On Tuesday 18 July 2006 18:21, Dan Horne wrote:
> > What happens if you define an autochanger resource and make
> > the two drives part of an autochanger? Even though there is
> > no _true_ autochanger, it seems to me that the logic would be
> > there to make it do what you want.
>
> I don't see how this would work, since an autochanger is a single
> physical device (eg: /dev/nsa0) whereas the two tape drives are two
> separate physical devices (/dev/nsa0 and /dev/nsa1). The autochanger
> setup would just send a signal to the single device to insert a new
> tape, but I need to be able to overflow onto a second physical device.
No, it cannot work as you suggest. There are two possible solutions that I
know of:
1. There are two scripts in the examples directory that do more or less what
you want each one works differently.
2. It could be possible to modify the disk-changer script in the scripts
directory to work with tape drives rather than disk volumes. The same
techniques apply, and that is probably how the scripts in examples works.
>
> >From what I can see, this can't be done currently. Logically, it seems
>
> that in order for this to work, bacula would need a new resource type in
> the Storage Daemon config. Possibly a "DevPool" resource. In Backup
> Exec, all devices in a pool needed to be the same, but because of the
> way bacula works it doesn't seem like this would be a necessity. A
> pseudo-example might look like this:
>
> DevPool {
> Name = "DevPool1"
> ...
> }
>
> Device (
> Name = "TapeDrive1"
> DevPool = "DevPool1"
> DevPoolPriority = 1
> ...
> }
>
> Device (
> Name = "TapeDrive2"
> DevPool = "DevPool1"
> DevPoolPriority = 2
> ...
> }
>
> That could create a device pool that could be referenced as a backup
> device in a job (the where), which would backup first to the lowest
> DevPoolPriority device. When that device is full, it will begin using
> the second lowest DevPoolPriority device, etc. Just sort of a wishlist
> sort of thing. Anyone else think this would be a good thing? It would
> save on having to purchase an autoloader if you already have multiple
> independent tape drives.
>
> I'll stop dreaming now.
>
> -DH
>
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