Bacula-users

Re: [Bacula-users] LTO-3 tape Not Compressing data and speed

2011-01-18 10:03:56
Subject: Re: [Bacula-users] LTO-3 tape Not Compressing data and speed
From: Phil Stracchino <alaric AT metrocast DOT net>
To: bacula-users AT lists.sourceforge DOT net
Date: Tue, 18 Jan 2011 10:00:47 -0500
On 01/18/11 02:24, Jose Antonio Rodriguez Martin wrote:
> Nothing, it still does not copy more than 417 GB ...

If you're getting 417GB onto a 400GB tape, you're getting compression.
You're just not getting MUCH of it.

What kind of data are you backing up?  Not all data compresses well.
English text compresses about 4:1 on average.  Binaries, typically not
much at all.  Digital images, digital video, zip archives, MP3 audio?
Forget it.  Databases?  Sometimes you get lucky and get 10%-15%
compression, sometimes they don't compress at all.


-- 
  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, Free Stater
                 It's not the years, it's the mileage.

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