Gabriele Bulfon wrote:

> When I run the backup on this storage, though, speed slow down to a 
> maximum of 800-900k/sec.
> How can I investigate the reason?
> I see on /var/adm/messages that the system is has seen the disk as an 
> USB2 full speed.

USB2 "full speed" is vendor-speak for "slow".

USB2 supports "full speed" (12 Mbit/s) and "high speed" (theoretically 
480 Mbit/s)*. Your device needs to register as "high speed" to perform 
decently.

If that's not the issue and you meant "high speed" ... have you run any 
I/O benchmarks (even a simple file copy) to see if the device is 
performing OK outside Bacula?

--
Craig Ringer

* Actually, it also supports a low speed for peripherals like mice and 
keyboards, but nobody cares about that.

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