Bacula-users

Re: [Bacula-users] Delay between end of despool and spooling again

2009-05-13 10:01:05
Subject: Re: [Bacula-users] Delay between end of despool and spooling again
From: "K. M. Peterson" <kmp.lists+bacula-users AT gmail DOT com>
To: Mattinson David <DPMATTINSON AT qinetiq DOT com>
Date: Wed, 13 May 2009 09:50:42 -0400
Dave,

A really interesting question this is.  I can't answer it.

But, I would ask you this: if the spooling time elapsed is near to the despool time, then why spool at all?

Our setup was set up originally with all jobs spooled (and we have the same Quantum Superloader/Drive that you do); I realized after 8 months that some of the jobs were able to acquire data quickly enough that they did not need to use spooling at all - and for those jobs, we dropped the backup time by over 50%.

_KMP

On Tue, May 12, 2009 at 10:20, Mattinson David <DPMATTINSON AT qinetiq DOT com> wrote:
Hi

I have installed Bacula-3.0.1 (gcc 3.4.3) on a Solaris 10 10/08 Sun
T5420 server with a Quantum Superloader DLT-S4 attached. postgreSQL
database.

I use a spool area of 5GB and the backup always progresses to normal
completion & no btape issues.

The normal sequence of events for a local 360GB data set involves
repeating

Spooling 5GB data 4-5 mins
Despooling 5GB data 5-7 mins

The period between the spooling ending message and spooling again varies
from next to nothing, which I would expect, and 33 minutes.  That is the
difference between

08-May 22:48 server-sd JobId 4044: Despooling elapsed time = 00:05:23,
Transfer rate = 16.23 M bytes/second

and

08-May 23:14 server-sd JobId 4044: Spooling data again ...

This is run when the server is otherwise quiet, but results in a backup
that I would expect to take less than 4 hours is close to 18, which
means I can't run it during the week.

Is there anything obvious I'm missing?

Dave
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