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From: Bruno Wolff III <bruno@wolff.to>
To: Shane Ambler <pgsql@Sheeky.Biz>
Cc: Peter Kovacs <maxottovonstirlitz@gmail.com>
Cc: Jeff Davis <pgsql@j-davis.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Carlos Moreno <moreno_pg@mochima.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Two hard drives --- what to do with them?
Date: Wed, 28 Feb 2007 21:35:21 -0600
Message-ID: <20070301033521.GC14102@wolff.to> (raw)
In-Reply-To: <45E47DBD.6090803@Sheeky.Biz>
References: <45E0A500.1010707@commandprompt.com>
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	<2055.1172375931@sss.pgh.pa.us>
	<b6e8f2e80702251411q5a27eb53re9c2a299b8e3880a@mail.gmail.com>
	<1172526666.10824.315.camel@dogma.v10.wvs>
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	<1172535914.10824.327.camel@dogma.v10.wvs>
	<45E3BC09.60100@Sheeky.Biz>
	<b6e8f2e80702270027s1c684f42vb3eca0a1d87ed5fb@mail.gmail.com>
	<45E47DBD.6090803@Sheeky.Biz>

On Wed, Feb 28, 2007 at 05:21:41 +1030,
  Shane Ambler <pgsql@Sheeky.Biz> wrote:
> 
> The difference between SCSI and IDE/SATA in this case is a lot if not 
> all IDE/SATA drives tell you that the cache is disabled when you ask it 
> to but they either don't actually disable it or they don't retain the 
> setting so you get caught later. SCSI disks can be trusted when you set 
> this option.

I have some Western Digital Caviars and they don't lie about disabling
write caching.

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