On 7/28/2016 10:37 AM, Ken Mandelberg wrote:
> ...
> The idea would be treating the storage pool like a virtual tape
> drive with a limited number of slots. Unmounting a volume means
> copy it out to the network. Mounting a volume means copying it back.
> Once a volume is unmounted its marked read/only.

That seems a reasonable approach, although I don't know of anything like 
that. If something like rsync is used for the unmount copy, then it 
would not be necessary to mark it read-only.

It is possible to define mounting and unmounting commands for a Device 
resource. At one time this was used for writing to DVD, etc. I'm not 
sure of the status of these directives in 7.4.x, but they do still 
exist. See 
http://www.bacula.org/7.4.x-manuals/en/main/Storage_Daemon_Configuratio.html#SECTION001940000000000000000.
 
It should be possible to use a bash script to rsync the volume files 
back and forth and use that as the "Mount Command" and "Unmount Command" 
for the Device resource.



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