On Mon, Jul 03, 2006 at 09:34:24AM +0200, Cyrille Bollu wrote:
> Jon LaBadie <jon AT jgcomp DOT com> a écrit sur 30/06/2006 15:47:24 :
> 
> > > Sorry for asking but, why do you say backuping directly to tape is 
> slow?
> > > 
> > > I guess he's doing local backups (ie: The 700GB are not sent over the 
> > > network every full backups).
> > > 
> > > In this configuration what would be the benefit of having an holding 
> disk?
> > > 
> > 
> > See my note about his writing 80000 tiny tape files.
> > 
> 
> This is correctly handled by Amanda when the "holdingdisk no" variable is 
> set:
> 
> Here's an extract from one of my amanda report:
> 
>  taper: tape daily-backup04 kb 181855648 fm 23 [OK]
> 
> (with 23 DLE)
> 

But, you are not trying to put 700GB from one DLE onto your
200GB tapes as Paul G was.  That would require the tape spanning
options and would cause amanda to write more pieces than there
are DLE's.  In that situation the interactions of holding disk
and tape spanning buffering are not the same as when you
are not using tape spanning at all.

-- 
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)