Received: from maia.hub.org (maia-2.hub.org [200.46.204.251]) by mail.postgresql.org (Postfix) with ESMTP id C9D70B5DBE1 for ; Tue, 21 Jun 2011 08:19:51 -0300 (ADT) Received: from mail.postgresql.org ([200.46.204.86]) by maia.hub.org (mx1.hub.org [200.46.204.251]) (amavisd-maia, port 10024) with ESMTP id 46642-09 for ; Tue, 21 Jun 2011 11:19:45 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from mx01.bfk.de (mx01.bfk.de [193.227.124.2]) by mail.postgresql.org (Postfix) with ESMTP id 7A50EB5D94C for ; Tue, 21 Jun 2011 08:19:45 -0300 (ADT) Received: from mx00.int.bfk.de ([10.119.110.2]) by mx01.bfk.de with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) id 1QYyzf-00024m-FR; Tue, 21 Jun 2011 11:19:43 +0000 Received: by bfk.de with local id 1QYyzf-0003Ja-9p; Tue, 21 Jun 2011 11:19:43 +0000 From: Florian Weimer To: Yeb Havinga Cc: Greg Smith , pgsql-performance@postgresql.org Subject: Re: Contemplating SSD Hardware RAID References: <4E0015F2.9060504@drivefaster.net> <4E003B44.9090005@2ndQuadrant.com> <4E004D96.7010308@gmail.com> <4E004E74.5020209@gmail.com> Date: Tue, 21 Jun 2011 11:19:43 +0000 In-Reply-To: <4E004E74.5020209@gmail.com> (Yeb Havinga's message of "Tue, 21 Jun 2011 09:55:32 +0200") Message-ID: <82d3i777ow.fsf@mid.bfk.de> MIME-Version: 1.0 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=-1.91 tagged_above=-10 required=5 tests=BAYES_00=-1.9, T_RP_MATCHES_RCVD=-0.01 X-Spam-Level: X-Archive-Number: 201106/197 X-Sequence-Number: 44130 * Yeb Havinga: > I forgot to mention that with an SSD it's important to watch the > remaining lifetime. These values can be read with smartctl. When > putting the disk behind a hardware raid controller, you might not be > able to read them from the OS, and the hardware RAID firmware might be > to old to not know about the SSD lifetime indicator or not even show > it. 3ware controllers offer SMART pass-through, and smartctl supports it. I'm sure there's something similar for Areca controllers. --=20 Florian Weimer BFK edv-consulting GmbH http://www.bfk.de/ Kriegsstra=DFe 100 tel: +49-721-96201-1 D-76133 Karlsruhe fax: +49-721-96201-99