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[Bacula-users] Antwort: Re: Antwort: Re: Antwort: Re: Large scale disk based backups
2009-04-29 05:54:07
Kevin Keane <subscription AT kkeane DOT com> wrote
on 29.04.2009 11:29:55:
> C.Keschnat AT internet-mit-iQ DOT de wrote:
> >
> > John Drescher <drescherjm AT gmail DOT com> wrote on 28.04.2009
17:01:11:
> >
> > > > Isn't the only way to backup to disks by emulating
tape drives? I'm
> > > > specifically
> > > > talking about
> > > >
> > http://sourceforge.net/docman/display_doc.php?docid=47704&group_id=50727
> > > > As I understand it, bacula itself doesn't support drives
other
> > than tapes.
> > > > Am I wrong?
> > > >
> > > You are completely wrong. Bacula supports, tape, disk/flash
and dvd.
> > >
> > > John
> >
> > I thought I read quite a lot of the documentation. Guess I'm
wrong.
> > Can you give me
> > a hint? I couldn't find anything except for the vchanger script
and
> > the default
> > bacula-sd.conf also has no Device resource for USB-Disks.
> You aren't completely wrong, actually, you just may have slightly
> misunderstood one of the basic concepts of Bacula. To Bacula, each
> volume is a tape regardless of how it actually is stored, and every
> device you specify in the SD is a tape drive regardless of what it
> physically is.
>
> Bacula *can* back up to hard disks, but it is a bit kludgy. For hard
> disk backups, Bacula uses one file per volume, and your USB drive
is
> treated like a tape drive. Now you and I know that you can't take
a
> single file out of a hard disk the way you can remove a tape from
a tape
> drive. Bacula doesn't know that, and you may at times get a message
to
> insert and mount a particular file that bacula wants.
>
> Similarly, you and I know that you can unplug a USB drive and take
it
> off site. But bacula doesn't know that, and assumes that all devices
are
> always available. You can work around these shortcomings with some
> clever scripting and scheduling, but to some extent you will have
to
> fight bacula to get it to do what you want.
>
> So: it is true that bacula CONCEPTUALLY only supports tapes. Physically,
> bacula does support hard disks and other media, though.
>
> Here is my SD definition for a USB disk.
>
> Device {
> Name = USBDisk2
> Media Type = File
> Device Type = File
> Archive Device = /misc/BACKUP2
> LabelMedia = yes
> Random Access = Yes
> AutomaticMount = yes
> RemovableMedia = no
> AlwaysOpen = no
> RequiresMount = No
> }
>
>
> --
> Kevin Keane
> Owner
> The NetTech
> Find the Uncommon: Expert Solutions for a Network You Never Have to
> Think About
>
> Office: 866-642-7116
> http://www.4nettech.com
Thanks for your reply, Kevin. I actually didn't misunderstand
the concepts, but John.
What you described is exactly what I have used on
my test system. But your right,
bacula doesn't really notice some things. Particularly,
when I have the wrong drive
connected, bacula tells me which drive to attach.
When I then attach and mount it,
the status of the job doesn't change, it still "waits
for appendable volumes". The
only solution I have found so far is to cancel the
job and start it again. I'm not
sure if I am doing something wrong or if it's bacula.------------------------------------------------------------------------------
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