Received: from maia.hub.org (maia-3.hub.org [200.46.204.243])
	by mail.postgresql.org (Postfix) with ESMTP id 75DE51337B51
	for <pgsql-performance-postgresql.org@mail.postgresql.org>;
	Wed,  1 Dec 2010 04:12:21 -0400 (AST)
Received: from mail.postgresql.org ([200.46.204.86])
	by maia.hub.org (mx1.hub.org [200.46.204.243]) (amavisd-maia,
	port 10024) with ESMTP id 83185-03
	for <pgsql-performance-postgresql.org@mail.postgresql.org>;
	Wed,  1 Dec 2010 08:12:14 +0000 (UTC)
X-Greylist: from auto-whitelisted by SQLgrey-1.7.6
Received: from 30.mail-out.ovh.net (30.mail-out.ovh.net [213.186.62.213])
	by mail.postgresql.org (Postfix) with SMTP id D6C091337B39
	for <pgsql-performance@postgresql.org>;
	Wed,  1 Dec 2010 04:12:13 -0400 (AST)
Received: (qmail 31369 invoked by uid 503); 1 Dec 2010 07:48:01 -0000
Received: from b9.ovh.net (HELO mail632.ha.ovh.net) (213.186.33.59)
	by 30.mail-out.ovh.net with SMTP; 1 Dec 2010 07:48:01 -0000
Received: from b0.ovh.net (HELO queueout) (213.186.33.50)
	by b0.ovh.net with SMTP; 1 Dec 2010 10:12:11 +0200
Received: from par69-8-88-161-102-87.fbx.proxad.net (HELO apollo13)
	(lists%peufeu.com@88.161.102.87)
	by ns0.ovh.net with SMTP; 1 Dec 2010 10:12:10 +0200
Content-Type: text/plain; charset=utf-8; format=flowed; delsp=yes
To: "Greg Smith" <greg@2ndquadrant.com>, "Bruce Momjian" <bruce@momjian.us>
Cc: "Tom Lane" <tgl@sss.pgh.pa.us>, "Kevin Grittner"
	<Kevin.Grittner@wicourts.gov>, jd@commandprompt.com, "Scott Marlowe"
	<scott.marlowe@gmail.com>,
	"Steve Crawford" <scrawford@pinpointresearch.com>,
	pgsql-performance@postgresql.org, "Ben Chobot" <bench@silentmedia.com>
Subject: Re: BBU Cache vs. spindles
References: <201012010354.oB13sxQ08756@momjian.us>
Date: Wed, 01 Dec 2010 09:12:08 +0100
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
From: "Pierre C" <lists@peufeu.com>
Message-ID: <op.vm0zqifmeorkce@apollo13>
In-Reply-To: <201012010354.oB13sxQ08756@momjian.us>
User-Agent: Opera Mail/10.62 (Linux)
X-Ovh-Tracer-Id: 241224056076240535
X-Ovh-Remote: 88.161.102.87 (par69-8-88-161-102-87.fbx.proxad.net)
X-Ovh-Local: 213.186.33.20 (ns0.ovh.net)
X-Spam-Check: DONE|U 0.5/N
X-Virus-Scanned: Maia Mailguard 1.0.1
X-Spam-Status: No, hits=-1.9 tagged_above=-10 required=5 tests=BAYES_00=-1.9,
	RCVD_IN_DNSWL_NONE=-0.0001
X-Spam-Level: 
X-Archive-Number: 201012/3
X-Sequence-Number: 41455


> Is that true?  I have no idea.  I thought everything was done at the
> 512-byte block level.

Newer disks (2TB and up) can have 4k sectors, but this still means a page  
spans several sectors.