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From: Greg Smith <gsmith@gregsmith.com>
To: Craig Ringer <craig@postnewspapers.com.au>
Cc: pgsql-performance@postgresql.org
Subject: Re: Performance increase with elevator=deadline
Date: Fri, 11 Apr 2008 15:56:36 -0400 (EDT)
Message-ID: <Pine.GSO.4.64.0804111553410.21193@westnet.com> (raw)
In-Reply-To: <47FFA7FF.10801@postnewspapers.com.au>
References: <D960CB61B694CF459DCFB4B0128514C201FA62C8@exadv11.host.magwien.gv.at>
	<C050E63A-2209-4E89-AA99-6A327CCE7380@torgo.978.org>
	<Pine.LNX.4.64.0804111736580.20402@aragorn.flymine.org>
	<47FFA7FF.10801@postnewspapers.com.au>

On Sat, 12 Apr 2008, Craig Ringer wrote:

> Speaking of I/O performance with PostgreSQL, has anybody here done any 
> testing to compare results with LVM to results with the same filesystem on a 
> conventionally partitioned or raw volume?

There was some chatter on this topic last year; a quick search finds

http://archives.postgresql.org/pgsql-performance/2007-06/msg00005.php

which is a fair statement of the situation.  I don't recall any specific 
benchmarks.

--
* Greg Smith gsmith@gregsmith.com http://www.gregsmith.com Baltimore, MD

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