Zitat von Tomasz Rozycki <rozycki.tomasz AT gmail DOT com>:

> I've exactly that tape
> http://www8.hp.com/uk/en/products/storage-media/product-detail.html?oid=27557
> and accoring to description = LTO-1 should have 200GB.
> So could you explain me if we talk about capacity of tape or capacity of
> bacula if you mean "100GB native capacity" ?

The marketing offers you a capacity calculated by estimate 2:1  
compression ratio. So you have 100GB capacity but they claim 200GB  
will fit because of compression. There is no magic compression so you  
can test yourself how the actual ratio of your data is. Already  
compressed or encrypted data can not be further compressed so the  
ratio in this case is more of 1:1.

The real specs are hidden here:
http://h20195.www2.hp.com/v2/GetDocument.aspx?docname=4AA4-2010EEE&doctype=brochure&doclang=EN_GB&searchquery=&cc=uk&lc=en


> I don't know what exactly mean "bloated data"?

Bloated data is data which much redundancy like uncompressed tif html  
or text files. With this you will get a good compression ratio. With  
jpeg and the like further compression is not useful at all.

Regards

Andreas



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