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

The strange thing is really that in the one version of btape I can fill the
tape with ~15GB of data and in the other version I can fill the exact same
type with the full capacity, 24GB. And the data throughout changes.


Alan Brown wrote:
> 
> On Wed, 11 Jun 2008, bjoern_busch wrote:
> 
>> I took out the tape drive (HP SuperStore DAT24)
> 
> What is the native capacity of the tapes?
>  (Vs advertising-driven compressed capacity)
> 
> I find I only achieve 1.2:1 compression ratio on full backups, vs the 2:1
> or 3:1 used in advertsing figures.
> 
>> So I thought it's the tape. Different tape, same result. Maybe drive
>> dirty?
>> Cleaning cartridge, no difference. So I ran all those btape tests. Ran
>> fine.
>> I ran a fill in btape and the tape was full after ~15Gb. So I executed
>> tapeinfo, to see if compression was turned on. it was and still is.
>> Blocksize is set to 0.
> 
> Fill uses uncompressable data. perhaps 15Gb is close to the native
> capacity of your tape?
> 
> 
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