linux-kernel - Re: Slow Soft-RAID 5 performance

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Message-ID: <469E4A70.1000306@grupopie.com>
Date:	Wed, 18 Jul 2007 18:14:24 +0100
From:	Rui Santos <rsantos@...popie.com>
To:	koan <koan00@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Slow Soft-RAID 5 performance

koan wrote:
> How did you create the ext3 filesystem?

The chunk_size is at 256KB, ext3 block size is 4k. I believe the correct
option that should be passed trough to --stride is 64.
Am I correct ?

I've also tested ( after sending my first report ) with xfs.
I've also increases readahead to 65535 on all HD's
I've also increases the stripe_cache_size to 16384.

I can now get ~100MB/sec...

>
> Did you use the appropriate --stride option as noted here:
> http://tldp.org/HOWTO/Software-RAID-HOWTO-5.html (#5.11)
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