Amanda-Users

Re: multiple gzip on same data!?

2005-06-29 12:41:31
Subject: Re: multiple gzip on same data!?
From: Jon LaBadie <jon AT jgcomp DOT com>
To: amanda-users AT amanda DOT org
Date: Wed, 29 Jun 2005 12:27:55 -0400
On Wed, Jun 29, 2005 at 09:57:48AM -0600, Graeme Humphries wrote:
> Hi guys,
> 
> I've got my configuration mostly sorted out now, so it's doing what I
> want it to. However, I've got a question about some weird behavior I'm
> seeing on my AMANDA server. I'm using the srvcompress option because the
> servers I'm backing up from are rather slow, and when backing up, I see
> the following on the AMANDA server:
> 
> 9675 ?        S      0:00  \_ /USR/SBIN/CRON
>  9676 ?        Ss     0:00      \_ /bin/sh /usr/sbin/amdump weekly
>  9685 ?        S      0:01          \_ /usr/lib/amanda/driver weekly
>  9686 ?        S      4:24              \_ taper weekly
>  9687 ?        S      0:59              |   \_ taper weekly
>  9699 ?        S      9:45              \_ dumper0 weekly
> 10629 ?        S     96:19              |   \_ /bin/gzip --fast
> 10630 ?        S      0:00              |   \_ /bin/gzip --best
>  9700 ?        S      6:52              \_ dumper1 weekly
> 10086 ?        S    149:32              |   \_ /bin/gzip --fast
> 10087 ?        S      0:21              |   \_ /bin/gzip --best
>  9701 ?        S      0:00              \_ dumper2 weekly
>  9702 ?        S      0:00              \_ dumper3 weekly
> 
> Now, why oh why is it doing *two* gzip operations on each set of data!?
> It looks like the gzip --best isn't actually getting that much running
> time, so is there something going on here that's faking me out, and it
> isn't *actually* gzipping everything twice? :)


A dump is two streams, the data being backed up and the index.
Each are separately gzipped.

-- 
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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