On Mon, Oct 4, 2010 at 1:37 PM, Tim Gustafson <tjg AT soe.ucsc DOT edu> wrote:
> We have recently installed Bacula onto a FreeBSD server and several Linux, 
> SunOS and FreeBSD clients.  The Bacula director and storage daemon run on a 
> box with about 6 terabytes of RAID6 storage (SATA 300 drives, 1TB each, 
> Adaptec RAID controller with 512MB cache).  The box has 16GB of RAM and is 
> not really doing much else right now. We're using mySQL for our database 
> back-end, and we have MD5 hashing of files turned off ("Accurate = mcs" and 
> "Verify = mcs" are set in bacula-dir.conf).
>
> However, we're getting pretty pitiful throughput numbers.  When I scp a file 
> from my workstation to the Bacula server, I get something like 40MB/s 
> (320Mb/s).  When Bacula runs, we're lucky to get 20MB/s (160Mb/s), and we 
> often get numbers closer to 10MB/s (80Mb/s).
>
> I Googled "tuning bacula" and came up with primarily stuff related to tuning 
> Postgres as it relates to Bacula, but nothing about tuning the file daemon or 
> the storage daemon.  Can anyone point me to some leads as far as what I can 
> do to bump up the throughput?  We have a data set that is several terabytes 
> large to back up, and it will never complete in a reasonable amount of time 
> at 10MB/s.  I need to achieve something closer to 40MB/s to make this a 
> workable option.
>

I would start by turning off software compression and do performance
tests with full backups.

A second thing to try is to enable attribute spooling so the database
does not slow down the backup. This can be useful if you have millions
of files.

John

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