From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp2.belwue.de ([129.143.2.15]:43704 "EHLO smtp2.belwue.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751282AbbHMMVG (ORCPT ); Thu, 13 Aug 2015 08:21:06 -0400 Received: from fex.belwue.de (fex.belwue.de [129.143.4.198]) by smtp2.belwue.de with ESMTP id t7DC6wi1003121 for ; Thu, 13 Aug 2015 14:06:58 +0200 (MEST) env-from (framstag@rus.uni-stuttgart.de) Received: from fex.rus.uni-stuttgart.de (fex.rus.uni-stuttgart.de [129.69.1.129]) by fex.belwue.de (Postfix) with SMTP id EA4302036A for ; Thu, 13 Aug 2015 14:06:57 +0200 (CEST) Date: Thu, 13 Aug 2015 14:06:57 +0200 From: Ulli Horlacher To: linux-btrfs@vger.kernel.org Subject: Re: RAID0 wrong (raw) device? Message-ID: <20150813120657.GB24122@rus.uni-stuttgart.de> References: <20150812130758.GA26529@rus.uni-stuttgart.de> <55CC830D.2070304@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <55CC830D.2070304@gmail.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: On Thu 2015-08-13 (07:44), Austin S Hemmelgarn wrote: > 2. Be _VERY_ careful using BTRFS on top of _ANY_ kind of shared storage. > Most non-clustered filesystems will have issues if multiply mounted, > but in almost all cases I've personally seen, it _WILL_ cause > irreparable damage to a BTRFS filesystem (we really need to do something > like ext4's MMP in BTRFS). Same with ZFS: it has also no MMP and when you mount a shared block device twice you will destroy it irreparable. Kids, do not try this at home - I have done so ;-) -- Ullrich Horlacher Server und Virtualisierung Rechenzentrum IZUS/TIK E-Mail: horlacher@tik.uni-stuttgart.de Universitaet Stuttgart Tel: ++49-711-68565868 Allmandring 30a Fax: ++49-711-682357 70550 Stuttgart (Germany) WWW: http://www.tik.uni-stuttgart.de/ REF:<55CC830D.2070304@gmail.com>