Amanda-Users

Re: tar dumps, performance

2007-08-08 10:55:47
Subject: Re: tar dumps, performance
From: Jon LaBadie <jon AT jgcomp DOT com>
To: amanda-users AT amanda DOT org
Date: Wed, 8 Aug 2007 10:30:34 -0400
On Wed, Aug 08, 2007 at 09:10:58AM -0500, Dustin J. Mitchell wrote:
> On Wed, Aug 08, 2007 at 09:09:50AM -0400, Brian Cuttler wrote:
> > What really happens when GTAR INDEXING is enabled ?
> 
> Briefly, the client 'tees' the tar output to another invocation of tar
> with the -t (table of contents) option, which lists each file in the
> dump, one per line.  That information is sent to the server in a stream
> parallel to the data stream, where the dumper writes it to the gnu-tar
> index files directory, possibly compressing it first.
> 

I would not expect indexing to have a significant impact
on backup time.  But I've been wrong before :(

jl
-- 
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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