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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