mis-read disk space?

From: nm (c_n_nz_at_hotmail.com)
Date: 04/30/04 

Date: Fri, 30 Apr 2004 22:41:23 +1200

hi all, I am new to AIX so please forgive me.

 I have a volume that is labeled /opt it is only 131 meg.

I get an e mail from a script the sends me a text e mail with df and a whole
bunch of other info every 4 hours.

at 20:00 it said that /opt was at 47% full. it had been this way for weeks
if not months and never changed

Until last night at 00:00 it went to 100% used. I went in and did a du -sk
/opt/* and the disk space did not add up to 131 meg at all. far less. more
like that disk space it was reporting 4 hours earlier (47%) but sure enough
I did a manual df -k and it says 100% full. I am at a loss to explian this
or fix it. I have move some data off it and it sits at 96% full now.

can anyone help?

TIA

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