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From: David Rees <drees76@gmail.com>
To: Scott Marlowe <scott.marlowe@gmail.com>
Cc: Peter Schuller <peter.schuller@infidyne.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Occasional Slow Commit
Date: Thu, 6 Nov 2008 10:46:56 -0800
Message-ID: <72dbd3150811061046w4fdcd9bbnf78459b9dffd566d@mail.gmail.com> (raw)
In-Reply-To: <dcc563d10811060807n44373443hf329492bdac6d5df@mail.gmail.com>
References: <72dbd3150810271723w57859013v9c4e3718ae86fba@mail.gmail.com>
	<Pine.GSO.4.64.0810290906150.19233@westnet.com>
	<72dbd3150810291530q7a95da64j2c39354de9ad91d1@mail.gmail.com>
	<72dbd3150810311714s51639bc3kfdbe03a7b51bc55c@mail.gmail.com>
	<72dbd3150811051925n50ead40cn30354990ebb8bfb6@mail.gmail.com>
	<20081106102147.GB70379@hyperion.scode.org>
	<72dbd3150811060747u7f3c2aadv3c6658d285d74455@mail.gmail.com>
	<dcc563d10811060807n44373443hf329492bdac6d5df@mail.gmail.com>

On Thu, Nov 6, 2008 at 8:07 AM, Scott Marlowe <scott.marlowe@gmail.com> wrote:
> On Thu, Nov 6, 2008 at 8:47 AM, David Rees <drees76@gmail.com> wrote:
>>
>> In the case of the machines without a BBU on them, they are configured
>> to be in WriteBack, but are actually running in WriteThrough.
>
> I'm pretty sure the LSIs will refuse to actually run in writeback without a BBU.

It's configurable (at least on the MegaRAID cards I'm using). There's
an option you can turn on that lets you run in writeback when the BBU
is offline.

-Dave

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