u03
   /dev/sdc1              18G   16G  3.0G  84% /u01
   /dev/sdd1             119G   36G   84G  31% /u05
   /dev/sde1             137G  1.1G  136G   1% /u06
   Please note that du -sh /u01 reports 8.5G used while df -h reports 16G
used
   Why the discrepancy & which is correct?
   BTW, all the volumes "u0*" volumes are OCFS2 volumes.
   In case it matters RHAS4 is the OS.
   Linux rac01.abc.com 2.6.9-78.ELsmp #1 SMP Wed Jul 9 15:46:26 EDT 2008
x86_64
   x86_64 x86_64 GNU/Linux
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