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From: Ian Westmacott <ianw@intellivid.com>
To: Jim C. Nasby <jnasby@pervasive.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: improving write performance for logging
Date: Fri, 06 Jan 2006 14:02:57 -0500
Message-ID: <1136574178.31602.13.camel@spectre.intellivid.com> (raw)
In-Reply-To: <20060106163732.GL3902@pervasive.com>
References: <43BB0C5C.8020207@computer.org>
	<1136382865.24450.7.camel@spectre.intellivid.com>
	<7.0.1.0.2.20060104092139.01c37da0@earthlink.net>
	<1136390438.24450.49.camel@spectre.intellivid.com>
	<20060106010822.GK43311@pervasive.com>
	<1136556006.31602.5.camel@spectre.intellivid.com>
	<20060106163732.GL3902@pervasive.com>

On Fri, 2006-01-06 at 10:37 -0600, Jim C. Nasby wrote:
> The problem is that if you lose WAL or the data, you've lost everything.
> So you might as well use raid0 for the data if you're using it for WAL.
> Or switch WAL to raid1. Actually, a really good controller *might* be
> able to do a good job of raid5 for WAL. Or just use raid10.

If the WAL is lost, can you lose more than the data since the last
checkpoint?

-- 
Ian Westmacott <ianw@intellivid.com>
Intellivid Corp.




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