From owner-freebsd-questions@FreeBSD.ORG Fri Dec 30 13:10:22 2011 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 6168A106566B for ; Fri, 30 Dec 2011 13:10:22 +0000 (UTC) (envelope-from m.e.sanliturk@gmail.com) Received: from mail-iy0-f182.google.com (mail-iy0-f182.google.com [209.85.210.182]) by mx1.freebsd.org (Postfix) with ESMTP id 2638E8FC21 for ; Fri, 30 Dec 2011 13:10:22 +0000 (UTC) Received: by mail-iy0-f182.google.com with SMTP id j38so32041734iad.13 for ; Fri, 30 Dec 2011 05:10:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=cakF+FhvB/HNrkRmo470zm4oE8bkJYrX6+bKmDcRxWg=; b=nRQR1JxJd+nX2+iIiW/JPbv+zaCWpupJLmrsyHT4GqrYrk3aTcAqCqRJus0WxDhFU0 n4UEVo3EuvlUTPnXTYLUrNS4oIjkQN4KzO/RwiSCXEM3luhxYRRqI2d37DbsnxjcCEwl gaGOBmnaXMimkC/A4gdZ+GVOBs+wWOYGJJtv0= MIME-Version: 1.0 Received: by 10.50.168.70 with SMTP id zu6mr34541807igb.13.1325250621955; Fri, 30 Dec 2011 05:10:21 -0800 (PST) Received: by 10.42.168.137 with HTTP; Fri, 30 Dec 2011 05:10:21 -0800 (PST) In-Reply-To: <1325229204.34713.YahooMailNeo@web140405.mail.bf1.yahoo.com> References: <1325229204.34713.YahooMailNeo@web140405.mail.bf1.yahoo.com> Date: Fri, 30 Dec 2011 08:10:21 -0500 Message-ID: From: Mehmet Erol Sanliturk To: UFS User Content-Type: text/plain; charset=UTF-8 X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: "freebsd-questions@freebsd.org" Subject: Re: Why do I feel like compact flash is more reliable than SSD ? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Dec 2011 13:10:22 -0000 On Fri, Dec 30, 2011 at 2:13 AM, UFS User wrote: > I have run a lot of different FreeBSD systems off (fileservers, firewalls, > routers, etc.) off of compact flash cards[1] and have never had a CF part > fail. > > Most of these were read-only mode, but some of them were left mounted 'rw' > for years (with no swapping, of course). The bottom line is, they never > failed, and some were (and are) in the field for over 8 years now. > > But everyone I know (including me) has had an SSD fail, usually with no > explanation. > > So is this just chance, or ... are CF cards really a lot more reliable > than SSD ? > > It's sloppy, but I never once considered mirroring my CF boot devices, and > now in 2011 I am actually buying two *different* SSDs to put into a boot > mirror > because I am afraid of mirroring identical ones and they both die at > identical times. > > Comments ? > > > > [1] Plain old store-bough Sandisk parts - so a good brand, but nothing > special > > The following pages , and references in them , may be useful : http://en.wikipedia.org/wiki/Solid-state_drive http://en.wikipedia.org/wiki/Wear_leveling http://en.wikipedia.org/wiki/Write_amplification http://en.wikipedia.org/wiki/Category:Solid-state_computer_storage_media http://en.wikipedia.org/wiki/Category:Solid-state_computer_storage Thank you very much . Mehmet Erol Sanliturk