Received: from localhost (unknown [200.46.204.183]) by mail.postgresql.org (Postfix) with ESMTP id 25CF8633FAD for ; Wed, 1 Apr 2009 13:41:51 -0300 (ADT) Received: from mail.postgresql.org ([200.46.204.86]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 81221-08 for ; Wed, 1 Apr 2009 13:41:49 -0300 (ADT) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mail-ew0-f167.google.com (mail-ew0-f167.google.com [209.85.219.167]) by mail.postgresql.org (Postfix) with ESMTP id A65716318F3 for ; Wed, 1 Apr 2009 13:41:49 -0300 (ADT) Received: by ewy11 with SMTP id 11so188528ewy.19 for ; Wed, 01 Apr 2009 09:41:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=cQJ+bfH18W+6uzbK0uiFOb1hPyr6FRtHdfCngfVNcIY=; b=DL12ATItsh3ZjS3X/8VVY3TlfRX4KkD0QUoaPFOjcnW9bjhO/OCLn7vAAoHWsiV4xr wLkhenDhxUBLE/Euf7vu1q3W7/Yd7TSU29ArMG0wXqtOqF50hNCYxs9EcoY9eRc++lZW WDSP2ikz9aTHeoWQgq4TNk4oRahAvw1h9rbkI= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=xuwWJJuI8eKe0TilYnJ/HwX2E4zU3ZH01gvN8B0nhs5eeNDbD5LIvfzhjNQwEiDG6r RusYlRTdTbv12vbgjBD1FaSRwv8sRZVJuUa3DLpYsluaCsXqvhDBuuG1z9IPqcmSxHda 6bcOMeLem4uEIzteTD2yBtt2JjdRWyPuPP8bU= MIME-Version: 1.0 Received: by 10.210.142.6 with SMTP id p6mr4588737ebd.70.1238604108181; Wed, 01 Apr 2009 09:41:48 -0700 (PDT) In-Reply-To: <49D3932D.3080808@ummon.com> References: <49D31E85.8050405@paradise.net.nz> <49D37CAA.6080100@ummon.com> <49D3932D.3080808@ummon.com> Date: Wed, 1 Apr 2009 10:41:48 -0600 Message-ID: Subject: Re: Raid 10 chunksize From: Scott Marlowe To: Stef Telford Cc: Greg Smith , Mark Kirkwood , Scott Carey , "pgsql-performance@postgresql.org" Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0 tagged_above=0 required=5 tests=none X-Spam-Level: X-Archive-Number: 200904/11 X-Sequence-Number: 33378 On Wed, Apr 1, 2009 at 10:15 AM, Stef Telford wrote: > =A0 =A0 I do agree that the benefit is probably from write-caching, but I > think that this is a 'win' as long as you have a UPS or BBU adaptor, > and really, in a prod environment, not having a UPS is .. well. Crazy ? You do know that UPSes can fail, right? En masse sometimes even.