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Re: [Bacula-devel] request: Allow tape drives to be associated with autochanger resource on different host


On Mon, Jul 21, 2008 at 6:31 PM, Kjetil Torgrim Homme
<kjetilho@xxxxxxxxx> wrote:
> "Shad L. Lords" <slords@xxxxxxxxxxxx> writes:
>
>> Item  1: Allow tape drives to be associated with autochanger
>>           resource on different host
>>     Note: A single robot controls multiple drives but is only connected
>>           to one machine.  It is currently possible to work around
>>           things by having remote hosts issue mtx commands over ssh but
>>           nothing prevents multiple mtx commands from being issued at
>>           the same time.
>
> why not use something like
>
>   ssh robotmaster "flock /var/run/mtx.lock mtx ..."
>
> as your tapechanger command?  flock will wait until it gets a lock on
> the file, so there will never be two mtx processes running
> simultaneously.
> --
The reason is that he wants to split up his tape multi drive changer
so that the drives are on more than 1 machine to allow for higher
performance but at the same time he wants to have 1 changer resource
in bacula and send the jobs to the 1 changer.

John

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