Thanks for the reply, John.  I'll give it a go.  The spooling will be on
RAID 10, so I won't get the performance of RAID 0, but we will see how
it goes.

Cheers,
Bryan

On Mon, 2012-01-23 at 17:59 -0500, John Drescher wrote:
> > But will this speed up my backups?   Generally speaking, should Bacula be
> > able to write two the two tapes devices more quickly than it can write
> > to one?  The unit in question is a Tandberg Data StorageLibrary T24 LTO
> > with two serial attached scsi LTO4 tape devices, attached to a server
> > running Centos 6.2.
> 
> It will not speed up a single job since 1 job can not use more than 1
> drive however if you have concurrent jobs with spooling and you can
> provide enough bandwidth to keep up with the drives it can speed up
> multiple jobs. Remember that at 2:1 compression these LTO4 drives
> write at 120MB /s each so you will need to have a raid array (raid 0
> maybe) or fast SSD for your spool location and this raid probably
> should not be on the same drives as your source data.
> 
> John



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