> 
> And for the file volumes either:
> 
> 12 x 600GB 15K SAS (RAID 5 or 6?) - faster disks (or is it in a raid 5?) and 
> less
> space (approx 6TB)
> 
> OR
> 
> 12 x 2TB 7.2K SAS/SATA (RAID 10) - slower disks but more space (approx
> 11.18 TB)
> 

If you are backing up over 1Gbit/s ethernet then you require a storage that can 
write at a maximum of 100mbytes/s and either configuration should be more than 
capable of handling way more than that, assuming that it never gets 
ridiculously fragmented. If you use RAID5 then I recommend a hardware RAID 
controller with battery backed write cache, although it's less of a requirement 
for "streaming" storage than random access database storage where small (< 
stripe size) writes are frequent.

I would start by looking at how fast Bacula can push things on to disk. I 
wonder if there is a way of backing up to /dev/null so this can be measured? 
Once you have that figure then you can think about what sort of disk throughput 
you need.

James


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