Zitat von Nils Juergens <nils+bacula AT muon DOT de>:

> Hello Andreas,
>
> Am 20.08.2012 17:29, schrieb lst_hoe02 AT kwsoft DOT de:> As the tape is
> altering speed all the time with Bacula i would like to
>> know if there is a possibility to get closer to the dd values and what
>> could be the bottleneck in such a setup?
>
> for me (with LTO-3) increasing Maximum block size has had quite the
> impact on performance.
>
> Sadly, with the new setting I had trouble reading my tapes so switched
> back to the old configuration.
>
> I suspect you may get around the problem if you re-label all your tapes
> after switching the block size, however I have not testet this. Maybe
> someone can shed some light on the whole block size business? :-)

Would really nice indeed. As far as i understand the block size used  
as default (and max.) if nothing is specified is 64,512 Bytes. This  
looks a little bit low for high-speed tape and i'm not sure what the  
downside of higher values could be or why the manual state that there  
is no need to set it explicit (higher).
As i'm in the testing phase i will have a look if higher values lead  
to any trouble. Anyone aware why the default of 126*512 Bytes was  
choosen?

Regards

Andreas



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