Amanda-Users

Re: long estimate and run times

2003-06-18 16:57:28
Subject: Re: long estimate and run times
From: Jon LaBadie <jon AT jgcomp DOT com>
To: amanda-users AT amanda DOT org
Date: Wed, 18 Jun 2003 12:42:19 -0400
On Tue, Jun 17, 2003 at 03:23:32PM -0400, Jason Edgecombe wrote:
> Hi all,
> 
>  I'm trying to figure out why may backups and estimages take so long. I 
> have a dual-processor machine with 4GB RAM. / and /boot are two software 
> RAID1 drives 

I'd check the performance of this software raid.
I note in in this extracted part of your report:

                             DUMPER STATS
DISK          L    ORIG-KB    MMM:SS   KB/s
--------------- -----------------------------
/             3      50730     10:18     82.1
/home         0    3138930      6:29   8071.3
/usr/local    0    1135110      9:28   1997.6
/var/log      0     212930      0:23   9281.4
/www          0     239240      0:36   6579.7


Your local / dir only dumped 50 Meg of data (level 3) but at a speed of
just 82 KB/sec.  In contrast, your /home dumped 3 Gig of data in 2/3's
the time.

This dumping performance is probably magnified for the estimate phase
where 4 passes were made over the / file system to check the sizes
of level 0, 1, 2, and 3 deciding which to do.



-- 
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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