Amanda-Users

Re: Amanda Backup Strategy

2003-02-28 12:29:41
Subject: Re: Amanda Backup Strategy
From: Jon LaBadie <jon AT jgcomp DOT com>
To: amanda-users AT amanda DOT org
Date: Fri, 28 Feb 2003 10:50:53 -0500
On Wed, Feb 26, 2003 at 11:05:44AM -0500, Ralph Bearpark wrote:
> > Remember, you can always split up your 
> > filesystems into multiple disklist entries using tar.  Then you could 
> > reduce your tapelength to have *just enough* to fit everything once.
> 
> Hmm, dividing my clients into multiple DLEs that I hope will never exceed 
> 600MB ... that's an ugly concept.

I realize that 600MB is 18GB/30 days.  But you needed not set the tapelength
to 600MB.  'tapelength' is not a figure amanda tries to fill.  It is how
much it has to work with.  My tapelength is 12GB.  I average 5-6GB nightly.
But some nights it goes as low as 3GB and the occasional 10GB is seen.

Set your tapelength to some reasonable value, big enough for your large DLE's
plus some for incrementals.

As to those DLE's getting level 0's every other day;  I only recall similar
behavior under two conditions.  If the DLE is very active and level 0 or
level 1 would make little difference, or if the DLE is small and is one
that is promoted quite often to aid "future balancing" of large DLE's.
Because it is a small DLE, the impact is small also.  Is the behavior
of your frequently backed up DLE different?

-- 
Jon H. LaBadie                  jon AT jgcomp DOT com
 JG Computing
 4455 Province Line Road        (609) 252-0159
 Princeton, NJ  08540-4322      (609) 683-7220 (fax)

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