From owner-freebsd-fs@FreeBSD.ORG Mon Jul 11 10:12:01 2011 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id CD90C106566C for ; Mon, 11 Jul 2011 10:12:01 +0000 (UTC) (envelope-from tevans.uk@googlemail.com) Received: from mail-vx0-f182.google.com (mail-vx0-f182.google.com [209.85.220.182]) by mx1.freebsd.org (Postfix) with ESMTP id 87A5B8FC08 for ; Mon, 11 Jul 2011 10:12:01 +0000 (UTC) Received: by vxg33 with SMTP id 33so3520570vxg.13 for ; Mon, 11 Jul 2011 03:12:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; bh=eoPBnad0vFrrCoFjCdr2e97hk4kUQlJRSNyZgUG/jrI=; b=SO20DJl8XiojKP2XQJIR7JHWp3Jv7AJ+kssupUx7wkxRMNpASSLDY07QZ/QPQ19U/x CUGorkIDA8Ktn/EcP2AAYuL79EJYAAKjl7OkK8pF8qUdkft9W8kk10JbmtvLR3l6iXc6 vDJxB8RoL/ppoYGvxWqhjx+HXvszMevxAdbsc= MIME-Version: 1.0 Received: by 10.52.92.78 with SMTP id ck14mr5413890vdb.100.1310377727121; Mon, 11 Jul 2011 02:48:47 -0700 (PDT) Received: by 10.52.101.197 with HTTP; Mon, 11 Jul 2011 02:48:46 -0700 (PDT) In-Reply-To: <20110711074139.GA77617@server.vk2pj.dyndns.org> References: <1309793921.2618.YahooMailRC@web120016.mail.ne1.yahoo.com> <20110711074139.GA77617@server.vk2pj.dyndns.org> Date: Mon, 11 Jul 2011 10:48:46 +0100 Message-ID: From: Tom Evans To: Peter Jeremy Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Cc: freebsd-fs@freebsd.org Subject: Re: Are thumpers still interesting in 2011 ? (raidz3 on x4500 @ 3.0gbps ...) X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 Jul 2011 10:12:01 -0000 On Mon, Jul 11, 2011 at 8:41 AM, Peter Jeremy wrote: > On 2011-Jul-05 14:20:39 +0200, Ivan Voras wrote: >>It's a bit outdated, but here are the plans for a do-it-yourself >>slightly scaled down Thumper-like server: >> >>http://blog.backblaze.com/2009/09/01/petabytes-on-a-budget-how-to-build-c= heap-cloud-storage/ > > Note that that article doesn't address acoustic and vibration issues. > There's plenty of evidence that disks are very sensitive to vibration > - even at low levels, it will adversely impact performance. =C2=A0Designi= ng > a box to provide optimal throughput with 48 disks is going to need a > lot more attention to vibration isolation and damping than is shown. > Apart from the paragraph where they mention that they use nylon standoffs to provide vibration dampening? Cheers Tom