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Re: [Bacula-devel] Trying out the virtual disk changer feature.


On Friday 17 October 2008 17:37:00 Graham Keeling wrote:
> Hello,
> Going back a couple of months, there was this short exchange:
>
> On Fri, Aug 15, 2008 at 10:49:50AM +0200, Kern Sibbald wrote:
> > On Friday 15 August 2008 10:36:36 Graham Keeling wrote:
> > > It would be nice if it did let you read/write to the same storage if it
> > > were possible - as it is in my case, as I am exclusively using
> > > disk-based storage.
> >
> > Unfortunately it is not possible to read and write to the same device,
> > because on a tape it is just impossible, and on a disk, it requires two
> > I/O packets.
> >
> > The above said, it is possible to read and write to the same disk
> > directory providing the volumes are different.  This is most easily
> > accomplished by using something such as the virtual disk changer
> > (disk-changer script), which provides two or more virtual drives.  It is
> > probably also possible by using the virtual disk device, which is a sort
> > of automatic disk changer, but I don't use that code, so I hesitate to
> > recommend it.
>
> I've been trying to get the disk-changer script to work for me, looking at
> the virtual backup regression tests for clues.
>
> Unless I'm wrong, it seems that you can't just schedule jobs and let it get
> on with it, filling up the slots with data and switching between them, as
> you have to manually enter commands to load, unload and label the slots.

No, it is totally automatic.

>
> I've also tried to find out what you mean by 'the virtual disk device', but
> I'm not able to find anything. Is there any documentation about this
> anywhere?

At the top of the disk-changer script.

>
> Thanks for any help,
> Graham.
>
>
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