On Jul 17, 2008, at 10:06 AM, Shad L. Lords wrote:

> 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.


This is subjective.  You see it as a complication.  I see it as a  
simplification.

-- 
Dan Langille -- http://www.langille.org/






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