---------- Forwarded message ----------
From: John Drescher <[EMAIL PROTECTED]>
Date: Aug 23, 2007 5:30 PM
Subject: Re: [Bacula-users] Spooling and cincurrent jobs
To: Ivan Adzhubey <[EMAIL PROTECTED]>


On 8/23/07, Ivan Adzhubey <[EMAIL PROTECTED]> wrote:
> Hi John,
>
> On Thursday 23 August 2007 03:30:53 pm John Drescher wrote:
> > > "When data spooling is enabled, Bacula automatically turns on attribute
> > > spooling."
> >
> > That was just added last week as this is what happens in bacula 2.X and
> > above.
>
> No, the same text is already present in bacula.pdf for version 1.38.11 (rpm
> packager: D. Scott Barninger). In fact, none of the tips has changed since
> 1.38.
>
Well at least there was a discussion about improving the wording of
that part last week.

> I can't see how concurrent tape writes can possibly improve speed when data
> spooling to disk is enabled. Since all data are completely spooled to disk
> first, prior to engaging tape drives, despooling will be limited either by
> disk subsystem speed or tape drive speed (whichever comes the lowest). In
> either case the number of jobs despooled concurrently would not play any role
> in determining total rate of data transfer.

You may be correct. However, I am no expert on the spooling code so I
will have to pass on that one.

John


-- 
John M. Drescher

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