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Date: Sun, 05 Feb 2006 11:41:22 +0100
From: Ivan Voras <ivoras@fer.hr>
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To: "Marc G. Fournier" <scrappy@hub.org>
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Cc: stable@freebsd.org, freebsd-proliant@freebsd.org
Subject: Re: Compaq Proliant CISS slow writes
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Marc G. Fournier wrote:
> 
> Not sure if this is standard, but on an idle machine (ie. just set it 
> up, nothing running on it yet), with RAID1+0 across 4 drives:
> 
> Writing the 853 Megabyte file, 'iozone.tmp'...15.656250 seconds
> Reading the file...3.921875 seconds
> 
> IOZONE performance measurements:
>         57129601 bytes/second for writing the file
>         228063191 bytes/second for reading the file

I could live with 4x slower writes - that would get me ~18MB/s; I'd 
settle for ~10MB/s as the server is on a 100Mbit/s network.

If it's the standard situation then ok, it's "higher power" but somehow 
I doubt 3 10kRPM SCSI drives in RAID5 should be this slow. Toying with 
mount options doesn't help.

(btw. everything is fine on the attached desktop-grade IDE disk [very 
recent model]: 45MB/s writes, 50MB/s reads)