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gzip is not working with the mknod command

Posted on 2004-08-10
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Last Modified: 2013-12-26
I am an oracle DBA and I am trying to compress my export file as the file is being created. I am trying to use the mknod command with the gzip command to compress the export file as it being created.  It appears as though I have everything setup correctly, but for some reason it does not compress the output file.  the output file is  "1 gig" in size.  Is there some sort of buffer that needs to be factored in.
/etc/mknod test.exp p
/usr/contrib/bin/gzip < test.exp > systest_exp &
nohup exp test/test1 parfile=/opt/backup/test.par
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Question by:dedean01
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by:griessh
ID: 11762962
Hi dedean01,

Questions:
Could you please elaborate on "does not compress the output file". What is the error? Does it create anything? Does it do anything?

A few things to check:

- Some versions of gzip can only deal with files < 2GB.
- Is there enough space on your file system (run 'df -k .')

======
Werner
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by:dedean01
ID: 11763436
/ :df -k .

/opt/backups           (/dev/vg01/lvol3       ) : 51034568 total allocated Kb
                                                  21013008 free allocated Kb
                                                  30021560 used allocated Kb
                                                        58 % allocation used

There is plenty of space on the filesystem and it does not give me an error.  If I use the gzip command without the mknod utility then it works fine.
"/usr/contrib/bin/gzip  test.exp"

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MikeOM_DBA earned 50 total points
ID: 11765153
Quote: - Some versions of gzip can only deal with files < 2GB.

A work-around is to use cat:

/etc/mknod test.exp p
cat text.exp|/usr/contrib/bin/gzip -c > systest_exp &
nohup exp test/test1 parfile=/opt/backup/test.par
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