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Date: Thu, 15 Nov 2001 10:17:51 -0800 (PST)
From: Joel Jaeggli <joelja@darkwing.uoregon.edu>
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To: Roy Sigurd Karlsbakk <roy@karlsbakk.net>
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Subject: Re: Linux i/o tweaking
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I guess the question I'd ask would be what kinda number do you expect from 
the raid 5 stripe. 107MB/s sounds like a reasonable number from a two 
channel u160 controller... 

my previous best is around 89MB/s with 4 cheetah 15K 18gb drives raid/0

On Thu, 15 Nov 2001, Roy Sigurd Karlsbakk 
wrote:

> Hi all
> 
> After three days at Compaq's lab in Oslo, testing their medium-level
> servers and storage systems with Linux, I've come to some sort of
> conclusions, although these may be wrong. I also have come over a few
> problems that I couln't find a good solution to.
> 
>  * When running RAID from a Compaq Smart 5302/64 controller, software
> RAID-5 is (slightly - ~15%) faster (on JBOD - each disk is configured as
> a RAID-0 device with max - 256kB - stripe size) than the
> hardware/controller based RAID-5. Both CPUs (1266MHz/512kB cache) are
> maxed out by reading from software RAID-5 (???), giving me >= 107MB/s on
> two SCSI-3 buses with six disks on each bus.
> 
>  * Even though I can get up to 25 MB/s from each disk, I can't get more
> than 107 MB/s on the whole bunch (12 drives). It doesn't help much to do
> RAID-0 either. Don't understand anything ...
> 
> Thanks for all help.
> 
> roy
> 
> --
> Roy Sigurd Karlsbakk, MCSE, MCNE, CLS, LCA
> 
> Computers are like air conditioners.
> They stop working when you open Windows.
> 
> 
> 
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-- 
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Joel Jaeggli				       joelja@darkwing.uoregon.edu    
Academic User Services			     consult@gladstone.uoregon.edu
     PGP Key Fingerprint: 1DE9 8FCA 51FB 4195 B42A 9C32 A30D 121E
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It is clear that the arm of criticism cannot replace the criticism of
arms.  Karl Marx -- Introduction to the critique of Hegel's Philosophy of
the right, 1843.


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