> I tried to enable spooling (500 Gb spool) for the tape backup. The perf were
> worse.
>
BTW, I use 5GB spool.

I assume then you do not run concurrent jobs? For a single job the
time will be longer because bacula does not concurrently spool and
despool but with concurrent jobs and spooling with a few GB spool size
bacula will maximize the performance of the tape drive when spooling
is enabled. I get despool rates of 20 to 50MB/s for LTO2 which is
about what the tape drive can handle. The rates vary because of
compression.

>
> For disk backup, it seems to me spooling does not make sense.

Attribute spooling makes sense for either though.



-- 
John M. Drescher

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