Andreas,

This really depends on your configuration. If you have only one drive 
head, you should set
"Maximum Concurrent Jobs = 6" (or any number your want)
in your job definitions. If you have multiple drive i/o heads, you have 
to also configure your job definition to prefer mounted volumes to 
non-mounted ones. Otherwise, bacula will mount as many tapes as heads 
you have and write to them simultaneously:
"Prefer Mounted Volumes = yes"

Multiplexing your backups to a single head can dramatically improve the 
write performance by aggregating simultaneous reads from slower devices. 
It can also introduce excessive wear on the drive head (shoe shine) if 
you don't balance your setup the right way. If you go this route, you 
might also want to consider spooling your backups to disk, then writing 
to tape all at once.


Good luck!
On 6/25/09 6:42 AM, Andreas Schuldei wrote:
> hi!
>
> reading the documentation i understand that you should have several
> volumes for concurrent backups, on different devices/directories. (i
> work on disk for now.)
>
> However some people here on the list seem to be doing well with
> concurrent backups to only one volume. is that actually true or am i
> misunderstanding something?
>
> if so, how do i do that? i would like a reciept for that. what bacula
> version is required for that?
>
> /andreas
>
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-- 
Nico Halpern
UNIX Systems Administrator
Wireless Generation
p: +1-212-796-2200 x5163 m: +1-646-300-1944
j: nhalpern AT im.wgen DOT net  aim: nhwgen

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