Hi,

10.09.2007 00:40,, Ivan Adzhubey wrote::
> Hi,
> 
> Since the amount of data on our servers increased lately, I am thinking about 
> upgrading our hardware. We currently run Qualstar RLS-4445 autochanger with a 
> single Sony SDX-700C (AIT-3) drive installed. Autochanger has 4 vacant drive 
> slots and according to manufacturer supports AIT-3, AIT-4 and AIT-5 drives. I 
> am thinking about AIT-5 as a second drive and would appreciate any comments 
> on this model. Looks like both AIT-4 and AIT-5 tapes are about the same price 
> and with the latter having twice the capacity it makes sense to go for AIT-5 
> unless there are some reliability issues of which I am not aware. How good is 
> the current bacula version with multiple drives? I read that multiple drive 
> handling was mostly broken before 2.x.x,

Broken... no. Imperfect - yes :-)

Actually, as of 1.38, multiple autochangers *mostly* worked correctly. 
Since 2.2, most problems that can happen should be fixed.

> is it up to production level now?

I think so.

But note that having different drive types in one autochanger can 
limit you a bit. Bacula has no simple way to ensure that - in your 
case - AIT-3 drives are not used for AIT-5 tapes. This can be achieved 
by setting different Media Types, obviously, but I don't think the 
multiple-drive support is tested with such a setup yet.

As I haven't access to such a system, I never tried what happened, but 
I'm more or less sure you will encounter some problems. As far as I 
can tell, it would be best to ensure that your pools only contain 
media of one type.

Apart from that, I don't see any reasons why I, personally, wouldn't 
give it a try. Even if at first things don't work perfectly, I'd 
expect them to work smooth enough, and I'm sure Kern will try to work 
on any remaining issues as such a setup fits well to his ideas of 
"going enterprise" :-)

Arno

> Thanks,
> Ivan
> 
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-- 
Arno Lehmann
IT-Service Lehmann
www.its-lehmann.de

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