From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from lost.in.psyced.org ([188.40.42.221]:42638 "EHLO lo.psyced.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751186AbbH0RnT (ORCPT ); Thu, 27 Aug 2015 13:43:19 -0400 Received: from lo.psyced.org (localhost [127.0.0.1]) by lo.psyced.org (8.14.3/8.14.3/Debian-9.4) with ESMTP id t7RHWUsk030205 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Thu, 27 Aug 2015 19:32:30 +0200 Received: (from lynx@localhost) by lo.psyced.org (8.14.3/8.14.3/Submit) id t7RHWTUp030204 for linux-btrfs@vger.kernel.org; Thu, 27 Aug 2015 19:32:29 +0200 Date: Thu, 27 Aug 2015 19:32:29 +0200 From: carlo von lynX To: linux-btrfs@vger.kernel.org Subject: Impossible to mount two different copies of the same btrfs Message-ID: <20150827173229.GA30068@lo.psyced.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-btrfs-owner@vger.kernel.org List-ID: Hi there. Excuse me if I didn't subscribe the list. Just wanted to let you know of this behavior assuming you haven't noticed it yet. When mounting two copies of the same file system from two different hard disks with the intention of syncing the older with the newer one, btrfs behaves differently from ext4: it will mount the first one twice rather than mounting each. I assume it has something to do with all UUIDs being identical, which doesn't disturb ext4 though. This only happens with btrfs - I cannot mount two file systems that happen to have the same UUID (or are deemed identical by some other criterion I cannot determine). I presume this is not intended behavior. I tried relabeling one of the copies, but it didn't have any effect. Now I'm looking into ways to change the UUID. Thanks for the great snapshots however! -- E-mail is public! Talk to me in private using encryption: http://loupsycedyglgamf.onion/LynX/ irc://loupsycedyglgamf.onion:67/lynX https://psyced.org:34443/LynX/