Mr. Fisher: It's not just that. Eventually "Prefer Mounted Volumes = no" messes up the autochanger during a random backup and you have to restart storage daemon and sometimes powercycle the tape library.
I don't know if it is already fixed or if this error happens for all autochangers. But last Bacula System Community Storage whitepapers goes in the same way. Having 2 pools is still safer and more reliable way to do multiple volumes writing.
De: "Josh Fisher" <jfisher AT pvct DOT com>
Para: bacula-users AT lists.sourceforge DOT net
Enviadas: Quarta-feira, 19 de novembro de 2014 14:52:42
Assunto: Re: [Bacula-users] bacula can't make use of multi drives
It's not a bug, but just the way it's designed.
"Prefer Mounted Volumes=no" it's a directive that could
allow to write multiple volumes within the same pool at the
same time, however this is a little buggy and not recommended
at this time.
It's not a bug, but it is a little buggy??
I think that the only problem with setting "Prefer Mounted Volumes =
no" is that it will result in a lot of moving of a volume back and
forth between drives. While it might not be a bug, since it works as
advertised, it CAN be a problem. For tape, it will really slow
things down because it takes a substantial time to move a tape out
of one drive and into another. For disk virtual autochangers,
though, the moving between "drives" is simply closing a disk file
and then re-opening it, meaning that the delay is very negligible.
If there is some other issue, like a race condition that I am not
aware of, then that would indeed be a bug in my book. But I have
used PreferMountedVolumes=no for disk virtual autochanger without
(so far) encountering any such problems, just the swapping between
drives. And for disk virtual autochangers, I don't see that as a
problem in and of itself.
Regards,
=========================================================================
Heitor Medrado de
Faria - LPIC-III |
ITIL-F
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