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Backingup larger files with TAR command

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# 1  
Old 04-08-2015
Backingup larger files with TAR command
I need to backup my database but the files are very large and the TAR command will not let me. I searched aids and found that I could do something with the mknod, COMPRESS and TAR command using them together. I appreciate your help.
# 2  
Old 04-08-2015
What do you mean it will not "let" you, what happens when you try?

What system are you on? tar often has compression built in, if you use the appropriate option, i.e. -z for gzip, -j for bzip2: tar -zcf file.tar.gz input files ...

What sort of data is it? Text compresses very well, other data depends on how structured it is.
# 3  
Old 04-08-2015
System AIX 7.1
The message : file too large
Type of date: Oracle datafiles

We have not enought space on disk and we can't grow it at this moment.
# 4  
Old 04-08-2015
Use a pipe to a compression program
Code:
tar cf - files ... | gzip -c >file.tar.gz

Last edited by MadeInGermany; 04-08-2015 at 04:59 PM.. Reason: -c
# 5  
Old 04-08-2015
We need to copy de files compressed to a tape. I don't know if the space on disk is enought for the compression process thats what I talk about MKNOD command. Using pipes the files are compressed and sent to the tape without left temporal files in server.
# 6  
Old 04-08-2015
mknod provides device nodes - certainly not useful here.
It seems this AIX tar cannot open files bigger than 2GB?
Then upgrade/patch it. If not possible, install GNU tar (gtar).
# 7  
Old 04-08-2015
Is it saying it can't create that large a file, or it can't open that large a file?

You can avoid temp files:

Code:
tar -cf - /path/to/files | gzip | dd of=/path/to/rewinding-tape-device

There is probably a more proper way to use tapes on AIX.
Last edited by Corona688; 04-08-2015 at 06:53 PM..
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