Re: [Bacula-users] low despooling speeds when parallelism is increased

On Wed, Jun 02, 2010 at 11:29:44AM -0400, Bob Hetzel wrote:

> What CPU's do you have in your 2950?  I'm backing up to two LTO-2 in my 
> PowerEdge 2900 server (dual Xeon 5160 CPU's) and it seems to be pretty 
> maxed out with two tape drives.  On my R710 I only get 70MB/sec despool 
> rates to LTO-4 drives.
> 
> If you can't get higher results when using a SAN I'd think that the 
> bottleneck is the server CPU.  If you're not CPU bound, then increasing the 
> read cache wherever you're holding the spool should help.
> 
>     Bob
> 

Bob, sorry for the late answer,

We are not aware of any CPU bottlenecks on our setup. Our diagrams show
that both the load and the CPU usage remain quite low. On the contrary,
using a RAID10 setup increased our speed somewhat. As you indicate, the
cache should have some significance although we didn't have the chance
to play with it much. If there is more in the future I'll reply again on
the list as our tests progress.

Best Regards,
Athanasios

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