[SDBUG] How to fill my tape to see how many data can i write to him?

[Pedro Moreno]

I understand your point. I forget about the compression they use.

   My files are mixed: binaries, image, video, text, zip, rar, database 
files(access, pervasive), autocad files.

Well it seems that i reach my limit, i need to do something.

  Thanks a lot Michael for your explanation.

Michael J McCafferty wrote:
> Pedro,
>
> According to 
> http://h18006.www1.hp.com/products/storageworks/ultrium232/index.html 
> that drive has a compressed capacity of 200G. That is a back of the 
> envelope calculation that the marketing department strong-armed an 
> engineer to give them once upon a time. It's double the uncompressed 
> number, which is the "real" number of 100G uncompressed. The 200G 
> number is estimated for marketing purposes. Every backup tape/drive 
> maker uses the same 2x uncompressed number.
>
> It depends on what kind of data you are backing (how compressible it 
> is), but 180G is probably a good number for a real world backup to a 
> tape that is marketed with a capacity of 200G compressed. Large text 
> files compress very well but data that is already compressed will not 
> (ie: JPG, GIF, WMV, anything .gz, .tgz, .zip or .Z), compiled binaries 
> usually don't compress well either.
>
> How do you write data to a tape to see if it fits 200G ? Well, if you 
> write any other data other than the data you already wrote to it, the 
> number will be different. The tape itself actually only fits 100G, but 
> it was compressed to get the 180G on there.
>
> Mike
>
>
> At 02:16 PM 5/28/2007, you wrote:
>
>>  Hi people.
>>
>>     I have 1 tape HP storage-works 232, i want to know how can i 
>> write data to the tape and see how much data can freebsd write to my 
>> tape? Not using bacula commands just Unix commands.
>>
>>     It supposes that supports 200GB, but i have problems with bacula 
>> and i want to know if is bacula or freebsd. Bacula says that "Tape 
>> Full" but calculating each client space, i only need 180GB, then why 
>> is telling me that the tape is full.
>>
>>     How you could point me how to test my device, thanks all for your 
>> time!!!
>>
>> P.S. FreeBSD 6.1-p16 Bacula 1.38.11 MySQL 4.1.
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>
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