linux-kernel - Re: limits on raid

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Date:	Sun, 17 Jun 2007 09:28:09 -0400
From:	Wakko Warner <wakko@...mx.eu.org>
To:	dean gaudet <dean@...tic.org>
Cc:	Neil Brown <neilb@...e.de>, david@...g.hm,
	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org
Subject: Re: limits on raid

dean gaudet wrote:
> On Sat, 16 Jun 2007, Wakko Warner wrote:
> 
> > When I've had an unclean shutdown on one of my systems (10x 50gb raid5) it's
> > always slowed the system down when booting up.  Quite significantly I must
> > say.  I wait until I can login and change the rebuild max speed to slow it
> > down while I'm using it.   But that is another thing.
> 
> i use an external write-intent bitmap on a raid1 to avoid this... you 
> could use internal bitmap but that slows down i/o too much for my tastes.  
> i also use an external xfs journal for the same reason.  2 disk raid1 for 
> root/journal/bitmap, N disk raid5 for bulk storage.  no spindles in 
> common.

I must remember this if I have to rebuild the array.  Although I'm
considering moving to a hardware raid solution when I upgrade my storage.

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