On Tue, May 12, 2009 at 4:56 AM, John Drescher <drescherjm AT gmail DOT com> 
wrote:
>> I have installed Bacula Win 3.0.1 under Windows XP without problems.
>>
>> When i make a folder backup (size 190 Go on my hard disk), Bacula ask for a
>> second tape (tape one is full with 190,806,491,136 VolBytes).
>>
>> DltSage utility report : compression is on and 335 Gb are used.
>>
>> I have tried with "Minimum Block Size = 32768 Maximum Block Size = 32768",
>> the problem is the same.
>>
>> My DLT-V4 has the latest firmware (v10) and the latests windows drivers
>> (4.3.33).
>>
>> Can someone help me ?
>>
>
> That looks perfectly fine to me. I mean 190 GB is greater 160GB. You
> do realize that compression depends on the files you back up and if
> some of them are already compressed (.zip, .jpg ...) you will not get
> close to the often highly optimistic compression rate that
> manufacturers state. I expect 1.5:1 on average for drives that state
> 2:1.
>

Does your fileset contain a lot of compressed files? Does it contain a
lot of video or audio files?

John

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