[Bioclusters] 3ware 7850 RAID 5 performance

[Vsevolod Ilyushchenko]

Hi,

Is anyone using a 3ware 7850 hardware RAID card set to RAID 5? 
According, to the docs, it's using something called "accelerated RAID 5" 
which should give read *and write* speeds in excess of 100 Mb/s. Several 
tests on a dual Linux P3 1.26 Ghz box with ext3 indicate much lower 
speeds: 47 Mb/s sequential read and 12 (twelve!) Mb/s sequential write. 
There are 5 drives in the RAID 5 configuration.

Has anyone benchmarked this card under Linux? What numbers are people 
seeing? Can anyone suggest parameters to tune?

Thanks,
Simon

-- 
Simon (Vsevolod ILyushchenko)   simonf@cshl.edu
http://www.simonf.com          simonf@simonf.com

Even computers need analysts these days!
				("Spider-Man")