On Fri, 6 Jun 2008, Tobias Bartel wrote:

> Hallo,
>
> i added 50GB for spooling
> >   Maximum Job Spool Size = 53687091200
>
> although a bit faster my last test run still did not come close to the speeds
> mentioned by others:

I'm not really surprised...

> >   Software Compression:   27,9 %

Switch off software compression. This is a cpu sucker and slows things
down markedly.

LTO series have fairly efficient hardware compression and it's much faster
than software compression

> I double checked the connection and the 100MBit/s Link is performing as one
> could expect.

100Mb/s will give you a _MAXIMUM_ of 11MB/sec. When you take spooling
overhead (spool to disk, flush from disk) into account 5MB/s isn't a bad
throughput/

> Are 50GB for spooling not enough? Should i upgrade to GBit
> connection or is there anything else i could try?

50GB space is fine, as long as it is fast enough (have you benchmarked
it?) - a single dedicated hard disk is barely fast enough for spooling 1
LTO2 job and LTO3/4 can easily outrun a hard drive's sustained throughput.

Upgrading your networking will increase maximum network throughput to
something approaching what LTO can cope with.

Start looking at parts of the job:

What speed is Bacula reporting for spooling to disk?

What is Bacula reporting for the despooling speed?


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