John Drescher wrote:
>> host1-sd.conf
>> =============
>>
>> Autochanger {
>>   Name = ait4-changer
>>   Device = ait4-drive1
>>   Device = ait4-drive2
>>   Device = ait4-drive3
>>   Device = ait4-drive4
>>   Changer Command = "/usr/lib/bacula/mtx-changer %c %o %S %a %d"
>>   Changer Device = /dev/sg0
>> }
>>
>> Device {
>>   Name = ait4-drive1
>>   Archive Device = /dev/nst0
>>   Drive Index = 0
>>   Auto Changer = yes
>>   Media Type = ait4
>>   ...
>> }
>>
>> Device {
>>   Name = ait4-drive2
>>   Archive Device = /dev/nst1
>>   Drive Index = 1
>>   Auto Changer = yes
>>   Media Type = ait4
>>   ...
>> }
>>
>> host2-sd.conf
>> =============
>>
>> Device {
>>   Name = ait4-drive1
>>   Archive Device = /dev/nst0
>>   Drive Index = 2
>>   Auto Changer = yes
>>   Media Type = ait4
>>   ...
>> }
>>
>> Device {
>>   Name = ait4-drive2
>>   Archive Device = /dev/nst1
>>   Drive Index = 3
>>   Auto Changer = yes
>>   Media Type = ait4
>>   ...
>> }
>>
>> Is this something that would even be possible to implement in the
>> future?  Would anyone else be interested in something like this?
>>
> That will not work, You need to have the storage daemon on only the
> host with the tape drives and modify mtx-changer to send mtx commands
> via ssh. This should not be too difficult.


That is too bad in addition to possibly having issues with multiple mtx 
commands attempting to be sent at the same time it also makes it 
impossible to define all 4 drives as available for use from a job. 
Because all 4 drives are in the same autochanger and they all have 
access to the same tapes it would be nice to just use ait4-changer, ait4 
for the storage definition and have it pick one of the 4 (or all 4) for 
writing.  One of the reasons for splitting drives between hosts was to 
improve the speed of the backup.  By having the restriction of the 
autochanger and drives belonging to the same host you are complicating 
the setup.

-Shad

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