On 07/25/11 11:13, John Drescher wrote:
> On Mon, Jul 25, 2011 at 11:06 AM, Rickifer Barros
> <rickiferbarros AT gmail DOT com> wrote:
>> I did this before....but, I didn't know how check in Debian if it really is
>> being compressed by the tape drive. The only thing that I got was the bacula
>> information about the SD and FD Written and the "mt" command in Linux don't
>> say me the real data size of the volume, so I chose to trust on the software
>> compression...YEAH I'm noob on Tape manipulation...  :t
>>
> 
> Just fill a tape with bacua. Then look at its status bacula will tell
> you how much data has been written to the tape. If this amount is >
> than the tape's native size compression is on. Remember the tape drive
> compresses data at 120 MB/s while software compression you will be
> lucky to get 1/10 that if you have a 4 GHz processor.

mt can both get and set options including compression.  It's all in the
man page.


-- 
  Phil Stracchino, CDK#2     DoD#299792458     ICBM: 43.5607, -71.355
  alaric AT caerllewys DOT net   alaric AT metrocast DOT net   phil AT 
co.ordinate DOT org
  Renaissance Man, Unix ronin, Perl hacker, SQL wrangler, Free Stater
                 It's not the years, it's the mileage.

------------------------------------------------------------------------------
Storage Efficiency Calculator
This modeling tool is based on patent-pending intellectual property that
has been used successfully in hundreds of IBM storage optimization engage-
ments, worldwide.  Store less, Store more with what you own, Move data to 
the right place. Try It Now! http://www.accelacomm.com/jaw/sfnl/114/51427378/
_______________________________________________
Bacula-users mailing list
Bacula-users AT lists.sourceforge DOT net
https://lists.sourceforge.net/lists/listinfo/bacula-users