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Re: [Bacula-users] LTO-3 tape Not Compressing data and speed
2011-01-20 03:39:45
The files are copied to tape files created by the bacula. Which are compressed:
Filset:
....
Include {Options {Signature = MD5; compression = GZIP5}
.....
What we have are two sets of backup:
1.-copied to hard disk files Bacula
2.-these same files copy them to tape.
To confirm you have everything I said, I will copy to tape uncompressed files. Really so certified the 417 GB is the maximum compression that allows.
The quality of the tapes, I have no way of knowing. The model I bought is brand Manufacturer: HP. The specific model is:
"HEWLETT-PACKARD C7973AN LTO" are packages of 20 LTO-3 tapes.
2011/1/18 Phil Stracchino <alaric AT metrocast DOT net>
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.
--
Jose Antonio Rodriguez Martin
CGI, S.A.
Teléfono: 607372465
skype: jarm-cgi
e-mail: jarodriguez AT cgi DOT es
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