Wierd File Sizes....

All,

This is peculiar behavior I've never noticed before and was wondering if
anyone else has experienced this.  I've created a file using mmap, set its
size to the appropriate bytes, and then written it. As you can see in the
listing below the file size is 156K, but du -k only sees 7K.  What's not
below is if I use df -k it sees 7K less than before the file was created.

Another wierd thing was that I ran this application last night on some very
large files and it created a 200MB index / df -k said I only had 160MB
before the file was written. du -k said the file was only a few 100K.

As you can see below by using gzip / ungzip the file gets noticed properly.

Anyone have any ideas about this bizarreness?

Dave-


Bauhaus:index> ls -la
total 13
drwxrwxr-x   2 davep    davep        5120 Jun 10 08:42 .
drwxrwxr-x   3 davep    davep        6144 Jun 10 08:42 ..
-rw-------   1 davep    davep      156418 Jun 10 08:42 index.256
Bauhaus:index> du -k
7       .
Bauhaus:index> gzip index.256 
Bauhaus:index> ls -la
total 76
drwxrwxr-x   2 davep    davep        5120 Jun 10 08:44 .
drwxrwxr-x   3 davep    davep        6144 Jun 10 08:42 ..
-rw-------   1 davep    davep       65142 Jun 10 08:42 index.256.gz
Bauhaus:index> du -k
70      .
Bauhaus:index> gunzip index.256.gz 
Bauhaus:index> ls -la
total 165
drwxrwxr-x   2 davep    davep        5120 Jun 10 08:44 .
drwxrwxr-x   3 davep    davep        6144 Jun 10 08:42 ..
-rw-------   1 davep    davep      156418 Jun 10 08:42 index.256
Bauhaus:index> du -k
159     .
Bauhaus:index> 


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