On Tue, 26 Jul 2011 00:18:05 -0700
Steve Ellis <ellis AT brouhaha DOT com> wrote:

[...]
> Another point, even with your current config, if you 
> aren't doing data spooling you are probably slowing things down
> further, as well as wearing out both the tapes and heads on the drive
> with lots of shoeshining.
(I'm asking as a person having almost zero prior experience with tape
drives for backup purposes.)

Among other things, I'm doing full backups of a set of machines to a
single tape--yes, full backup each time, no incremental/differential
which means I supposedly have just straightforward data flows from
FDs to the SD.  At present time I have max concurrent jobs set to 1
on my tape drive resource and no data spooling turned on.
Would I benefit from enabling data spooling in this scenario?

To present some numbers, each machine's data is about 50-80G and I can
use about 200G for the spool directory which means I could do spooling
for 3-4 jobs in parallel (as described in [1]).
Would that improve tape usage pattern?

1. http://www.bacula.org/en/dev-manual/main/main/Data_Spooling.html

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