Well, I guess I don't like the answer, but I will have to accept that... i
would have rather heard, I'm just an idiot and there is a fix :)

So I guess 1.29 btape uses compressable data then and 1.36 already
uncompressable :(

Well, I'll have to see then, if 2 tapes for one full backup are acceptable.

Thanks for your help and advice!


Alan Brown wrote:
> 
> 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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