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From: Scott Marlowe <scott.marlowe@gmail.com>
To: Matthew Wakeling <matthew@flymine.org>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: Raid 10 chunksize
Date: Wed, 1 Apr 2009 11:04:12 -0600
Message-ID: <dcc563d10904011004u11b7b4a2mb637fa841eba49c2@mail.gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.00.0904011757580.21772@aragorn.flymine.org>
References: <C5F14970.3CA1%scott@richrelevance.com>
	<49D31E85.8050405@paradise.net.nz>
	<49D37CAA.6080100@ummon.com>
	<alpine.GSO.2.01.0904011144270.23835@westnet.com>
	<49D3932D.3080808@ummon.com>
	<dcc563d10904010941r283b7536g383c8daa8b933ce7@mail.gmail.com>
	<49D39AFA.8000700@ummon.com>
	<alpine.DEB.2.00.0904011757580.21772@aragorn.flymine.org>

On Wed, Apr 1, 2009 at 11:01 AM, Matthew Wakeling <matthew@flymine.org> wrote:
> On Wed, 1 Apr 2009, Stef Telford wrote:
>>
>>   Good UPS, a warm PITR standby, offsite backups and regular checks is
>> "good enough" for me, and really, that's what it all comes down to.
>> Mitigating risk and factors into an 'acceptable' amount for each person.
>> However, if you see over a 2x improvement from turning write-cache 'on'
>> and have everything else in place, well, that seems like a 'no-brainer'
>> to me, at least ;)
>
> In that case, buying a battery-backed-up cache in the RAID controller would
> be even more of a no-brainer.

This is especially true in that you can reduce downtime.  A lot of
times downtime costs as much as anything else.



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