On Wed, Sep 03, 2008 at 11:59:49AM -0400, Ryan Novosielski wrote:
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> Chris Howells wrote:
> > Michael Galloway wrote:
> > 
> >> how does concurency work for tape libraries? can i use spooling and 
> >> concurrency?
> >> would that help? i've already got spooling job (2GB segments) and 
> >> attributes.
> > 
> > You can use concurrency with tape, yes. I write five concurrent jobs to 
> > LTO-4. (I have an autochanger, but it's only got a single LTO4 tape 
> > drive in it).
> > 
> > The bacula manual warns somewhat against using concurrent jobs with 
> > tape, but I've been using it for a year, every restore has been 100% 
> > perfect, and the restore speed is absolutely fine for my needs, it's 
> > pretty quick anyway.
> > 
> > I'm not sure about spooling as I don't use it but I understand it can 
> > help to increase restore speed, but as I said, I don't have a problem 
> > with restore speed anyway.
> 
> You should use spooling. I'm not 100% sure that interleaving should even
> be allowed, as I've heard of some people having strange things happening
> with it enabled. Also takes life off your tape head, if I'm not mistaken.
>

are there any recommendations on the size of the spool segment?

-- michael
 

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