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.
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.
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.
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.
Regards,
=========================================================================
Heitor Medrado de Faria - LPIC-III | ITIL-F
Faltam poucos dias - Treinamento Telepresencial Bacula:
http://www.bacula.com.br/?p=2174
61 2021-8260 | 8268-4220
Site: www.bacula.com.br | Facebook: heitor.faria | Gtalk: heitorfa...@gmail.com
==========================================================================
----- Mensagem original -----
De: "Josh Fisher" <jfis...@pvct.com>
Para: bacula-users@lists.sourceforge.net
Enviadas: Quarta-feira, 19 de novembro de 2014 14:52:42
Assunto: Re: [Bacula-users] bacula can't make use of multi drives
On 11/19/2014 11:10 AM, hei...@bacula.com.br wrote:
Is it a bug that bacula cannot write to multiple drives for the jobs in the
same pool? Will there be a fix. Back in March 2014 Wolfgang Denk wrote "it can"
but how?
http://adsm.org/lists/html/Bacula-users/2014-03/msg00212.html
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.
<blockquote>
Regards,
=========================================================================
Heitor Medrado de Faria - LPIC-III | ITIL-F
Faltam poucos dias - Treinamento Telepresencial Bacula:
http://www.bacula.com.br/?p=2174
61 2021-8260 | 8268-4220
Site: www.bacula.com.br | Facebook: heitor.faria | Gtalk: heitorfa...@gmail.com
==========================================================================
</blockquote>
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