On 01/05/11 10:45, John Drescher wrote:
>> Is there any way I can test the full capacity of tape with compression?
>>
> 
> That question does not make total sense. I mean compression is
> dependent on the data you supply. On one tape you can get 5:1 on a
> second tape you can get 1.1:1 depending on your data. For me I average
> 1.5:1 compression. And that seems to be the expectation even though
> the standard claims the overly optimistic 2:1.

All tape drive marketing claims assume 2:1 overall compression.  My
experience is that with my real-world data set, I get about 15%
compression overall, i.e about 230GB on a 200/400GB LTO2 tape.


-- 
  Phil Stracchino, CDK#2     DoD#299792458     ICBM: 43.5607, -71.355
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         Renaissance Man, Unix ronin, Perl hacker, Free Stater
                 It's not the years, it's the mileage.

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