On Wed, Jun 02, 2010 at 12:11:57PM +0200, Ralf Gross wrote:

> 
> I've had the same problem. First I started with a simple 2 Disk RAID1
> as spool area for our 3 LTO-4 drives. With more jobs running in
> parallel this was simply not enought. In the end I put 6 WD Raptor
> SATA drives in the server, configured a large RAID10 and limited the
> number of concurrent jobs to 3. Now I get ~100 MB/s for each of the 3
> jobs.
> 
> If you really need to run so many jobs concurrently put as many fast
> disks in the server as possible and configure them as RAID10. Maybe
> use SSD's instead of SATA/SAS Disk?
> 
> Ralf
> 
> ------------------------------------------------------------------------------
-- 

Hi Ralf, thanks for the response,

Tuning it down to 3+3 (from the original 6+6) seems to alleviate but not
solve the problem completely. I totaly agree with your suggestion, from
this point onwards it seems to be a case of finding a spooling setup
with enough I/O oomph. 

One question however, in your setup you have limited your concurrent
jobs to 3 as in 3 jobs overall or as in 3 jobs per drive (9 overall)? 


Best Regards,
Athanasios Douitsis, 
National Technical University of Athens NOC

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