From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from magic.merlins.org ([209.81.13.136]:58292 "EHLO mail1.merlins.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751595Ab3L3JCG (ORCPT ); Mon, 30 Dec 2013 04:02:06 -0500 Date: Mon, 30 Dec 2013 01:01:25 -0800 From: Marc MERLIN To: Kai Krakow Cc: linux-btrfs@vger.kernel.org Subject: Re: Migrate to bcache: A few questions Message-ID: <20131230090125.GN19863@merlins.org> References: <45EA1F82-A774-4729-9279-D58ACF819B05@colorremedies.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: Sender: linux-btrfs-owner@vger.kernel.org List-ID: On Mon, Dec 30, 2013 at 02:22:55AM +0100, Kai Krakow wrote: > These thought are actually quite interesting. So you are saying that data > may not be fully written to SSD although the kernel thinks so? This is That, and worse. Incidently, I have just posted on my G+ about this: https://plus.google.com/106981743284611658289/posts/Us8yjK9SPs6 which is mostly links to http://lkcl.net/reports/ssd_analysis.html https://www.usenix.org/conference/fast13/understanding-robustness-ssds-under-power-fault After you read those, you'll never think twice about SSDs and data loss anymore :-/ (I kind of found that out myself over time too, but these have much more data than I got myself empirically on a couple of SSDs) Marc -- "A mouse is a device used to point at the xterm you want to type in" - A.S.R. Microsoft is to operating systems .... .... what McDonalds is to gourmet cooking Home page: http://marc.merlins.org/ | PGP 1024R/763BE901