Re: [Bacula-users] Bacula configration for FC LTO-5 tape drive

Subject:

From:

Arunav Mandal <dibun AT hotmail DOT com>

To:

Date:

Wed, 5 Jan 2011 23:31:15 +0100

Is deduplication possible in Bacula.

Arunav.

> Date: Wed, 5 Jan 2011 15:28:20 -0500
> From: alaric AT metrocast DOT net
> To: bacula-users AT lists.sourceforge DOT net
> Subject: Re: [Bacula-users] Bacula configration for FC LTO-5 tape drive
>
> On 01/05/11 15:11, Arunav Mandal wrote:
> > Very true, in real world data is so different that compression ratio is
> > different. Is there any easy way to find out how much data is stored per
> > tape?
>
> The Media or Pools view in bat (for one easy way to access it) will show
> you the exact amount of data written to any volume, which in the case of
> tape hardware compression will be the data amount before compression.
> As noted elsewhere, I'm typically seeing around 230GB on an LTO2 tape.
>
> (It should be noted in fairness that by far the majority of the backup
> set on my NAS server is already-compressed data such as digital audio
> and video.)
>
> The way LTO compression works, the tape drive compresses each block on
> the fly, then writes to tape whichever is the *smaller* of the raw or
> the compressed block, flagging it accordingly.
>
>
> --
> 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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