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From: Jim C. Nasby <jnasby@pervasive.com>
To: Scott Marlowe <smarlowe@g2switchworks.com>
Cc: Francisco Reyes <lists@stringsutils.com>
Cc: Michael Stone <mstone+postgres@mathom.us>
Cc: pgsql-performance@postgresql.org
Subject: Re: Inserts optimization?
Date: Tue, 18 Apr 2006 16:03:56 -0500
Message-ID: <20060418210356.GH49405@pervasive.com> (raw)
In-Reply-To: <1145045732.23538.86.camel@state.g2switchworks.com>
References: <443DA715.4060606@gmail.com>
	<9549.1144903344@sss.pgh.pa.us>
	<cone.1144954763.735087.95544.5001@35st-server.simplicato.com>
	<20060414055923.GX49405@pervasive.com>
	<cone.1145014225.784898.23930.1000@zoraida.natserv.net>
	<20060414114911.GG32678@mathom.us>
	<cone.1145037716.354055.283.5001@35st-server.simplicato.com>
	<20060414190620.GH32678@mathom.us>
	<cone.1145045358.517551.283.5001@35st-server.simplicato.com>
	<1145045732.23538.86.camel@state.g2switchworks.com>

On Fri, Apr 14, 2006 at 03:15:33PM -0500, Scott Marlowe wrote:
> On Fri, 2006-04-14 at 15:09, Francisco Reyes wrote:
> > Michael Stone writes:
> > 
> > > I still don't follow that. Why would the RAID level matter? IOW, are you 
> > > actually wanting 2 spares, or are you just stick with that because you 
> > > need a factor of two disks for your mirrors?
> > 
> > RAID 10 needs pairs.. so we can either have no spares or 2 spares.
> 
> Spares are placed in service one at a time.  You don't need 2 spares for
> RAID 10, trust me.

Sadly, 3ware doesn't produce any controllers with the ability to do an
odd number of channels, so you end up burning through 2 slots to get a
hot spare (unless you spend substantially more money and go with the
next model up).
-- 
Jim C. Nasby, Sr. Engineering Consultant      jnasby@pervasive.com
Pervasive Software      http://pervasive.com    work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf       cell: 512-569-9461



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