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From: Stephen Frost <sfrost@snowman.net>
To: Peter Childs <peterachilds@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: setting up raid10 with more than 4 drives
Date: Wed, 30 May 2007 06:42:36 -0400
Message-ID: <20070530104236.GW7531@tamriel.snowman.net> (raw)
In-Reply-To: <a2de01dd0705300029t52ceb76fx25c3ad67db0c43c0@mail.gmail.com>
References: <a97c77030705291918j54b88259ia2f725e8b9e39dd6@mail.gmail.com>
	<C2823CFD.31AEB%llonergan@greenplum.com>
	<36e682920705292141k9aa038btb543d97cee0fa4a1@mail.gmail.com>
	<Pine.LNX.4.64.0705292227370.6705@asgard.lang.hm>
	<a2de01dd0705300029t52ceb76fx25c3ad67db0c43c0@mail.gmail.com>

* Peter Childs (peterachilds@gmail.com) wrote:
> Good point, also if you had Raid 1 with 3 drives with some bit errors at
> least you can take a vote on whats right. Where as if you only have 2 and
> they disagree how do you know which is right other than pick one and hope...
> But whatever it will be slower to keep in sync on a heavy write system.

I'm not sure, but I don't think most RAID1 systems do reads against all
drives and compare the results before returning it to the caller...  I'd
be curious if I'm wrong.

	Thanks,

		Stephen

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