On Sat, Sep 05, 2009 at 06:52:35PM -0600, dan wrote:

[...]

> You make a lot more sence here, but I think you overestimate CPU usage.
> backuppc is so IO bound that after your get a 2Ghz+ Dual core and 2GB RAM
> you can pretty much blame your disks for slow performance.  I have a dual
> core 2Ghz Opteron with 2GB of ram and 8 drives in a linux raid10 and hard
> disk speed is still my bottleneck.  I run 4 concurrent backups on that
> machine and it does give high system load numbers but still handles the
> desktops in the office faster than 3 concurrent while 5 concurrent takes
> quite a bit longer to complete. filesystem choice and io scheduler do make a
> difference but faster disks is the only real cure.

I'd add some memory first. 4GB is so cheap these days and it helps a lot
for disk caching. I've seen a performance boost by upgrading from 2 GB
to 6 GB on a quad core Xeon which is also heavily I/O bound.oO(I've got
to switch to RAID-10, the RAID-5 really kills performance...)

Tino.

-- 
"What we nourish flourishes." - "Was wir nähren erblüht."

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