On Wed, 11 Jun 2008, bjoern_busch wrote:

>
> The tapes are HP-DDS3 125m tapes. Compressed 24GB and the box says assuming
> 2:1 compression rate. Maybe that's really the issue.

It is. The real capacity is 12Gb.

Try this:

tar Slcf - / | gzip -1 | wc

And see what's reported. Compare that with what df says is the amount of
disk space used. That will give you an idea of achievable compression.

If there are multiple mount points being backed up, add them to the tar
command. The "l" flag prevents wandering down different mounts (you really
don't want tar working in /proc, /sys, etc)

There are other ways of finding out what the compressed filesystem
capacity will be. Use what feels comfortable.

Older versions of btape used compressable data for the fill command.
Newer ones use incompressable data.


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