linux-kernel - Re: limits on raid

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Message-ID: <4676BEC2.7090809@redhat.com>
Date:	Mon, 18 Jun 2007 11:20:02 -0600
From:	Brendan Conoboy <blc@...hat.com>
To:	david@...g.hm
CC:	Neil Brown <neilb@...e.de>, Wakko Warner <wakko@...mx.eu.org>,
	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org
Subject: Re: limits on raid

david@...g.hm wrote:
> in my case it takes 2+ days to resync the array before I can do any 
> performance testing with it. for some reason it's only doing the rebuild 
> at ~5M/sec (even though I've increased the min and max rebuild speeds 
> and a dd to the array seems to be ~44M/sec, even during the rebuild)

With performance like that, it sounds like you're saturating a bus 
somewhere along the line.  If you're using scsi, for instance, it's very 
easy for a long chain of drives to overwhelm a channel.  You might also 
want to consider some other RAID layouts like 1+0 or 5+0 depending upon 
your space vs. reliability needs.

-- 
Brendan Conoboy / Red Hat, Inc. / blc@...hat.com
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