Il 01/09/2011 13:38, frank_sg ha scritto:
> Thanks fpr replying.
>
> @Alexandre: Yes, exactly, the 10MB/s (average) come from bacula job
> report.
>
> @Marcello: No - very time the spool fs is full (or the maximum spool
> size per job etc.) is reached the spool fs is despooled to tape. And
> that is where I hope to get the advantage from: despooling with full
> speed to tape. You are right, the fs has to be fast enough - which
> SSDs would be obviously. That the reason for the idea about them. A
> RAID0 with 12 disks direct attached with SAS should also be fast
> enough - but which option is the one to choose?
>
> Regards, Frank
>

I have not investigated deeply into bacula spooling... After your 
clarification I re-read this:

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

but I'm still not sure how the whole thing works if one doesn't set a 
limit on spool area size (I didn't).

What puzzles me is that every e-mail I get from bacula (one e-mail per 
job run) contains lines similar to these:

Job write elapsed time = 00:01:35, Transfer rate = 4.455 M Bytes/second
Committing spooled data to Volume "WednesdayTape". Despooling
423,960,356 bytes ...
Despooling elapsed time = 00:00:25, Transfer rate = 16.95 M Bytes/second
Sending spooled attrs to the Director. Despooling 2,392,621 bytes ...
[...]
Rate:                   3405.1 KB/s
Software Compression:   None

Which makes me wonder whether each job is spooled independently...

About job speed: notice how the final speed reported for the whole job 
is very low compared to the despooling speed.
That figure can be misleading. I think one has to consider transfer rate 
and despooling speed separately.

-- 
Marcello Romani

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