[Gllug] Centos 5.6 3ware raid 5

Ken Smith kens at kensnet.org
Wed Feb 8 12:24:47 UTC 2012

Hi, I didn't get any response on the Centos list so I thought I'd ask 
here for any experience with using a 3ware raid card as a simple IDE 

I've seen comments about the poor performance of these cards with raid 5 
configs. I have an old card with 3 x 500G IDE drives connected in raid 5 
and I'm getting around 10mb/s write performance. :-(

I'm seeing high iowait figures at times and associated very high cpu 
load average figures, probably because, under load, everything is 
stacked up waiting for the disks to actually do something.

A non-raid sata disk in the same machine manages 70mb/s

Does anyone know what the performance is like if I used the 3ware just 
as an IDE controller? I could then switch to software raid5?



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